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AMD Ryzen 9 3900 Review | 78 Data compared

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  • Avg. price in UK: ~£150
  • Avg. price in US: ~$220
  • PassMark benchmark result: 30612
  • N. of physical cores: 12
  • CPU boost clock speed: 4.3 GHz

AMD Ryzen 9 3900 review. Compare 78 technical specifications and user reviews to see how it ranks among processors and if it is worth buying.

6.3

Overall score

What it is: An overall evaluation of the processor's quality, based on technical analyses and user reviews.

When it matters: When you need a quick reference to identify the best processors on the market.

Score components:

90.0%

6.3

Technical Score

10.0%

?

User score

Good
6.3

Technical Score

What it is: An assessment of the processor's technical performance, covering key areas such as processing performance, core configuration, efficiency, platform support, integrated features, and thermal behavior.

When it matters: When you want to compare processors based on technical performance and available features.

Score components:

60.0%

5.6

Performance

18.0%

7.4

Cache & Architecture

10.0%

7.4

Memory & PCIe

7.0%

7.4

Power & Thermal

4.0%

8.5

Platform

1.0%

2.8

Integrated Graphics

Good
?

User score

What it is: A rating that combines user reviews and the total number of reviews received by the processor.

When it matters: When you want to know how a processor performs in real workloads and how reliable it is for gaming, productivity, and efficiency according to user feedback.

Score components:

70.0%

?

User reviews

30.0%

?

Popularity

  • 5.7
    Gaming

    Score components:

    30.0%

    4.4

    PassMark single-core benchmark score

    25.0%

    4.8

    Geekbench 6 single-core benchmark score

    20.0%

    5.5

    CPU boost clock speed

    17.0%

    10

    L3 cache

    8.0%

    5.1

    N. of physical cores

  • 6.1
    Video editing

    Score components:

    45.0%

    4.6

    Geekbench 6 multi-core benchmark score

    20.0%

    5.1

    N. of physical cores

    20.0%

    7.6

    CPU threads

    15.0%

    10

    L3 cache

  • No image
No image

Best prices in UK

    N/A~ £150

Best rankings

?

Available: ranking among products currently available (including other versions of this product).
All: ranking among all products in the database.

Verdict

The AMD Ryzen 9 3900 is an OEM-exclusive, 12-core, 24-thread desktop processor built on the 7nm Zen 2 architecture, featuring a 3.1 GHz base clock, a 4.3 GHz max boost, and a massive 64MB of L3 cache. Its primary advantage is exceptional power efficiency with a low 65W TDP, making it a cooler-running and highly capable multitasking unit that rivals the performance of the 105W 3900X in heavy multi-threaded workloads. However, its main drawbacks include a lack of integrated graphics, lower single-core performance compared to its 'X' series counterparts and Intel rivals, and the fact that it was primarily limited to pre-built systems rather than the retail DIY market.

Technical Specifications of processor AMD Ryzen 9 3900

Technical Score

What it is: An assessment of the processor's technical performance, covering key areas such as processing performance, core configuration, efficiency, platform support, integrated features, and thermal behavior.

When it matters: When you want to compare processors based on technical performance and available features.

Score components:

60.0%

?

Performance

18.0%

?

Cache & Architecture

10.0%

?

Memory & PCIe

7.0%

?

Power & Thermal

4.0%

?

Platform

1.0%

?

Integrated Graphics

6.3
AMD Ryzen 9 3900 has a technical score of 6.31 points, which is higher than that of 69.8% of products in this category.
User score

What it is: A rating that combines user reviews and the total number of reviews received by the processor.

When it matters: When you want to know how a processor performs in real workloads and how reliable it is for gaming, productivity, and efficiency according to user feedback.

Score components:

70.0%

0.0

User reviews

30.0%

1.0

Popularity

?
Popularity
What it is: An indicator based on the number of reviews received by the processor.
When it matters: When you prefer to choose a processor reviewed and selected by many other buyers.
1.0
AMD Ryzen 9 3900 has a popularity of 1 points, which is higher than 0% of products in this category.
Ratio quality/price

What it is: An indicator that combines the processor's overall rating with its cost.

When it matters: When you are looking for a processor with a good balance between performance, efficiency, and price.

Score components:

60.0%

6.3

Overall score

40.0%

9.7

Price

7.3
AMD Ryzen 9 3900 has a quality-to-price ratio of 7.3 points, which is higher than 79.4% of products in this category.
Brand name
What it is: The manufacturer or brand of the product.
When it matters: When you prefer a specific ecosystem, support network, or design philosophy.

Importance: MEDIUM

AMD
Processor type
What it is: The kind of system the processor is built for, such as desktop PCs, laptops, workstations, or servers.
When it matters: When you want a processor meant for the kind of machine you are actually building or buying, rather than a chip aimed at a different class of system.

Importance: HIGH

desktop
AMD Ryzen 9 3900 belongs to the desktop processor class, which is more advanced than that of 56% of processors and equal to that of 37.9% of processors.
CPU socket
What it is: The physical socket the processor fits into on the motherboard.
When it matters: When you need to make sure the CPU can actually be installed on a specific motherboard.

Importance: HIGH

AM4
AMD Ryzen 9 3900 uses the AM4 CPU socket, which is newer than that of 76.3% of processors and equal to that of 9.7% of processors.
Chipset
What it is: The motherboard chipset families officially meant to work with the processor.
When it matters: When you are checking whether a CPU will work with the motherboard features and platform you plan to use.

Importance: HIGH

X570, B550, A520, X470, B450, X370, B350, A320
AMD Ryzen 9 3900 supports X570, B550, A520, X470, B450, X370, B350, A320 chipsets, which is broader compatibility than 73.8% of processors and equal to that of 4.5% of processors.
CPU architecture
What it is: The processor family or design generation behind the chip, such as Zen 4 or Raptor Lake.
When it matters: When you are comparing CPUs across generations and want a clearer sense of their design age, feature level, and expected performance class.

Importance: HIGH

x86-64
AMD Ryzen 9 3900 uses the x86-64 architecture, which is more advanced than that of 1.7% of processors and equal to that of 98.3% of processors.
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N. of physical cores
What it is: The number of physical CPU cores on the processor.
When it matters: When you run workloads that benefit from more real cores.

Importance: HIGH

Good value: 8+

12
AMD Ryzen 9 3900 has 12 CPU cores, which is more than 81.5% of processors and equal to 5.5% of processors.
CPU threads
What it is: The total number of processing threads the CPU can handle at once.
When it matters: When you run heavily threaded workloads or multitask a lot.

Importance: HIGH

Good value: 16+

24
AMD Ryzen 9 3900 offers 24 CPU threads, which is more than 90.3% of processors and equal to 4% of processors.
Threads per core
What it is: The number of threads each physical core can handle at once.
When it matters: When you want to understand how much thread-level parallelism each core can provide in multitasking or heavily threaded work.

Importance: MEDIUM

Good value: 2

2
AMD Ryzen 9 3900 offers 2 threads per core, which is more than 30.4% of processors and equal to 69.6% of processors.
CPU boost clock speed
What it is: The highest clock speed the processor can reach under boost conditions.
When it matters: When you care about peak speed in short bursts.

Importance: HIGH

Good value: >4.7 GHz

4.3 GHz
AMD Ryzen 9 3900 reaches a boost clock of 4.3 GHz which is higher than that of 48.2% of processors and equal to that of 2.9% of processors.
CPU base clock speed
What it is: The processor's normal all-core starting frequency before boost behavior raises clocks temporarily.
When it matters: When you care about steadier performance in longer workloads rather than short burst speed alone.

Importance: MEDIUM

12 x 3.1 GHz
AMD Ryzen 9 3900 has a base clock of 12x3.1 GHz which is equal to that of 100% of processors.
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Semiconductor size
What it is: The manufacturing process node used to produce the processor, usually expressed in nanometers.
When it matters: When efficiency, heat, and the relative modernity of the chip-making process matter to your comparison.

Importance: HIGH

Good value: <10 nm

7 nm
AMD Ryzen 9 3900 uses a 7 nm process node, which is more advanced than that of 71.5% of processors and equal to that of 10.9% of processors.
Foundry
What it is: The semiconductor manufacturer that physically fabricates the processor chip.
When it matters: When process source, manufacturing generation, or foundry differences matter to your comparison more than day-to-day performance alone.

Importance: MEDIUM

TSMC 7 nm
AMD Ryzen 9 3900 is built on the TSMC 7 nm foundry process, which is more advanced than that of 56.7% of processors and equal to that of 9.4% of processors.
L3 cache
What it is: The total amount of L3 cache available on the processor.
When it matters: When you want better performance in cache-sensitive workloads and games.

Importance: MEDIUM

Good value: >=16 MB

64 MB
AMD Ryzen 9 3900 has an L3 cache of 64 MB which is larger than that of 94.6% of processors and equal to that of 2.8% of processors.
L2 cache
What it is: The total amount of L2 cache available across the processor.
When it matters: When you want to compare CPU design efficiency and how much fast intermediate cache the cores have available.

Importance: MEDIUM

Good value: >=6 MB

6 MB
AMD Ryzen 9 3900 has an L2 cache of 6 MB which is larger than that of 67% of processors and equal to that of 4% of processors.
L1 cache
What it is: The total amount of L1 cache built into the processor, which sits closest to the cores.
When it matters: When you are comparing low-level CPU design details rather than the broader performance picture buyers usually notice first.

Importance: MEDIUM

Good value: >=512 KB

768 KB
AMD Ryzen 9 3900 has an L1 cache of 768 KB which is larger than that of 78.2% of processors and equal to that of 3.4% of processors.
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DDR memory version
What it is: The RAM generation the processor is designed to support, such as DDR4 or DDR5.
When it matters: When you need the CPU to match the kind of memory platform you want to buy or reuse.

Importance: MEDIUM

Good value: DDR5

DDR4
AMD Ryzen 9 3900 supports DDR DDR4, which is newer than that of 26.3% of processors and equal to that of 31.7% of processors.
Maximum memory speed
What it is: The highest official memory speed supported by the processor.
When it matters: When you choose RAM and want to know the supported speed ceiling.

Importance: HIGH

Good value: >=4800 MHz

3,200 MHz
AMD Ryzen 9 3900 supports memory speeds up to 3200 MHz, which is higher than that of 51.5% of processors and equal to 8.3% of processors.
Max memory speed (JEDEC)
What it is: The highest official RAM speed the processor supports under standard JEDEC settings, before any memory overclocking profiles are applied.
When it matters: When officially supported stock RAM speed matters more than XMP, EXPO, or manual memory tuning.

Importance: MEDIUM

Good value: >=5600 MHz

DDR4-3200 MHz
AMD Ryzen 9 3900 supports JEDEC memory speeds up to DDR4-3200 MHz, which is higher than that of 51.1% of processors and equal to 8.4% of processors.
Max memory speed (XMP / EXPO)
What it is: The highest memory speed supported through XMP or EXPO profiles.
When it matters: When you want faster RAM through memory profiles.

Importance: MEDIUM

Good value: >=5200 MHz

?
Maximum memory capacity
What it is: The largest total amount of memory officially supported by the processor.
When it matters: When you plan a system with very large RAM capacity.

Importance: HIGH

Good value: >=128 GB

128 GB
AMD Ryzen 9 3900 supports up to 128 GB of memory, which is more than 61.9% of processors and equal to 21.4% of processors.
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Integrated graphics
What it is: Includes built-in graphics, so the system can output video without a separate graphics card.
When it matters: When you want the PC to work without a dedicated GPU, or you are building an office, media, compact, or troubleshooting-friendly system.

Importance: HIGH

no
AMD Ryzen 9 3900 does not include integrated graphics. 87.6% of processors include integrated graphics.
Integrated GPU model
What it is: The model name of the integrated graphics processor, if present.
When it matters: When you plan to use the CPU's built-in graphics.

Importance: MEDIUM

N/A
Integrated GPU execution units
What it is: The number of execution units available in the integrated graphics part of the processor.
When it matters: When you plan to rely on built-in graphics and want a better sense of its light gaming, display, or media capability.

Importance: MEDIUM

Good value: >=24

N/A
Integrated GPU base frequency
What it is: The base operating frequency of the integrated GPU.
When it matters: When integrated graphics performance matters to you.

Importance: MEDIUM

Good value: >=350 MHz

N/A
Integrated media encoders/decoders
What it is: The hardware media formats the processor can encode or decode directly.
When it matters: When you stream, edit video, or rely on hardware media acceleration.

Importance: LOW

N/A
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TDP (Thermal design power)
What it is: The rated thermal design power, which gives a general idea of cooling and power needs.
When it matters: When you choose a cooler or build in a tighter case.

Importance: HIGH

Good value: <30 W

65 W
AMD Ryzen 9 3900 has a TDP of 65 W which is higher than that of 70% of processors and equal to that of 16.1% of processors.
Base power (PL1)
What it is: The sustained power target used for longer CPU loads.
When it matters: When you choose cooling and power delivery for sustained workloads.

Importance: MEDIUM

Good value: <30 W

65 W
AMD Ryzen 9 3900 has a base power of 65 W which is higher than that of 70.3% of processors and equal to that of 16.4% of processors.
Boost power (PL2)
What it is: The short-term boost power limit the processor may draw under heavier turbo loads.
When it matters: When you size cooling and power delivery for peak turbo behavior.

Importance: MEDIUM

Good value: <50 W

88 W
AMD Ryzen 9 3900 has a boost power of 88 W which is higher than that of 57.6% of processors and equal to that of 6.3% of processors.
Tau (power duration limit)
What it is: The time limit the CPU can stay at higher boost power before dropping toward sustained power.
When it matters: When you want to understand turbo behavior under longer loads.

Importance: MEDIUM

Good value: <=28 s

N/A
Configurable TDP
What it is: Allows the processor to run in alternate power modes instead of being fixed to one default TDP target.
When it matters: When you want more control over heat, noise, and power draw in compact systems, quieter builds, or thermally limited machines.

Importance: LOW

yes
AMD Ryzen 9 3900 supports configurable TDP. 52.9% of processors support configurable TDP.
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AMD Ryzen 9 3900 vs the average processor

  • 8x larger L3 cache
    AMD Ryzen 9 3900 has a higher L3 cache than the average processor (64 MB vs 8 MB). The average processor has L3 cache of 8 MB.
    What it is: The total amount of L3 cache available on the processor.
    When it matters: When you want better performance in cache-sensitive workloads and games.

    Importance: MEDIUM

    Good value: >=16 MB

    AMD Ryzen 9 3900 has a higher L3 cache than the average processor (64 MB vs 8 MB). The average processor has L3 cache of 8 MB.64 MB vs 8 MB
  • 16 more CPU threads
    AMD Ryzen 9 3900 has more CPU threads than the average processor (24 vs 8). The average processor has 8 CPU threads.
    What it is: The total number of processing threads the CPU can handle at once.
    When it matters: When you run heavily threaded workloads or multitask a lot.

    Importance: HIGH

    Good value: 16+

    AMD Ryzen 9 3900 has more CPU threads than the average processor (24 vs 8). The average processor has 8 CPU threads.24 vs 8
  • 2.91x higher PassMark score
    AMD Ryzen 9 3900 has a higher PassMark benchmark score than the average processor (30,612 vs 10,532.5). The average processor scores 10,532.5 in PassMark benchmark.
    What it is: A benchmark score that gives a broad idea of overall processor performance.
    When it matters: When you want a quick overall performance comparison.

    Importance: HIGH

    Good value: >19000

    AMD Ryzen 9 3900 has a higher PassMark benchmark score than the average processor (30,612 vs 10,532.5). The average processor scores 10,532.5 in PassMark benchmark.30,612 vs 10,532.5
  • 6 more CPU cores
    AMD Ryzen 9 3900 has more CPU cores than the average processor (12 vs 6). The average processor has 6 CPU cores.
    What it is: The number of physical CPU cores on the processor.
    When it matters: When you run workloads that benefit from more real cores.

    Importance: HIGH

    Good value: 8+

    AMD Ryzen 9 3900 has more CPU cores than the average processor (12 vs 6). The average processor has 6 CPU cores.12 vs 6
  • Unlocked for overclocking
    AMD Ryzen 9 3900 has an unlocked multiplier, the average processor does not.
    What it is: Has an unlocked CPU multiplier, which makes manual CPU overclocking much easier on supported platforms.
    When it matters: When you plan to push clock speeds beyond stock settings instead of leaving the processor completely at default behavior.

    Importance: MEDIUM

    AMD Ryzen 9 3900 has an unlocked multiplier, the average processor does not.
  • 8 more PCIe lanes
    AMD Ryzen 9 3900 has more PCIe lanes than the average processor (24 vs 16). The average processor offers 16 PCIe lanes.
    20 usable lanes
    What it is: The number of PCIe lanes provided directly by the processor.
    When it matters: When you connect fast GPUs, SSDs, or expansion cards.

    Importance: HIGH

    Good value: >=20

    AMD Ryzen 9 3900 has more PCIe lanes than the average processor (24 vs 16). The average processor offers 16 PCIe lanes.24 vs 16
  • 3.11x more L3 per core
    AMD Ryzen 9 3900 has more L3 cache per core than the average processor (5.3 MB/core vs 1.714 MB/core). The average processor provides 1.714 MB/core of L3 cache per core.
    What it is: The amount of L3 cache effectively available per CPU core.
    When it matters: When you are comparing how much shared cache each core can draw on in deeper technical analysis.

    Importance: MEDIUM

    Good value: >=2 MB/core

    AMD Ryzen 9 3900 has more L3 cache per core than the average processor (5.3 MB/core vs 1.714 MB/core). The average processor provides 1.714 MB/core of L3 cache per core.5.33 MB/core vs 1.714 MB/core
  • 97.9% higher multi-core score
    AMD Ryzen 9 3900 has a higher Geekbench 6 multi-core score than the average processor (9,485 vs 4,793). The average processor scores 4,793 in Geekbench 6 multi-core.
    What it is: A Geekbench 6 score that reflects multi-core CPU performance in mixed modern workloads.
    When it matters: When you want a quick picture of multi-core speed in everyday mixed workloads, multitasking, and broadly optimized software.

    Importance: HIGH

    Good value: >8500

    AMD Ryzen 9 3900 has a higher Geekbench 6 multi-core score than the average processor (9,485 vs 4,793). The average processor scores 4,793 in Geekbench 6 multi-core.9,485 vs 4,793
  • Modern CPU socket
    AMD Ryzen 9 3900 uses a more modern CPU socket than the average processor (AM4 vs FP2).
  • 16 more CPU threads
    AMD Ryzen 9 3900 has more CPU threads than the average processor (24 vs 8). The average processor has 8 CPU threads.
  • 2.91x higher PassMark score
    AMD Ryzen 9 3900 has a higher PassMark benchmark score than the average processor (30,612 vs 10,532.5). The average processor scores 10,532.5 in PassMark benchmark.
  • 6 more CPU cores
    AMD Ryzen 9 3900 has more CPU cores than the average processor (12 vs 6). The average processor has 6 CPU cores.
  • Unlocked for overclocking
    AMD Ryzen 9 3900 has an unlocked multiplier, the average processor does not.
  • 97.9% higher multi-core score
    AMD Ryzen 9 3900 has a higher Geekbench 6 multi-core score than the average processor (9,485 vs 4,793). The average processor scores 4,793 in Geekbench 6 multi-core.
  • 13.4% higher single-core score
    AMD Ryzen 9 3900 has a higher Geekbench 6 single-core score than the average processor (1,668 vs 1,471). The average processor scores 1,471 in Geekbench 6 single-core.
  • 8x larger L3 cache
    AMD Ryzen 9 3900 has a higher L3 cache than the average processor (64 MB vs 8 MB). The average processor has L3 cache of 8 MB.
  • 3.11x more L3 per core
    AMD Ryzen 9 3900 has more L3 cache per core than the average processor (5.3 MB/core vs 1.714 MB/core). The average processor provides 1.714 MB/core of L3 cache per core.
  • 41.7% smaller process node
    AMD Ryzen 9 3900 has a lower process node than the average processor (7 nm vs 12 nm). The average processor uses a process node of 12 nm.
  • 2.4x larger L2 cache
    AMD Ryzen 9 3900 has a higher L2 cache than the average processor (6 MB vs 2.5 MB). The average processor has L2 cache of 2.5 MB.
  • 2x larger L1 cache
    AMD Ryzen 9 3900 has a higher L1 cache than the average processor (768 KB vs 384 KB). The average processor has L1 cache of 384 KB.
  • More advanced foundry
    AMD Ryzen 9 3900 uses a more advanced foundry process than the average processor (TSMC 7 nm vs Intel 14 nm).
  • More advanced microarchitecture
    AMD Ryzen 9 3900 uses a more advanced microarchitecture than the average processor (Matisse vs Kaby Lake).
  • 8 more PCIe lanes
    AMD Ryzen 9 3900 has more PCIe lanes than the average processor (24 vs 16). The average processor offers 16 PCIe lanes.
  • Newer PCIe version
    AMD Ryzen 9 3900 supports a newer PCIe version than the average processor (4 vs 3.0).
  • Supports memory overclocking
    AMD Ryzen 9 3900 supports memory overclocking, the average processor does not.
  • 2x more memory capacity
    AMD Ryzen 9 3900 has more maximum memory capacity than the average processor (128 GB vs 64 GB). The average processor supports 64 GB of memory.
  • Supports ECC memory
    AMD Ryzen 9 3900 supports ECC memory, the average processor does not.
  • Includes stock cooler
    AMD Ryzen 9 3900 includes a stock cooler, the average processor does not.
  • 5 °C lower CPU temperature
    AMD Ryzen 9 3900 has a lower CPU temperature than the average processor (95 °C vs 100 °C). The average processor runs at a CPU temperature of 100 °C.

Total
Platform
Performance
Cache & Architecture
Memory & PCIe
Power & Thermal
  • Older TPM support
    AMD Ryzen 9 3900 supports an older TPM version than the average processor (fTPM 2.0 vs PTT 2.0).
  • 60.1% slower Blender rendering
    AMD Ryzen 9 3900 has a higher Blender BMW27 render time than the average processor (132.5 vs 331.88). The average processor needs 331.88 for the Blender BMW27 test.
  • 43.6% slower classroom rendering
    AMD Ryzen 9 3900 has a higher Blender Classroom render time than the average processor (446.6 vs 791.745). The average processor needs 791.745 for the Blender Classroom test.
  • No integrated graphics
    AMD Ryzen 9 3900 does not include integrated graphics, the average processor does.
  • 44.4% higher base power
    AMD Ryzen 9 3900 has a higher base power draw than the average processor (65 W vs 45 W). The average processor has a base power draw of 45 W.
  • 5 °C lower TJ Max
    AMD Ryzen 9 3900 has a lower TJ Max than the average processor (95 °C vs 100 °C). The average processor has a TJ Max of 100 °C.
  • 44.4% higher TDP
    AMD Ryzen 9 3900 has a higher TDP than the average processor (65 W vs 45 W). The average processor has a TDP of 45 W.
  • 37.5% higher boost power
    AMD Ryzen 9 3900 has a higher boost power draw than the average processor (88 W vs 64 W). The average processor has a boost power draw of 64 W.
  • 60.1% slower Blender rendering
    AMD Ryzen 9 3900 has a higher Blender BMW27 render time than the average processor (132.5 vs 331.88). The average processor needs 331.88 for the Blender BMW27 test.
    What it is: A Blender render result based on the BMW27 scene, used to show how quickly the processor can finish a heavy 3D rendering task.
    When it matters: When rendering speed matters for 3D work, content creation, or other workloads that behave like long multi-core renders.

    Importance: HIGH

    Good value: >290

    AMD Ryzen 9 3900 has a higher Blender BMW27 render time than the average processor (132.5 vs 331.88). The average processor needs 331.88 for the Blender BMW27 test.132.5 vs 331.88
  • 44.4% higher base power
    AMD Ryzen 9 3900 has a higher base power draw than the average processor (65 W vs 45 W). The average processor has a base power draw of 45 W.
    What it is: The sustained power target used for longer CPU loads.
    When it matters: When you choose cooling and power delivery for sustained workloads.

    Importance: MEDIUM

    Good value: <30 W

    AMD Ryzen 9 3900 has a higher base power draw than the average processor (65 W vs 45 W). The average processor has a base power draw of 45 W.65 W vs 45 W
  • 43.6% slower classroom rendering
    AMD Ryzen 9 3900 has a higher Blender Classroom render time than the average processor (446.6 vs 791.745). The average processor needs 791.745 for the Blender Classroom test.
    What it is: A Blender render result based on the Classroom scene, used to show how quickly the processor can complete a demanding rendering workload.
    When it matters: When rendering speed matters for 3D work, content creation, or other workloads that behave like long multi-core renders.

    Importance: HIGH

    Good value: >1500

    AMD Ryzen 9 3900 has a higher Blender Classroom render time than the average processor (446.6 vs 791.745). The average processor needs 791.745 for the Blender Classroom test.446.6 vs 791.745
  • 5 °C lower TJ Max
    AMD Ryzen 9 3900 has a lower TJ Max than the average processor (95 °C vs 100 °C). The average processor has a TJ Max of 100 °C.
    What it is: The highest safe operating junction temperature before the CPU starts throttling or protecting itself.
    When it matters: When you tune cooling or monitor thermals under load.

    Importance: LOW

    Good value: >=100 °C

    AMD Ryzen 9 3900 has a lower TJ Max than the average processor (95 °C vs 100 °C). The average processor has a TJ Max of 100 °C.95 °C vs 100 °C
  • No integrated graphics
    AMD Ryzen 9 3900 does not include integrated graphics, the average processor does.
    What it is: Includes built-in graphics, so the system can output video without a separate graphics card.
    When it matters: When you want the PC to work without a dedicated GPU, or you are building an office, media, compact, or troubleshooting-friendly system.

    Importance: HIGH

    AMD Ryzen 9 3900 does not include integrated graphics, the average processor does.
  • 44.4% higher TDP
    AMD Ryzen 9 3900 has a higher TDP than the average processor (65 W vs 45 W). The average processor has a TDP of 45 W.
    What it is: The rated thermal design power, which gives a general idea of cooling and power needs.
    When it matters: When you choose a cooler or build in a tighter case.

    Importance: HIGH

    Good value: <30 W

    AMD Ryzen 9 3900 has a higher TDP than the average processor (65 W vs 45 W). The average processor has a TDP of 45 W.65 W vs 45 W
  • 37.5% higher boost power
    AMD Ryzen 9 3900 has a higher boost power draw than the average processor (88 W vs 64 W). The average processor has a boost power draw of 64 W.
    What it is: The short-term boost power limit the processor may draw under heavier turbo loads.
    When it matters: When you size cooling and power delivery for peak turbo behavior.

    Importance: MEDIUM

    Good value: <50 W

    AMD Ryzen 9 3900 has a higher boost power draw than the average processor (88 W vs 64 W). The average processor has a boost power draw of 64 W.88 W vs 64 W
  • Older TPM support
    AMD Ryzen 9 3900 supports an older TPM version than the average processor (fTPM 2.0 vs PTT 2.0).
    What it is: The kind of TPM security support associated with the processor or its platform.
    When it matters: When operating-system requirements, device encryption, enterprise security, or platform trust features matter.

    Importance: LOW

    AMD Ryzen 9 3900 supports an older TPM version than the average processor (fTPM 2.0 vs PTT 2.0).fTPM 2.0 vs PTT 2.0
Total
Platform
Performance
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Graphic comparison of AMD Ryzen 9 3900 and other processors

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Third-party reviews

What customers like about AMD Ryzen 9 3900?

  • High core count (12 cores, 24 threads) provides excellent multi-threaded performance for productivity and content creation tasks
  • Superior power efficiency with a 65W TDP, making it ideal for small form factor (SFF) builds and cooler operation
  • Real-world performance in multi-threaded workloads is remarkably close to the higher-powered Ryzen 9 3900X
  • Large L3 cache (64MB) helps mitigate memory latency and improves overall system responsiveness
  • Compatible with the established AM4 socket and supports PCIe 4.0 for faster storage and GPU bandwidth
  • Lower power draw allows for use with less expensive motherboards that have standard power delivery systems

What customers dislike about AMD Ryzen 9 3900?

  • Limited retail availability as it was primarily intended for OEM system builders and pre-built PCs
  • Lower base and boost clock speeds compared to the 3900X can result in slightly slower performance in frequency-dependent apps
  • Single-core performance and 1080p gaming frame rates generally trail behind competing Intel high-end processors
  • Lack of integrated graphics requires the additional purchase of a dedicated video card
  • Actual power draw under heavy load can exceed the 65W rating, reaching closer to 90W in some scenarios
  • May be considered a niche product for DIY enthusiasts compared to more widely available 'X' or 'XT' variants

Expert reviews

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tomshardware.com
04/10/2019
AMD Ryzen 9 3900 Tested: Unreleased 65W Processor Sets World Records

The Tom’s Hardware review examines the unreleased 12-core, 24-thread AMD Ryzen 9 3900, a 65W processor designed for OEM systems, which achieved world-record overclocking speeds of 5.5 GHz under liquid nitrogen. It acts as a high-quality, binned alternative to the 105W Ryzen 9 3900X, offering similar performance potential with greater power efficiency. A key pro is the superior...Read more

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hardwarecanucks.com
28/08/2020
The Best CPU You CAN’T Buy - Ryzen 9 3900 Performance Review

The Hardware Canucks review highlights the AMD Ryzen 9 3900 as a highly efficient, 12-core "hidden gem" that delivers 3900X-level performance at a much lower power draw, making it ideal for small form factor (SFF) builds. While officially rated at 65W TDP, the CPU draws closer to 90W under load, yet remains roughly 100W more efficient than competing high-end Intel processors. The...Read more

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tomshardware.com
12/11/2019
AMD Ryzen 9 3900 Review: a Taste of Eco Mode

The Tom's Hardware review of the AMD Ryzen 9 3900 highlights this 12-core/24-thread CPU as a power-efficient alternative to the 3900X, operating at a 65W TDP through lower base (3.1 GHz) and boost (4.3 GHz) clocks. While technically an OEM-only part, it demonstrates the efficacy of Eco-Mode, providing significant power savings (up to 44% lower) and lower thermal output, making it...Read more

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planet3dnow.de
04/10/2019
AMD Ryzen 9 3900: 12-core with 65W TDP reviewed and nearing launch

The Planet 3DNow! review identifies the 12-core AMD Ryzen 9 3900 (non-X) as a high-efficiency alternative to the 3900X, operating at a 65W TDP specifically for OEM markets. With 12 cores, 24 threads, and a 3.1 GHz base clock, it provides nearly 90% of the multi-threaded performance of the 105W model while offering 15-20°C cooler operation and an unlocked multiplier for performance...Read more

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tomshardware.fr
04/10/2019
AMD Ryzen 9 3900 65W TDP review: hitting 160W under full load

The AMD Ryzen 9 3900 is a 12-core, 24-thread processor designed for a 65W TDP, delivering performance very close to the 105W Ryzen 9 3900X despite lower base (3.1 GHz) and boost (4.3 GHz) clocks. Its high efficiency makes it ideal for small form factor (SFF) builds, effectively serving as an "Eco Mode" version of the Zen 2 architecture, with multi-threaded performance trailing the...Read more

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pcgaming.tech
13/02/2020
How many cores do you need for gaming? (Ryzen 9 3900 / 3900X analysis)

According to PcGaming.Tech, the optimal CPU core count for modern gaming is 6 to 8, as high-frequency performance and 3D V-Cache offer better results than sheer core volume. Six cores provide the best value, while eight cores offer future-proofing for multitasking. Pros include cost-efficient, high-performance gaming that avoids diminishing returns on 12+ core processors....Read more

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tomshw.it
04/10/2019
AMD Ryzen 9 3900 Preview: A Record-Breaking CPU for Overclocking

The AMD Ryzen 9 3900, a 65W, 12-core/24-thread OEM processor, achieved world records by being overclocked to 5.5 GHz on all cores using liquid nitrogen, despite its low 3.1 GHz base clock. With a 70MB cache, this efficient chip offers nearly 90% of the 3900X's stock performance while drawing less power, making it a "hidden gem" for compact, high-performance systems. While offering...Read more

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