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Intel Core i5 8400T Review | 78 Data compared

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  • Avg. price: ~£60
  • PassMark benchmark result: 7417
  • N. of physical cores: 6
  • CPU boost clock speed: 3.3 GHz

Intel Core i5 8400T review. Compare 78 technical specifications and user reviews to see how it ranks among processors and if it is worth buying.

4.8

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%

4.5

Technical Score

10.0%

7.6

User score

Poor
4.5

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%

3.7

Performance

18.0%

4.9

Cache & Architecture

10.0%

5.2

Memory & PCIe

7.0%

7.1

Power & Thermal

4.0%

7.9

Platform

1.0%

6.9

Integrated Graphics

Poor
7.6

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%

9.7

User reviews

30.0%

2.5

Popularity

User score:
United Kingdom
amazon
4.8
(11)
amazon
5.0
(3)
amazon
5.0
(1)

(Reviews last updated: May 2026)

Very good
  • 2.7
    Gaming

    Score components:

    30.0%

    2.8

    PassMark single-core benchmark score

    25.0%

    3.1

    Geekbench 6 single-core benchmark score

    20.0%

    2.5

    CPU boost clock speed

    17.0%

    2.3

    L3 cache

    8.0%

    2.6

    N. of physical cores

  • 2.4
    Video editing

    Score components:

    45.0%

    2.4

    Geekbench 6 multi-core benchmark score

    20.0%

    2.6

    N. of physical cores

    20.0%

    2.2

    CPU threads

    15.0%

    2.3

    L3 cache

  • intel-core-i5-8400t
intel-core-i5-8400t

Best prices in UK

Best rankings

?

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

Verdict

The Intel Core i5-8400T is a power-efficient 8th Generation Coffee Lake desktop processor featuring 6 cores and 6 threads with a low 35W TDP. It operates at a base frequency of 1.70 GHz and can reach a maximum turbo speed of 3.30 GHz, supported by 9MB of Intel Smart Cache and integrated Intel UHD Graphics 630. Main pros include its exceptional energy efficiency and low heat output, making it ideal for compact mini-PCs and silent builds, while still offering solid multi-core performance for daily productivity and light 4K media tasks. However, its primary cons are the significantly lower clock speeds compared to the standard i5-8400, a lack of Hyper-Threading, and limited gaming capabilities without a dedicated GPU.

Technical Specifications of processor Intel Core i5 8400T

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%

3.7

Performance

18.0%

4.9

Cache & Architecture

10.0%

5.2

Memory & PCIe

7.0%

7.1

Power & Thermal

4.0%

7.9

Platform

1.0%

6.9

Integrated Graphics

4.5
Intel Core i5 8400T has a technical score of 4.52 points, which is lower than that of 65.5% 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%

9.7

User reviews

30.0%

2.5

Popularity

User score:
United Kingdom
amazon
4.8
(11)
amazon
5.0
(3)
amazon
5.0
(1)

(Reviews last updated: May 2026)

7.6
Intel Core i5 8400T has a user score of 7.55 points, which is lower than that of 89.4% of products in this category.
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.
2.5
Intel Core i5 8400T has a popularity of 2.5 points, which is higher than 77% 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%

4.8

Overall score

40.0%

10

Price

6.4
Intel Core i5 8400T has a quality-to-price ratio of 6.4 points, which is higher than 49.1% 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

Intel
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
Intel Core i5 8400T 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

LGA1151
Intel Core i5 8400T uses the LGA1151 CPU socket, which is newer than that of 60.1% 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

Z390, Z370, Q370, H370, B365, B360, H310
Intel Core i5 8400T supports Z390, Z370, Q370, H370, B365, B360, H310 chipsets, which is broader compatibility than 57.1% of processors and equal to that of 4.4% 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
Intel Core i5 8400T 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+

6
Intel Core i5 8400T has 6 CPU cores, which is more than 49.9% of processors and equal to 13.4% 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+

6
Intel Core i5 8400T offers 6 CPU threads, which is fewer than 64.8% of processors and equal to 2.2% 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

1
Intel Core i5 8400T offers 1 threads per core, which is fewer than 69.7% of processors and equal to 30.3% 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

3.3 GHz
Intel Core i5 8400T reaches a boost clock of 3.3 GHz which is lower than that of 86.6% of processors and equal to that of 2.5% 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

6 x 1.7 GHz & 6 x 3.3 GHz
Intel Core i5 8400T has a base clock of 6x1.7 GHz & 6x3.3 GHz which is equal to that of 100% of processors.
Show more
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

14 nm
Intel Core i5 8400T uses a 14 nm process node, which is older than that of 50.8% of processors and equal to that of 33.7% 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

Intel 14 nm
Intel Core i5 8400T is built on the Intel 14 nm foundry process, which is less advanced than that of 55.2% of processors and equal to that of 29.3% 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

9 MB
Intel Core i5 8400T has an L3 cache of 9 MB which is larger than that of 51.7% of processors and equal to that of 1.9% 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

1.5 MB
Intel Core i5 8400T has an L2 cache of 1.5 MB which is smaller than that of 62.5% of processors and equal to that of 4.6% 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

384 KB
Intel Core i5 8400T has an L1 cache of 384 KB which is larger than that of 45% of processors and equal to that of 15.8% of processors.
Show more
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
Intel Core i5 8400T 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

2,666 MHz
Intel Core i5 8400T supports memory speeds up to 2,666 MHz, which is lower than that of 55% of processors and equal to 8.1% 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

DDR4-2666 MHz
Intel Core i5 8400T supports JEDEC memory speeds up to DDR4-2,666 MHz, which is lower than that of 55.3% of processors and equal to 7.4% 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
Intel Core i5 8400T supports up to 128 GB of memory, which is more than 61.9% of processors and equal to 21.4% of processors.
Show more
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

yes
Intel Core i5 8400T includes integrated graphics. 87.6% include integrated graphics.
Intel UHD Graphics 630
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

Intel UHD Graphics 630
Intel Core i5 8400T uses the Intel UHD Graphics 630 integrated GPU, which is more advanced than that in 44.3% and equal to that in 8.3%.
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

?
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

350 MHz
Intel Core i5 8400T has an integrated GPU clock of 350 MHz which is higher than that of 43.5% of processors and equal to that of 29.6% of processors.
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

VP9 (HW decode)
Intel Core i5 8400T supports VP9 (HW decode) media codecs, which is narrower support than 76.2% of processors and equal to 3.6% of processors.
Show more
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

35 W
Intel Core i5 8400T has a TDP of 35 W which is lower than that of 51.8% of processors and equal to that of 14.8% 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

35 W
Intel Core i5 8400T has a base power of 35 W which is lower than that of 51.7% of processors and equal to that of 15.1% 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

?
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

?
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
Intel Core i5 8400T supports configurable TDP. 52.9% support configurable TDP.
cTDP: 25 W
Show more

Intel Core i5 8400T vs the average processor

  • 2x more memory capacity
    Intel Core i5 8400T has more maximum memory capacity than the average processor (128 GB vs 64 GB). The average processor supports 64 GB of memory.
    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

    Intel Core i5 8400T has more maximum memory capacity than the average processor (128 GB vs 64 GB). The average processor supports 64 GB of memory.128 GB vs 64 GB
  • 2.52x more popular
    Intel Core i5 8400T is more popular than the average processor (2.52 vs 1,000).
    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.
    Intel Core i5 8400T is more popular than the average processor (2.52 vs 1,000).2.52 vs 1
  • 13.5% smaller die size
    Intel Core i5 8400T has a lower die size than the average processor (154 mm² vs 178 mm²). The average processor has a die size of 178 mm².
    What it is: The physical area of the processor die, usually measured in square millimeters.
    When it matters: When you are comparing chip scale, packaging density, or broader design differences rather than direct user-visible performance.

    Importance: LOW

    Good value: <150 mm²

    Intel Core i5 8400T has a lower die size than the average processor (154 mm² vs 178 mm²). The average processor has a die size of 178 mm².154 mm² vs 178 mm²
  • Modern CPU socket
    Intel Core i5 8400T uses a more modern CPU socket than the average processor (LGA1151 vs FP2).
    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

    Intel Core i5 8400T uses a more modern CPU socket than the average processor (LGA1151 vs FP2).LGA1151 vs FP2
  • 4.17x cheaper
    Intel Core i5 8400T is cheaper than the average processor (£60 vs £250).
    Intel Core i5 8400T is cheaper than the average processor (£60 vs £250).£60 vs £250
  • 22.2% lower base power
    Intel Core i5 8400T has a lower base power draw than the average processor (35 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

    Intel Core i5 8400T has a lower base power draw than the average processor (35 W vs 45 W). The average processor has a base power draw of 45 W.35 W vs 45 W
  • Modern CPU socket
    Intel Core i5 8400T uses a more modern CPU socket than the average processor (LGA1151 vs FP2).
  • 13.5% smaller die size
    Intel Core i5 8400T has a lower die size than the average processor (154 mm² vs 178 mm²). The average processor has a die size of 178 mm².
  • 2x more memory capacity
    Intel Core i5 8400T has more maximum memory capacity than the average processor (128 GB vs 64 GB). The average processor supports 64 GB of memory.
  • 22.2% lower base power
    Intel Core i5 8400T has a lower base power draw than the average processor (35 W vs 45 W). The average processor has a base power draw of 45 W.

Total
Overall
Platform
Cache & Architecture
Memory & PCIe
Power & Thermal
  • No crypto acceleration
    Intel Core i5 8400T does not include crypto acceleration, the average processor does.
  • 2 year/s older release date
    Intel Core i5 8400T has an older release date than the average processor (2018 vs 2020).
    April 2,018
  • 23.3% lower boost clock
    Intel Core i5 8400T has a lower boost clock speed than the average processor (3.3 GHz vs 4.3 GHz). The average processor reaches boost clock speed of 4.3 GHz.
  • 23.2% weaker single-core performance
    Intel Core i5 8400T has a lower PassMark single-core score than the average processor (1,906 vs 2,483). The average processor scores 2,483 in PassMark single-core.
  • 24.2% lower single-core score
    Intel Core i5 8400T has a lower Geekbench 6 single-core score than the average processor (1,115 vs 1,471). The average processor scores 1,471 in Geekbench 6 single-core.
  • No multithreading support
    Intel Core i5 8400T does not support multithreading, the average processor does.
  • 29.6% lower PassMark score
    Intel Core i5 8400T has a lower PassMark benchmark score than the average processor (7,417 vs 10,532.5). The average processor scores 10,532.5 in PassMark benchmark.
  • 1 fewer threads per core
    Intel Core i5 8400T has fewer threads per core than the average processor (1 vs 2). The average processor offers 2 threads per core.
  • 2 fewer CPU threads
    Intel Core i5 8400T has fewer CPU threads than the average processor (6 vs 8). The average processor has 8 CPU threads.
  • 18.4% lower multi-core score
    Intel Core i5 8400T has a lower Geekbench 6 multi-core score than the average processor (3,910 vs 4,793). The average processor scores 4,793 in Geekbench 6 multi-core.
  • 11 lower clock multiplier
    Intel Core i5 8400T has a lower clock multiplier than the average processor (17 vs 28). The average processor has a clock multiplier of 28.
  • 16.7% larger process node
    Intel Core i5 8400T has a higher process node than the average processor (14 nm vs 12 nm). The average processor uses a process node of 12 nm.
  • 50% less L2 per core
    Intel Core i5 8400T has less L2 cache per core than the average processor (0.3 MB/core vs 0.5 MB/core). The average processor provides 0.5 MB/core of L2 cache per core.
  • 12.5% less L3 per core
    Intel Core i5 8400T has less L3 cache per core than the average processor (1.5 MB/core vs 1,714 MB/core). The average processor provides 1,714 MB/core of L3 cache per core.
  • 40% smaller L2 cache
    Intel Core i5 8400T has a lower L2 cache than the average processor (1.5 MB vs 2.5 MB). The average processor has L2 cache of 2.5 MB.
  • 9.2% lower memory bandwidth
    Intel Core i5 8400T has a lower memory bandwidth than the average processor (41.6 GB/s vs 45.8 GB/s). The average processor offers memory bandwidth of 45.8 GB/s.
  • 9.1% lower memory speed
    Intel Core i5 8400T has a lower maximum memory speed than the average processor (2,666 MHz vs 2,933 MHz). The average processor supports memory speed of 2,933 MHz.
  • Narrower media codec support
    Intel Core i5 8400T supports fewer media codecs than the average processor (VP9 (HW decode) vs H.264 (HW decode/encode), H.265 (HW decode/encode), VP9 (HW decode/encode), AV1 (HW decode)).
  • 23.3% lower boost clock
    Intel Core i5 8400T has a lower boost clock speed than the average processor (3.3 GHz vs 4.3 GHz). The average processor reaches boost clock speed of 4.3 GHz.
    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

    Intel Core i5 8400T has a lower boost clock speed than the average processor (3.3 GHz vs 4.3 GHz). The average processor reaches boost clock speed of 4.3 GHz.3.3 GHz vs 4.3 GHz
  • 23.2% weaker single-core performance
    Intel Core i5 8400T has a lower PassMark single-core score than the average processor (1,906 vs 2,483). The average processor scores 2,483 in PassMark single-core.
    What it is: A benchmark score that reflects single-core CPU performance.
    When it matters: When you care about responsiveness in lighter or older software.

    Importance: HIGH

    Good value: >3200

    Intel Core i5 8400T has a lower PassMark single-core score than the average processor (1,906 vs 2,483). The average processor scores 2,483 in PassMark single-core.1,906 vs 2,483
  • 24.2% lower single-core score
    Intel Core i5 8400T has a lower Geekbench 6 single-core score than the average processor (1,115 vs 1,471). The average processor scores 1,471 in Geekbench 6 single-core.
    What it is: A Geekbench 6 score that reflects single-core CPU performance in mixed modern workloads.
    When it matters: When you care about snappy everyday performance in lighter apps, browsing, office work, or tasks that do not scale well across many cores.

    Importance: HIGH

    Good value: >2000

    Intel Core i5 8400T has a lower Geekbench 6 single-core score than the average processor (1,115 vs 1,471). The average processor scores 1,471 in Geekbench 6 single-core.1,115 vs 1,471
  • No multithreading support
    Intel Core i5 8400T does not support multithreading, the average processor does.
    What it is: Lets each physical core run more than one thread at the same time, such as with Hyper-Threading or SMT.
    When it matters: When multitasking, rendering, compiling, virtualization, or other thread-heavy work benefits from more total processing threads.

    Importance: HIGH

    Intel Core i5 8400T does not support multithreading, the average processor does.
  • 16.7% larger process node
    Intel Core i5 8400T has a higher process node than the average processor (14 nm vs 12 nm). The average processor uses a process node of 12 nm.
    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

    Intel Core i5 8400T has a higher process node than the average processor (14 nm vs 12 nm). The average processor uses a process node of 12 nm.14 nm vs 12 nm
  • 50% less L2 per core
    Intel Core i5 8400T has less L2 cache per core than the average processor (0.3 MB/core vs 0.5 MB/core). The average processor provides 0.5 MB/core of L2 cache per core.
    What it is: The amount of L2 cache available to each CPU core.
    When it matters: When you are comparing per-core cache resources in deeper architectural analysis.

    Importance: LOW

    Good value: >=1 MB/core

    Intel Core i5 8400T has less L2 cache per core than the average processor (0.3 MB/core vs 0.5 MB/core). The average processor provides 0.5 MB/core of L2 cache per core.0.25 MB/core vs 0.5 MB/core
  • Narrower media codec support
    Intel Core i5 8400T supports fewer media codecs than the average processor (VP9 (HW decode) vs H.264 (HW decode/encode), H.265 (HW decode/encode), VP9 (HW decode/encode), AV1 (HW decode)).
    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

    Intel Core i5 8400T supports fewer media codecs than the average processor (VP9 (HW decode) vs H.264 (HW decode/encode), H.265 (HW decode/encode), VP9 (HW decode/encode), AV1 (HW decode)).VP9 (HW decode) vs H.264 (HW decode/encode), H.265 (HW decode/encode), VP9 (HW decode/encode), AV1 (HW decode)
  • 12.5% less L3 per core
    Intel Core i5 8400T has less L3 cache per core than the average processor (1.5 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

    Intel Core i5 8400T has less L3 cache per core than the average processor (1.5 MB/core vs 1,714 MB/core). The average processor provides 1,714 MB/core of L3 cache per core.1.5 MB/core vs 1,714 MB/core
Total
Overall
Platform
Performance
Cache & Architecture
Memory & PCIe
Integrated Graphics

Graphic comparison of Intel Core i5 8400T and other processors

Attribute category
Attribute
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Third-party reviews

United Kingdom
amazon
4.8
11 Reviews
amazon
5.0
3 Reviews
amazon
5.0
1 Reviews

(Reviews last updated: May 2026)

What customers like about Intel Core i5 8400T?

  • Extremely low power consumption with a 35W TDP, making it ideal for mini-PCs and quiet office builds.
  • Features 6 physical cores which provide a significant multitasking boost over previous 4-core i5 generations.
  • Integrated UHD Graphics 630 is sufficient for basic 4K video playback and everyday productivity tasks.
  • Excellent thermal management; it runs very cool even in cramped enclosures with limited airflow.
  • Good value when found in the used market, often salvaged from decommissioned corporate tiny-in-one systems.

What customers dislike about Intel Core i5 8400T?

  • Very low base clock speed of 1.7 GHz can lead to sluggish performance in tasks that don't trigger turbo boost.
  • Struggles with modern AAA gaming; users report significant bottlenecks when paired with mid-to-high-end GPUs.
  • Lacks Hyper-Threading (6 cores / 6 threads), which limits its performance in heavily threaded professional workloads.
  • Locked multiplier prevents any traditional overclocking to improve performance.
  • The 3.3 GHz maximum turbo boost is considerably lower than the 4.0 GHz offered by the standard i5-8400 model.

Expert reviews

C
cpubenchmark.net
Daily Updated
Intel i5-8400T vs i5-8400 [cpubenchmark.net] by PassMark Software

The PassMark comparison between the Intel Core i5-8400 and i5-8400T reveals that the standard i5-8400 is roughly 20% faster in multi-threaded tasks, utilizing a higher 2.8 GHz base clock and 65W TDP for better performance. Conversely, the 35W "T" variant prioritizes energy efficiency for small form factor systems at the cost of lower clock speeds. While both share the same...Read more

R
ram-koenig.de
30/03/2026
Intel Core i5-8400T 3.3GHz Boost 6C 6T FCLGA1151 - SR3X6 Performance Data

The Intel Core i5-8400T (SR3X6) is a 6-core, 6-thread "T-series" Coffee Lake processor designed for energy efficiency in small form factor PCs, operating at a 35W TDP with a 1.70 GHz base and 3.30 GHz turbo frequency. Key advantages include its excellent thermal management and capability to handle daily tasks and 4K media consumption efficiently. However, the chip’s lower power...Read more

(Translated)Show original
C
cpu.userbenchmark.com
Daily Updated
Intel Core i5-8400T CM8068403358913 - UserBenchmark Tests

The Intel Core i5-8400T is a 6-core, 6-thread 8th Gen Coffee Lake desktop processor launched in 2018, optimized for energy efficiency with a low 35W TDP and a 1.70 GHz base frequency. It is designed for small form factor systems and is officially supported for Windows 11. Key advantages include superior power efficiency for low-noise systems and a 32% faster multi-core performance...Read more

(Translated)Show original
C
cpubenchmark.net
Daily Updated
Intel Core i5-8400T @ 1.70GHz - Performance Benchmarks

The Intel Core i5-8400T is a 35W TDP, 8th Gen Coffee Lake desktop processor featuring six cores and six threads, designed for energy efficiency and low heat in small form factor PCs. Operating at a 1.70 GHz base clock and boosting up to 3.30 GHz, it achieves a PassMark score of 7,419 and supports Windows 11. Key advantages include its low power consumption, minimal cooling...Read more

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H
hardware.info
05/10/2017
Intel Core i7 8700K / i5 8600K / i5 8400 'Coffee Lake' Review

Intel's 8th Generation "Coffee Lake" launch introduces six-core processors to the mainstream market, with the Core i7-8700K providing high-performance gaming and multitasking capabilities. The Core i5-8600K and i5-8400 offer strong performance for their price points, though they lack Hyper-Threading. While Coffee Lake boasts improved performance over Kaby Lake, it requires new Z370...Read more

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T
tweakers.net
24/03/2019
Thorough and Independent Intel Core i5-8400 Reviews

The Intel Core i5-8400, a key 8th Gen Coffee Lake processor, introduces six physical cores to the i5 tier, delivering exceptional gaming performance that closely rivals the previous flagship i7-7700K. Considered a high-value gaming choice, it boasts a strong price-to-performance ratio, a capable stock cooler, and efficient 65W TDP operation. However, the chip lacks Hyper-Threading...Read more

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