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NVIDIA GeForce GT 640 Review | 118 Data compared

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  • Avg. price in UK: ~£90
  • Avg. price in US: ~$100
  • VRAM: 2 GB
  • Memory bus width: 128 bit
  • Thermal Design Power (TDP): 65 W

NVIDIA GeForce GT 640 review. Compare 118 technical specifications and user reviews to see how it ranks among graphics cards and if it is worth buying.

3.6

Overall score

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

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

Score components:

90.0%

3.0

Technical Score

10.0%

8.9

User score

Poor
3.0

Technical Score

What it is: An assessment of the graphics card's technical performance, covering key areas such as gaming and rendering performance, ray tracing, memory configuration, power efficiency, cooling, connectivity, features, and build quality.

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

Score components:

44.0%

1.7

Performance

24.0%

1.6

Memory

12.0%

7.2

Power & Cooling

11.0%

4.0

Platform & Features

5.0%

8.6

Design

4.0%

4.7

Connectivity & Media

Poor
8.9

User score

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

When it matters: When you want to understand how a graphics card performs in real use and how reliable it is in terms of performance, temperatures, noise, stability, and long-term ownership.

Score components:

70.0%

8.5

User reviews

30.0%

9.7

Popularity

User score:
United Kingdom
amazon
4.5
(161)
amazon
4.1
(52)
amazon
4.0
(34)
United States
Amazon_logo.png
4.5
(167)
Amazon_logo.png
4.1
(53)
Amazon_logo.png
3.6
(51)

(Reviews last updated: June 2026)

Excellent
  • 6.2
    Gaming

    Score components:

    45.0%

    ?

    Floating-point performance

    25.0%

    1.0

    VRAM

    20.0%

    ?

    Ray tracing cores / units

    10.0%

    7.6

    PCI Express (PCIe) version

  • 5.8
    Video editing

    Score components:

    35.0%

    ?

    AV1 encode

    30.0%

    1.0

    VRAM

    20.0%

    ?

    Floating-point performance

    15.0%

    7.6

    PCI Express (PCIe) version

  • 6.2
    1080p

    Score components:

    55.0%

    ?

    Floating-point performance

    25.0%

    1.0

    VRAM

    10.0%

    ?

    Ray tracing cores / units

    10.0%

    7.6

    PCI Express (PCIe) version

  • 5.9
    1440p

    Score components:

    50.0%

    ?

    Floating-point performance

    30.0%

    1.0

    VRAM

    15.0%

    ?

    Ray tracing cores / units

    5.0%

    7.6

    PCI Express (PCIe) version

  • 5.5
    4K

    Score components:

    40.0%

    ?

    Floating-point performance

    35.0%

    1.0

    VRAM

    20.0%

    ?

    Ray tracing cores / units

    5.0%

    7.6

    PCI Express (PCIe) version

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Best prices in UK

Best rankings

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

Verdict

The NVIDIA GeForce GT 640 is an entry-level graphics card launched in 2012 based on the 28nm Kepler architecture (GK107), featuring 384 CUDA cores, 32 texture mapping units, and 16 ROPs with a base clock speed of approximately 902 MHz. It typically comes with either 1GB or 2GB of DDR3 or GDDR5 memory across a 128-bit interface, offering a power-efficient profile with a 65W TDP that requires no external power connectors. Its main advantages include its small single-slot form factor suitable for compact PCs, low power consumption, and support for hardware video encoding via NVENC. However, it suffers from significant performance limitations in modern 1080p gaming, utilizes slower DDR3 memory in many variants which bottlenecks bandwidth, and lacks support for newer DirectX 12 feature levels.

Technical Specifications of NVIDIA GeForce GT 640

Technical Score

What it is: An assessment of the graphics card's technical performance, covering key areas such as gaming and rendering performance, ray tracing, memory configuration, power efficiency, cooling, connectivity, features, and build quality.

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

Score components:

44.0%

1.7

Performance

24.0%

1.6

Memory

12.0%

7.2

Power & Cooling

11.0%

4.0

Platform & Features

5.0%

8.6

Design

4.0%

4.7

Connectivity & Media

3.0
NVIDIA GeForce GT 640 has a technical score of 3.04 points, which is lower than that of 97.3% 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 graphics card.

When it matters: When you want to understand how a graphics card performs in real use and how reliable it is in terms of performance, temperatures, noise, stability, and long-term ownership.

Score components:

70.0%

8.5

User reviews

30.0%

9.7

Popularity

User score:
United Kingdom
amazon
4.5
(161)
amazon
4.1
(52)
amazon
4.0
(34)
United States
Amazon_logo.png
4.5
(167)
Amazon_logo.png
4.1
(53)
Amazon_logo.png
3.6
(51)

(Reviews last updated: June 2026)

8.9
NVIDIA GeForce GT 640 has a user score of 8.86 points, which is higher than that of 76% of products in this category.
Popularity
What it is: An indicator based on the number of reviews received by the graphics card.
When it matters: When you prefer a graphics card that has already been chosen and reviewed by many other users.
9.7
NVIDIA GeForce GT 640 has a popularity of 9.7 points, which is higher than 77.2% of products in this category.
Ratio quality/price

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

When it matters: When you are looking for a graphics card that offers a strong balance of performance, features, and price.

Score components:

60.0%

3.6

Overall score

40.0%

10

Price

5.5
NVIDIA GeForce GT 640 has a quality-to-price ratio of 5.5 points, which is lower than 90.9% of products in this category.
3DMark Time Spy benchmark score
What it is: Benchmark result from 3DMark Time Spy, a synthetic DirectX 12 test often used as a quick gaming-performance reference.
When it matters: When you need a fast rough performance sort before digging into game-specific reviews and frame-rate data.

Importance: LOW

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3DMark Port Royal score
What it is: Benchmark result from 3DMark Port Royal, a synthetic test focused on ray tracing performance.
When it matters: When ray tracing matters in the games you actually play and you want one quick way to separate stronger and weaker RT cards.

Importance: LOW

N/A
PassMark (G3D) result
What it is: Overall GPU performance score in PassMark G3D benchmark
When it matters: When you need one broad score to sort cards into rough performance tiers.

Importance: LOW

?
PassMark (DirectCompute) result
What it is: PassMark score for DirectCompute performance tests
When it matters: When compute workloads matter alongside gaming performance.

Importance: LOW

1,297 points
NVIDIA GeForce GT 640 scores 1297 points in PassMark DirectCompute, which is lower than 83.9% of graphics cards.
Floating-point performance
What it is: Theoretical floating-point compute performance of the GPU.
When it matters: When rendering, AI, or heavy compute work needs strong single-precision throughput.

Importance: LOW

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VRAM
What it is: Total video memory available on the graphics card
When it matters: When you play at high settings, use texture mods, or work with large creative projects.

Importance: HIGH

2 GB
NVIDIA GeForce GT 640 has 2 GB of VRAM, which is less than 94.5% of graphics cards and equal to 3.9% of graphics cards.
Memory type
What it is: Type of graphics memory used (GDDR6, HBM2e, etc.)
When it matters: When memory technology is part of the buying decision because it affects bandwidth class, power use, and product positioning.

Importance: LOW

DDR3
GDDR version
What it is: Generation of GDDR memory used by the graphics card.
When it matters: When you want to separate older memory generations from newer ones before comparing bandwidth, power behavior, and market tier.

Importance: LOW

?
Memory bus width
What it is: Width of the memory interface bus in bits
When it matters: When you care about steadier performance at higher resolutions, heavier texture settings, or ray-traced workloads that stress memory traffic.

Importance: HIGH

128 bit
NVIDIA GeForce GT 640 uses a 128 bit memory bus, which is narrower than that of 69.8% of graphics cards and equal to that of 26.1% of graphics cards.
Maximum memory bandwidth
What it is: Maximum data transfer rate between GPU and its memory
When it matters: When 4K gaming, ray tracing, or creator work can choke a slower memory subsystem.

Importance: HIGH

28.5 GB/s
NVIDIA GeForce GT 640 reaches 28.5 GB/s memory bandwidth, which is lower than that of 99.2% of graphics cards.
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PCI Express (PCIe) version
What it is: Version of PCI Express interface supported
When it matters: When you are pairing the card with an older motherboard and want to avoid leaving bandwidth or future compatibility on the table.

Importance: LOW

3.0
NVIDIA GeForce GT 640 supports PCIe 3.0, which is older than on 77.6% of graphics cards and equal to 20.3% of graphics cards.
PCIe lanes
What it is: Number of PCI Express lanes used for communication
When it matters: When limited lane width could bottleneck the card in some systems.

Importance: LOW

?
DirectX version
What it is: Highest supported DirectX API version
When it matters: When you play newer Windows games that depend on the latest graphics features.

Importance: LOW

12
NVIDIA GeForce GT 640 supports DirectX 12, which is older than on 92.7% of graphics cards and equal to 7.1% of graphics cards.
Vulkan version
What it is: Highest supported Vulkan API version
When it matters: When modern games, emulators, or creative apps lean on Vulkan support.

Importance: LOW

1.2
NVIDIA GeForce GT 640 supports Vulkan 1.2, which is older than on 96% of graphics cards and equal to 2.5% of graphics cards.
OpenGL version
What it is: Highest supported OpenGL API version
When it matters: When older games or pro apps still depend on OpenGL compatibility.

Importance: LOW

4.6
NVIDIA GeForce GT 640 supports OpenGL 4.6, which is more advanced than on 4.8% of graphics cards and equal to 95.2% of graphics cards.
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Max displays supported
What it is: Total number of external displays supported simultaneously
When it matters: When you run a multi-monitor desk for sim racing, trading, or editing.

Importance: LOW

?
Max digital resolution
What it is: Maximum supported digital display resolution
When it matters: When you plan to drive 4K or 8K panels at their native resolution.

Importance: LOW

?
DisplayPort outputs
What it is: Number of DisplayPort video outputs
When it matters: When your setup needs several high-refresh monitors without adapters.

Importance: LOW

0
NVIDIA GeForce GT 640 offers 0 DisplayPort outputs, which is fewer than 98.1% of graphics cards and equal to 1.9% of graphics cards.
DisplayPort version
What it is: Version of DisplayPort standard supported
When it matters: When your monitor setup depends on newer DisplayPort features for higher refresh rates, higher resolution, or better cable flexibility.

Importance: LOW

1.2
NVIDIA GeForce GT 640 supports DisplayPort 1.2, which is older than on 93.6% of graphics cards and equal to 4.8% of graphics cards.
DisplayPort link rates
What it is: Supported data link rates for DisplayPort connections
When it matters: When you are pushing high resolution and refresh rate over DisplayPort.

Importance: LOW

5.4 Gbps
NVIDIA GeForce GT 640 supports DisplayPort link rates up to 5.4 Gbps, which is slower than on 90.9% of graphics cards and equal to 8% of graphics cards.
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Thermal Design Power (TDP)
What it is: Typical power consumption under full load (TDP)
When it matters: When you need a realistic idea of power draw before choosing a PSU or case.

Importance: MEDIUM

65 W
NVIDIA GeForce GT 640 has a TDP of 65 W, which is lower than that of 95.2% of graphics cards and equal to that of 0.5% of graphics cards.
Power consumption while under peak load
What it is: Peak power draw of the graphics card under maximum load.
When it matters: When transient-heavy gaming loads could stress your power supply.

Importance: LOW

65 W
NVIDIA GeForce GT 640 draws 65 W under peak load, which is lower than 95.3% of graphics cards and equal to 0.4% of graphics cards.
Recommended PSU wattage
What it is: Recommended wattage of the system power supply
When it matters: When you are checking whether your current power supply is enough.

Importance: LOW

350 W
NVIDIA GeForce GT 640 recommends a 350 W PSU, which is lower than that of 94.2% of graphics cards and equal to that of 1% of graphics cards.
Board power limit
What it is: Maximum configurable power limit for the GPU board
When it matters: When you care about how far the card can be pushed through tuning or factory power settings.

Importance: LOW

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PCIe power spec
What it is: PCIe power delivery specification followed
When it matters: When you are checking whether the slot and external cables match the card's intended power-delivery standard.

Importance: LOW

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Size
What it is: Physical size of the GPU card
When it matters: When you need the card to fit a compact case without blocking nearby hardware.

Importance: LOW

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Length
What it is: Physical length of the GPU card
When it matters: When front radiators or drive cages leave only limited GPU clearance.

Importance: LOW

145 mm
NVIDIA GeForce GT 640 is 145 mm long, which is shorter than 98.9% of graphics cards and equal in length to 1% of graphics cards.
Height
What it is: Physical height of the GPU card
When it matters: When side panels, brackets, or tight case layouts reduce vertical clearance.

Importance: LOW

111 mm
NVIDIA GeForce GT 640 is 111 mm tall, which is shorter than 89.6% of graphics cards and equal in height to 5.6% of graphics cards.
Slot width
What it is: Number of PCIe slots occupied by the card
When it matters: When you need room for another PCIe card or better airflow under the GPU.

Importance: LOW

1 slot/s
NVIDIA GeForce GT 640 occupies 1 slot/s, which is slimmer than 96.6% of graphics cards and equal in width to 3.4% of graphics cards.
Weight
What it is: Total weight of the graphics card
When it matters: When sag, bracket support, or shipping stress matters in your build.

Importance: LOW

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NVIDIA GeForce GT 640 vs the average graphics card

  • 69.8% lower TDP
    NVIDIA GeForce GT 640 has a lower TDP than the average graphics card (65 W vs 215 W). The average graphics card has a TDP of 215 W.
    What it is: Typical power consumption under full load (TDP)
    When it matters: When you need a realistic idea of power draw before choosing a PSU or case.

    Importance: MEDIUM

    NVIDIA GeForce GT 640 has a lower TDP than the average graphics card (65 W vs 215 W). The average graphics card has a TDP of 215 W.65 W vs 215 W
  • 46.2% lower PSU requirement
    NVIDIA GeForce GT 640 has a lower PSU requirement than the average graphics card (350 W vs 650 W). The average graphics card has a PSU requirement of 650 W.
    What it is: Recommended wattage of the system power supply
    When it matters: When you are checking whether your current power supply is enough.

    Importance: LOW

    NVIDIA GeForce GT 640 has a lower PSU requirement than the average graphics card (350 W vs 650 W). The average graphics card has a PSU requirement of 650 W.350 W vs 650 W
  • 140.37 mm shorter card length
    NVIDIA GeForce GT 640 is shorter than the average graphics card (145 mm vs 285.37 mm). The average graphics card has a length of 285.37 mm.
    What it is: Physical length of the GPU card
    When it matters: When front radiators or drive cages leave only limited GPU clearance.

    Importance: LOW

    NVIDIA GeForce GT 640 is shorter than the average graphics card (145 mm vs 285.37 mm). The average graphics card has a length of 285.37 mm.145 mm vs 285.37 mm
  • 8x larger L2 cache
    NVIDIA GeForce GT 640 has more L2 cache than the average graphics card (256 MB vs 32 MB). The average graphics card has 32 MB L2 cache.
    What it is: Total size of the GPU’s L2 cache memory
    When it matters: When cache size can help the GPU feed data faster in demanding scenes.

    Importance: LOW

    NVIDIA GeForce GT 640 has more L2 cache than the average graphics card (256 MB vs 32 MB). The average graphics card has 32 MB L2 cache.256 MB vs 32 MB
  • 16 mm lower card height
    NVIDIA GeForce GT 640 is shorter than the average graphics card (111 mm vs 127 mm). The average graphics card has a height of 127 mm.
    What it is: Physical height of the GPU card
    When it matters: When side panels, brackets, or tight case layouts reduce vertical clearance.

    Importance: LOW

    NVIDIA GeForce GT 640 is shorter than the average graphics card (111 mm vs 127 mm). The average graphics card has a height of 127 mm.111 mm vs 127 mm
  • 1 slot/s slimmer design
    NVIDIA GeForce GT 640 occupies fewer slots than the average graphics card (1 slot/s vs 2 slot/s). The average graphics card occupies 2 slot/s.
    What it is: Number of PCIe slots occupied by the card
    When it matters: When you need room for another PCIe card or better airflow under the GPU.

    Importance: LOW

    NVIDIA GeForce GT 640 occupies fewer slots than the average graphics card (1 slot/s vs 2 slot/s). The average graphics card occupies 2 slot/s.1 slot/s vs 2 slot/s
  • 2 more DVI outputs
    NVIDIA GeForce GT 640 has more DVI outputs than the average graphics card (2 vs 0). The average graphics card has 0 DVI outputs.
    What it is: Number of DVI display outputs available
    When it matters: When you still use an older monitor that depends on DVI.

    Importance: LOW

    NVIDIA GeForce GT 640 has more DVI outputs than the average graphics card (2 vs 0). The average graphics card has 0 DVI outputs.2 vs 0
  • 5.89x cheaper
    NVIDIA GeForce GT 640 is cheaper than the average graphics card (£90 vs £530).
    NVIDIA GeForce GT 640 is cheaper than the average graphics card (£90 vs £530).£90 vs £530
  • Better FP64 ratio
    NVIDIA GeForce GT 640 has a better FP64 ratio than the average graphics card (1:24 vs 1:64).
  • 8x larger L2 cache
    NVIDIA GeForce GT 640 has more L2 cache than the average graphics card (256 MB vs 32 MB). The average graphics card has 32 MB L2 cache.
  • 61.2% smaller GPU die
    NVIDIA GeForce GT 640 has a lower GPU die size than the average graphics card (118 mm² vs 304.25 mm²). The average graphics card has a GPU die size of 304.25 mm².
  • 2 more DVI outputs
    NVIDIA GeForce GT 640 has more DVI outputs than the average graphics card (2 vs 0). The average graphics card has 0 DVI outputs.
  • 69.8% lower TDP
    NVIDIA GeForce GT 640 has a lower TDP than the average graphics card (65 W vs 215 W). The average graphics card has a TDP of 215 W.
  • 46.2% lower PSU requirement
    NVIDIA GeForce GT 640 has a lower PSU requirement than the average graphics card (350 W vs 650 W). The average graphics card has a PSU requirement of 650 W.
  • 13 °C lower load temperature
    NVIDIA GeForce GT 640 has a lower load temperature than the average graphics card (54 °C vs 67 °C). The average graphics card has a load temperature of 67 °C.
  • 70.5% lower peak power draw
    NVIDIA GeForce GT 640 has a lower peak power draw than the average graphics card (65 W vs 220 W). The average graphics card has a peak power draw of 220 W.
  • 140.37 mm shorter card length
    NVIDIA GeForce GT 640 is shorter than the average graphics card (145 mm vs 285.37 mm). The average graphics card has a length of 285.37 mm.
  • 16 mm lower card height
    NVIDIA GeForce GT 640 is shorter than the average graphics card (111 mm vs 127 mm). The average graphics card has a height of 127 mm.
  • 1 slot/s slimmer design
    NVIDIA GeForce GT 640 occupies fewer slots than the average graphics card (1 slot/s vs 2 slot/s). The average graphics card occupies 2 slot/s.

Total
Overall
Performance
Memory
Platform & Features
Connectivity & Media
Power & Cooling
Design
  • 38 fewer compute units
    NVIDIA GeForce GT 640 has fewer compute units than the average graphics card (2 vs 40). The average graphics card has 40 compute units.
  • 53% lower base clock speed
    NVIDIA GeForce GT 640 has a lower base GPU clock than the average graphics card (902 MHz vs 1,920 MHz). The average graphics card has a base GPU clock of 1,920 MHz.
  • 152 fewer TMUs
    NVIDIA GeForce GT 640 has fewer TMUs than the average graphics card (32 vs 184). The average graphics card has 184 TMUs.
  • 95.6% lower pixel rate
    NVIDIA GeForce GT 640 has a lower pixel rate than the average graphics card (7.2 GPixel/s vs 165.2 GPixel/s). The average graphics card has a pixel rate of 165.2 GPixel/s.
  • 48 fewer ROPs
    NVIDIA GeForce GT 640 has fewer ROPs than the average graphics card (16 vs 64). The average graphics card has 64 ROPs.
  • 97% lower FP32 performance
    NVIDIA GeForce GT 640 has a lower FP32 performance than the average graphics card (0.7 TFLOPS vs 22.86 TFLOPS). The average graphics card has FP32 performance of 22.86 TFLOPS.
  • 3,968 fewer FP32 units
    NVIDIA GeForce GT 640 has fewer FP32 units than the average graphics card (384 vs 4,352). The average graphics card has 4,352 FP32 units.
  • 72.7% lower compute score
    NVIDIA GeForce GT 640 has a lower compute score than the average graphics card (1,297 points vs 4,745 points). The average graphics card has a compute score of 4,745 points.
  • 128 bit narrower memory bus
    NVIDIA GeForce GT 640 has a narrower memory bus than the average graphics card (128 bit vs 256 bit). The average graphics card has a memory bus width of 256 bit.
  • 10 GB less VRAM
    NVIDIA GeForce GT 640 has fewer VRAM than the average graphics card (2 GB vs 12 GB). The average graphics card has 12 GB VRAM.
  • 93.6% lower memory bandwidth
    NVIDIA GeForce GT 640 has a lower memory bandwidth than the average graphics card (28.5 GB/s vs 448 GB/s). The average graphics card has a memory bandwidth of 448 GB/s.
  • 90.6% slower memory speed
    NVIDIA GeForce GT 640 has a lower effective memory speed than the average graphics card (1,782 MHz vs 19,000 MHz). The average graphics card reaches an effective memory speed of 19,000 MHz.
  • 49.1% slower VRAM clock
    NVIDIA GeForce GT 640 has a lower VRAM clock than the average graphics card (891 MHz vs 1,750 MHz). The average graphics card runs its VRAM at 1,750 MHz.
  • 87.5% smaller L1 cache
    NVIDIA GeForce GT 640 has fewer L1 cache than the average graphics card (16 vs 128). The average graphics card has 128 L1 cache.
  • 5.6x larger process node
    NVIDIA GeForce GT 640 has a higher process node than the average graphics card (28 nm vs 5 nm). The average graphics card uses a process node of 5 nm.
  • 11 older
    NVIDIA GeForce GT 640 was released earlier than the average graphics card (2,012 vs 2,023).
  • Older PCIe version
    NVIDIA GeForce GT 640 supports an older PCIe version than the average graphics card (3 vs 4.0).
  • No XeSS support
    NVIDIA GeForce GT 640 does not support XeSS, the average graphics card does.
  • No mesh shaders
    NVIDIA GeForce GT 640 does not support mesh shaders, the average graphics card does.
  • Older Vulkan version
    NVIDIA GeForce GT 640 supports an older Vulkan version than the average graphics card (1.2 vs 1.4).
  • Older encoder generation
    NVIDIA GeForce GT 640 uses an older encoder generation than the average graphics card (1 vs 8). The average graphics card uses encoder generation 8.
  • Older DirectX version
    NVIDIA GeForce GT 640 supports an older DirectX version than the average graphics card (12 vs 12 Ultimate).
  • No sampler feedback
    NVIDIA GeForce GT 640 does not support sampler feedback, the average graphics card does.
  • 94.2% fewer transistors
    NVIDIA GeForce GT 640 has fewer transistors than the average graphics card (1,270 million vs 21,900 million). The average graphics card has 21,900 million transistors.
  • 3 fewer DisplayPort outputs
    NVIDIA GeForce GT 640 has fewer DisplayPort outputs than the average graphics card (0 vs 3). The average graphics card has 3 DisplayPort outputs.
  • No AV1 decoding
    NVIDIA GeForce GT 640 does not support AV1 decoding, the average graphics card does.
  • No DSC support
    NVIDIA GeForce GT 640 does not support DSC, the average graphics card does.
  • Older HDMI version
    NVIDIA GeForce GT 640 supports an older HDMI version than the average graphics card (1.4a vs 2.1).
  • Older DisplayPort version
    NVIDIA GeForce GT 640 supports an older DisplayPort version than the average graphics card (1.2 vs 1.4a).
  • Not VR ready
    NVIDIA GeForce GT 640 is not VR ready, while the average graphics card is.
  • Older NVDEC generation
    NVIDIA GeForce GT 640 has a lower NVDEC generation than the average graphics card (1 vs 6). The average graphics card offers NVDEC generation 6.
  • 2 fewer fans
    NVIDIA GeForce GT 640 has fewer fans than the average graphics card (1 vs 3).
  • No fan stop
    NVIDIA GeForce GT 640 does not support fan stop, the average graphics card does.
  • No backplate
    NVIDIA GeForce GT 640 does not include a backplate, the average graphics card does.
  • 128 bit narrower memory bus
    NVIDIA GeForce GT 640 has a narrower memory bus than the average graphics card (128 bit vs 256 bit). The average graphics card has a memory bus width of 256 bit.
    What it is: Width of the memory interface bus in bits
    When it matters: When you care about steadier performance at higher resolutions, heavier texture settings, or ray-traced workloads that stress memory traffic.

    Importance: HIGH

    NVIDIA GeForce GT 640 has a narrower memory bus than the average graphics card (128 bit vs 256 bit). The average graphics card has a memory bus width of 256 bit.128 bit vs 256 bit
  • 38 fewer compute units
    NVIDIA GeForce GT 640 has fewer compute units than the average graphics card (2 vs 40). The average graphics card has 40 compute units.
    What it is: Total number of shader multiprocessors or compute units
    When it matters: When you want a better sense of the GPU's overall parallel hardware resources before relying on game benchmarks alone.

    Importance: HIGH

    NVIDIA GeForce GT 640 has fewer compute units than the average graphics card (2 vs 40). The average graphics card has 40 compute units.2 vs 40
  • 5.6x larger process node
    NVIDIA GeForce GT 640 has a higher process node than the average graphics card (28 nm vs 5 nm). The average graphics card uses a process node of 5 nm.
    What it is: Size of the manufacturing process in nanometers
    When it matters: When process node differences may affect power, heat, and overall efficiency.

    Importance: MEDIUM

    NVIDIA GeForce GT 640 has a higher process node than the average graphics card (28 nm vs 5 nm). The average graphics card uses a process node of 5 nm.28 nm vs 5 nm
  • 2 fewer fans
    NVIDIA GeForce GT 640 has fewer fans than the average graphics card (1 vs 3).
    What it is: Total number of cooling fans
    When it matters: When you compare cooler designs and want one more clue about thermal potential.

    Importance: MEDIUM

    NVIDIA GeForce GT 640 has fewer fans than the average graphics card (1 vs 3).1 vs 3
  • 10 GB less VRAM
    NVIDIA GeForce GT 640 has fewer VRAM than the average graphics card (2 GB vs 12 GB). The average graphics card has 12 GB VRAM.
    What it is: Total video memory available on the graphics card
    When it matters: When you play at high settings, use texture mods, or work with large creative projects.

    Importance: HIGH

    NVIDIA GeForce GT 640 has fewer VRAM than the average graphics card (2 GB vs 12 GB). The average graphics card has 12 GB VRAM.2 GB vs 12 GB
  • 53% lower base clock speed
    NVIDIA GeForce GT 640 has a lower base GPU clock than the average graphics card (902 MHz vs 1,920 MHz). The average graphics card has a base GPU clock of 1,920 MHz.
    What it is: Base operating frequency of the GPU core under standard conditions
    When it matters: When you want to understand the card's guaranteed starting frequency instead of looking only at optimistic boost figures.

    Importance: HIGH

    NVIDIA GeForce GT 640 has a lower base GPU clock than the average graphics card (902 MHz vs 1,920 MHz). The average graphics card has a base GPU clock of 1,920 MHz.902 MHz vs 1920 MHz
  • 152 fewer TMUs
    NVIDIA GeForce GT 640 has fewer TMUs than the average graphics card (32 vs 184). The average graphics card has 184 TMUs.
    What it is: Total count of texture mapping units on the GPU
    When it matters: When texture-heavy gaming performance matters and you want extra hardware context behind texture-rate claims.

    Importance: HIGH

    NVIDIA GeForce GT 640 has fewer TMUs than the average graphics card (32 vs 184). The average graphics card has 184 TMUs.32 vs 184
  • 93.6% lower memory bandwidth
    NVIDIA GeForce GT 640 has a lower memory bandwidth than the average graphics card (28.5 GB/s vs 448 GB/s). The average graphics card has a memory bandwidth of 448 GB/s.
    What it is: Maximum data transfer rate between GPU and its memory
    When it matters: When 4K gaming, ray tracing, or creator work can choke a slower memory subsystem.

    Importance: HIGH

    NVIDIA GeForce GT 640 has a lower memory bandwidth than the average graphics card (28.5 GB/s vs 448 GB/s). The average graphics card has a memory bandwidth of 448 GB/s.28.5 GB/s vs 448 GB/s
Total
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Performance
Memory
Platform & Features
Connectivity & Media
Power & Cooling
Design

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Third-party reviews

United Kingdom
amazon
4.5
161 Reviews
amazon
4.1
52 Reviews
amazon
4.0
34 Reviews
United States
Amazon_logo.png
4.5
167 Reviews
Amazon_logo.png
4.1
53 Reviews
Amazon_logo.png
3.6
51 Reviews

(Reviews last updated: June 2026)

What customers like about NVIDIA GeForce GT 640?

  • Low power consumption: Does not require external power connectors, running entirely off the PCIe slot.
  • Compact design: Available in single-slot and low-profile versions, making it ideal for small form factor (SFF) or HTPC builds.
  • Multi-monitor support: Efficiently supports up to three or four displays, which is highly valued for productivity tasks.
  • Quiet and cool operation: Many models feature near-silent cooling solutions and maintain low operating temperatures.
  • Ease of installation: Frequently described as a 'plug and play' solution that is simple to set up.

What customers dislike about NVIDIA GeForce GT 640?

  • Poor price-to-performance ratio: Historically priced too high compared to faster alternatives like the AMD Radeon HD 7770 or HD 6670.
  • Limited gaming performance: Struggles with modern 1080p titles; typically restricted to low settings or older/lighter games.
  • Lack of 'GPU Boost': Unlike higher-end Kepler cards, it cannot dynamically increase clock speeds for better performance.
  • Outdated memory: Many versions utilize slower DDR3 memory rather than faster GDDR5, which significantly bottlenecks performance.
  • Limited driver support: As an older Kepler-based GPU, it no longer receives the latest driver updates required for new software.

Expert reviews

T
techradar.com
29/10/2013
Gainward GeForce GT 640 rev.2 review - TechRadar

This review evaluates the Gainward GeForce GT 640 rev.2, a low-profile graphics card utilising Nvidia's GK 208 Kepler architecture. It stands out as an excellent choice for mini-ITX and small form factor PC builds due to its compact half-height design and efficient, quiet cooling fan. Performance-wise, the card handles gaming adequately when settings are lowered from peak levels,...Read more

T
techpowerup.com
02/07/2012
ZOTAC GeForce GT 640 2 GB Review - TechPowerUp

The TechPowerUp review of the ZOTAC GeForce GT 640 2 GB highlights excellent power efficiency, a compact single-slot design requiring no external power, and support for three independent displays. Ideal for HTPC use, it provides updated API support, though it is not intended for high-performance gaming. Conversely, the card features slow DDR3 memory, low gaming performance, and a...Read more

T
tomshardware.com
04/06/2012
Nvidia GeForce GT 640 Review: Cramming Kepler Into GK107

The Nvidia GeForce GT 640 introduces the 28 nm Kepler architecture to the budget market via the GK107 graphics processor, packing 384 CUDA cores, 32 texture units, and 16 ROPs running at a core clock of 902 MHz. While the card modernizes entry-level features by supporting PCI Express 3.0 and native multi-monitor setups across three displays without needing a DisplayPort adapter, its...Read more

N
noticias3d.com
03/07/2012
Zotac GeForce GT 640 a prueba

The Zotac GeForce GT 640 is a compact, single-slot budget graphics card built on NVIDIA's Kepler architecture using the GK107 chip. Retailing at a recommended price of $110, this entry-level model features 2 GB of DDR3 VRAM, 16 ROPs, a 128-bit memory bus, and 384 CUDA Cores. Operating at a stock core speed of 891 MHz and a memory speed of 1,800 MHz, it functions without a turbo...Read more

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