840A vs GT 640

Price now 158$
Games supported 58%
GT 640
NVIDIA GeForce GT 640
  • Interface PCIe 3.0 x16
  • Core clock speed 902 MHz
  • Max video memory 2 GB
  • Memory type DDR3
  • Memory clock speed 1782 MHz
  • Maximum resolution
GeForce 840A
NVIDIA GeForce 840A
  • Interface PCIe 3.0 x8
  • Core clock speed 1029 MHz
  • Max video memory 2 GB
  • Memory type DDR3
  • Memory clock speed 2002 MHz
  • Maximum resolution
Price now no data
Games supported 58%

General info

GPU architecture, market segment, value for money and other general parameters compared.

Place in performance ranking674676
Value for money0.25no data
ArchitectureKepler (2012−2018)Maxwell (2014−2018)
GPU code nameGK107GM108
Market segmentDesktopDesktop
Release date5 June 2012 (11 years old)17 March 2014 (9 years old)
Launch price (MSRP)$99 no data
Current price$158 (1.6x MSRP)no data
Value for money

Performance to price ratio. The higher, the better.

no data

Technical specs

General performance parameters such as number of shaders, GPU core base clock and boost clock speeds, manufacturing process, texturing and calculation speed. These parameters indirectly speak of performance, but for precise assessment you have to consider their benchmark and gaming test results. Note that power consumption of some graphics cards can well exceed their nominal TDP, especially when overclocked.

Pipelines / CUDA cores384384
Core clock speed902 MHz1029 MHz
Boost clock speedno data1124 MHz
Number of transistors1,270 millionno data
Manufacturing process technology28 nm28 nm
Power consumption (TDP)65 Watt33 Watt
Texture fill rate28.8617.98
Floating-point performance692.7 gflops863.2 gflops

Size and compatibility

Information on compatibility with other computer components. Useful when choosing a future computer configuration or upgrading an existing one. For desktop graphics cards it's interface and bus (motherboard compatibility), additional power connectors (power supply compatibility).

InterfacePCIe 3.0 x16PCIe 3.0 x8
Length145 mmno data
Supplementary power connectorsNoneno data


Parameters of VRAM installed: its type, size, bus, clock and resulting bandwidth. Integrated GPUs have no dedicated VRAM and use a shared part of system RAM.

Memory typeDDR3DDR3
Maximum RAM amount2 GB2 GB
Memory bus width128 Bit64 Bit
Memory clock speed1782 MHz2002 MHz
Memory bandwidth28.51 GB/s16.02 GB/s

Video outputs and ports

Types and number of video connectors present on the reviewed GPUs. As a rule, data in this section is precise only for desktop reference ones (so-called Founders Edition for NVIDIA chips). OEM manufacturers may change the number and type of output ports, while for notebook cards availability of certain video outputs ports depends on the laptop model rather than on the card itself.

Display Connectors1x DVI, 1x HDMI, 1x DisplayPortNo outputs
HDMI+no data

API support

List of supported graphics and general-purpose computing APIs, including their specific versions.

DirectX12 (11_0)12 (11_0)
Shader Model5.15.1

Synthetic benchmark performance

Non-gaming benchmark performance comparison. The combined score is measured on a 0-100 point scale.

Combined synthetic benchmark score

This is our combined benchmark performance score. We are regularly improving our combining algorithms, but if you find some perceived inconsistencies, feel free to speak up in comments section, we usually fix problems quickly.

GT 640 3.01
GeForce 840A 3.00


This is probably the most ubiquitous benchmark, part of Passmark PerformanceTest suite. It gives the graphics card a thorough evaluation under various load, providing four separate benchmarks for Direct3D versions 9, 10, 11 and 12 (the last being done in 4K resolution if possible), and few more tests engaging DirectCompute capabilities.

Benchmark coverage: 24%

GT 640 1184
GeForce 840A 1179

GeekBench 5 OpenCL

Geekbench 5 is a widespread graphics card benchmark combined from 11 different test scenarios. All these scenarios rely on direct usage of GPU's processing power, no 3D rendering is involved. This variation uses OpenCL API by Khronos Group.

Benchmark coverage: 9%

GT 640 3685
GeForce 840A 5596

840A outperforms GT 640 by 52% in GeekBench 5 OpenCL.

Mining hashrates

Cryptocurrency mining performance of GeForce GT 640 and GeForce 840A. Usually measured in megahashes per second.

Bitcoin / BTC (SHA256) 24 Mh/s no data

Gaming performance

Let's see how good the compared graphics cards are for gaming. Particular gaming benchmark results are measured in FPS.

Advantages and disadvantages

Performance score 3.01 3.00
Recency 5 June 2012 17 March 2014
Memory bus width 128 64
Memory bandwidth 28.51 16.02
Power consumption (TDP) 65 Watt 33 Watt

We couldn't decide between GeForce GT 640 and GeForce 840A. The differences in performance seem too small.

Should you still have questions concerning choice between the reviewed GPUs, ask them in Comments section, and we shall answer.

Cast your own vote

Do you think we are right or mistaken in our choice? Vote by clicking "Like" button near your favorite graphics card.

NVIDIA GeForce GT 640
GeForce GT 640
NVIDIA GeForce 840A
GeForce 840A

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User ratings: view and submit

Here you can see the user rating of the graphics cards, as well as rate them yourself.

3.4 960 votes

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Questions and comments

Here you can ask a question about this comparison, agree or disagree with our judgements, or report an error or mismatch.