Select any two GPUs for comparison

Gaming Performance Comparison

Recommended System Requirements
Game GeForce GT 640 GeForce 8800 GTX 768MB
Hitman 3 880% 705%
Cyberpunk 2077 653% 519%
Assassins Creed: Valhalla 589% 466%
FIFA 21 280% 212%
Grand Theft Auto VI 960% 771%
Call of Duty: Black Ops Cold War 567% 448%
Resident Evil 8 653% 519%
Genshin Impact 653% 519%
Far Cry 6 990% 796%
The Medium 840% 673%

In terms of overall gaming performance, the graphical capabilities of the Nvidia GeForce 8800 GTX 768MB are noticeably better than the Nvidia GeForce GT 640.

The GeForce GT 640 has a 327 MHz higher core clock speed and the same number of Texture Mapping Units as the 8800 GTX. This results in the GeForce GT 640 providing 10.5 GTexel/s better texturing performance. This still holds weight but shader performance is generally more relevant, particularly since both of these GPUs support at least DirectX 10.

The GeForce GT 640 has a 327 MHz higher core clock speed but 8 fewer Render Output Units than the 8800 GTX. The lower ROP count doesn't matter, though, as altogether the GeForce GT 640 manages to provide 0.6 GPixel/s better pixeling performance. However, both GPUs support DirectX 9 or above, and pixeling performance is only really relevant when comparing older cards.

The GeForce GT 640 was released over three years more recently than the 8800 GTX, and so the GeForce GT 640 is likely to have far better driver support, meaning it will be much more optimized and ultimately superior to the 8800 GTX when running the latest games.

The GeForce GT 640 has 1280 MB more video memory than the 8800 GTX, so is likely to be much better at displaying game textures at higher resolutions. However, overall, the 8800 GTX has superior memory performance.

The 8800 GTX has 57.9 GB/sec greater memory bandwidth than the GeForce GT 640, which means that the memory performance of the 8800 GTX is much better than the GeForce GT 640.

The GeForce GT 640 has 384 Shader Processing Units and the GeForce 8800 GTX 768MB has 128. However, the actual shader performance of the GeForce GT 640 is 346 and the actual shader performance of the 8800 GTX is 184. The GeForce GT 640 having 162 better shader performance is not particularly notable, as altogether the 8800 GTX performs better when taking into account other relevant data.

The GeForce GT 640 transistor size technology is 62 nm (nanometers) smaller than the 8800 GTX. This means that the GeForce GT 640 is expected to run massively cooler and achieve higher clock frequencies than the 8800 GTX.

The GeForce GT 640 requires 65 Watts to run and the GeForce 8800 GTX 768MB requires 158 Watts. We would recommend a PSU with at least 350 Watts for the GeForce GT 640 and a PSU with at least 450 Watts for the 8800 GTX. The 8800 GTX requires 93 Watts more than the GeForce GT 640 to run. The difference is significant enough that the 8800 GTX may have an adverse affect on your yearly electricity bills in comparison to the GeForce GT 640.

Game FPS Benchmarks On Ultra

GPU Architecture

Core Speed902 MHzvs575 MHz
Boost Clock-vs-
ArchitectureKepler GK107-300-A2Tesla G80
OC Potential Fair vs Poor
Driver Support Good vs Poor
Release Date05 Jun 2012vs01 Nov 2006
GPU LinkGD LinkGD Link

Resolution Performance

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green tick vs
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GPU Memory

Memory2048 MBvs768 MB
Memory Speed891 MHzvs900 MHz
Memory Bus128 Bitvs384 Bit
Memory TypeDDR3vsGDDR3
Memory Bandwidth28.5GB/secvs86.4GB/sec
L2 Cache 256 KB green tick vs 0 KB
Delta Color Compression no vs no
Memory Performance 0% green tick vs green tick 0%

GPU Display

Shader Processing Units384vs128
Actual Shader Performance17%vs9%
Texture Mapping Units32vs32
Texture Rate28.9 GTexel/svs18.4 GTexel/s
Render Output Units16vs24
Pixel Rate14.4 GPixel/svs13.8 GPixel/s

GPU Outputs

Max Digital Resolution (WxH)4096x2160vs2560x1600
VGA Connections1vs0
DVI Connections1vs2
HDMI Connections1vs0
DisplayPort Connections-vs-

GPU Power Requirements

Max Power65 Wattsvs158 Watts
Recommended PSU350 Watts & 26 Ampsvs450 Watts & 30 Amps

GPU Features

Shader Model5.0vs4.0
Open GL4.5vs3.3
Open CL-vs-
Notebook GPUnono

GPU Supporting Hardware

Recommended ProcessorIntel Core i3-3220 3.3GHzvsIntel Core 2 Extreme QX6700 2.66GHz
Recommended RAM8 GBvs4 GB
Maximum Recommended Gaming Resolution1366x768vs1680x1050

Gaming Performance Value

Performance Value

GPU Mini Review

Mini ReviewOverview
GeForce GT 640 is a Middle-Class Graphics Card based on the first revision of the Kepler Architecture.

The Kepler Architecture was NVIDIA's big step to power efficiency. Each Stream Multiprocessor (SMX) now hosts 192 Shader Processing Units - against the 48 of older Fermi Architecture, and has been redesigned being now clocked at the same speed of the Central Unit. This means they are more energy efficient and will consequently lead to cooler operating temperatures. However, it also means they are weaker. It can be said that one Fermi SMX is as fast as 2 Kepler SMXs.
Additionally, and not available in all GPUs, Kepler also introduced the Boost Clock Feature. The Boost Clock is an even higher Clock Speed activated when in gaming mode and becomes the effective speed of the GPU.

It equips a GPU Codenamed GK107-300-A2 which has 2 Stream Multiprocessor activated and thus offers 384 Shader Processing Units, 32 TMUs and 16 ROPs. The Central Unit is clocked at 902MHz.

The GPU accesses a 2GB frame buffer of DDR3, through a 128-bit memory interface. The size of the frame buffer is exaggerated and in no way benefits the GPU. The Memory Clock Operates at 891MHz.

DirectX 11.0 Support (11.0 Hardware Default) and support for Optimus, CUDA, OpenCL, DirectCompute, 3D Vision Surround, PhysX, Realtime Raytracing and other technologies

Power Consumption
With a rated board TDP of 65W, it requires at least a 350W PSU and it relies entirely on the PCI Slot for power, meaning no extra connectors are required.

Gaming benchmarks put its performance on average with Radeon HD 6670.

System Suggestions
We recommend a Modest Processor (Intel Core i3) and 8GB of RAM for a system with GeForce GT 640.
GeForce 8800 GTX 768MB is a high-end GFX based on the 90nm variant of the first-shader unified architecture.
It's based on the G80 Core and offers 128 Shader Processing Units, 32 TMUs and 24 ROPs, on a 384-bit memory interface of GDDR3. The central unit runs at 576MHz and the memory clock operates 900MHz. It will consume no more than 158 Watt.
Despite being based on the same chip as 8800 GTS, it offers extra SPUs and TMUs and is not, therefore, directly related.
Today's modern demanding games can be played at medium or high settings smoothly. However, DirectX 11 based games aren't supported.
Recommended CPU
Possible GPU Upgrades
GPU Variants