Select any two GPUs for comparison

Gaming Performance Comparison

Recommended System Requirements
Game GeForce GT 640 Radeon HD 3870
Cyberpunk 2077 653% 867%
Hitman 3 880% 1157%
Assassins Creed: Valhalla 589% 784%
Resident Evil 8 653% 867%
FIFA 21 280% 388%
Grand Theft Auto VI 960% 1260%
Call of Duty: Black Ops Cold War 567% 755%
Genshin Impact 653% 867%
The Medium 840% 1106%
Far Cry 6 990% 1299%

In terms of overall gaming performance, the graphical capabilities of the Nvidia GeForce GT 640 are noticeably better than the AMD Radeon HD 3870.

The GeForce GT 640 has a 125 MHz higher core clock speed and 16 more Texture Mapping Units than the Radeon HD 3870. This results in the GeForce GT 640 providing 16.5 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 125 MHz higher core clock speed than the Radeon HD 3870 and the same number of Render Output Units. This results in the GeForce GT 640 providing 2 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 Radeon HD 3870, 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 Radeon HD 3870 when running the latest games.

The GeForce GT 640 has 1536 MB more video memory than the Radeon HD 3870, so is likely to be much better at displaying game textures at higher resolutions. However, overall, the Radeon HD 3870 has superior memory performance.

The Radeon HD 3870 has 43.6 GB/sec greater memory bandwidth than the GeForce GT 640, which means that the memory performance of the Radeon HD 3870 is noticeably better than the GeForce GT 640.

The GeForce GT 640 has 384 Shader Processing Units and the Radeon HD 3870 has 320. However, the actual shader performance of the GeForce GT 640 is 346 and the actual shader performance of the Radeon HD 3870 is 249. The GeForce GT 640 having 97 better shader performance is not particularly notable, as altogether the Radeon HD 3870 performs better when taking into account other relevant data.

The GeForce GT 640 transistor size technology is 27 nm (nanometers) smaller than the Radeon HD 3870. This means that the GeForce GT 640 is expected to run slightly cooler and achieve higher clock frequencies than the Radeon HD 3870.

The GeForce GT 640 requires 65 Watts to run and the Radeon HD 3870 requires 106 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 Radeon HD 3870. The Radeon HD 3870 requires 41 Watts more than the GeForce GT 640 to run. The difference is significant enough that the Radeon HD 3870 may have a slight adverse affect on your yearly electricity bills in comparison to the GeForce GT 640.

Game FPS Benchmarks On Ultra

GPU Architecture

Core Speed902 MHzvs777 MHz
Boost Clock-vs-
ArchitectureKepler GK107-300-A2R600 RV670 XT
OC Potential Fair vs Poor
Driver Support Good vs Discontinued
Release Date05 Jun 2012vs19 Nov 2007
GPU LinkGD LinkGD Link

Resolution Performance

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GPU Memory

Memory2048 MBvs512 MB
Memory Speed891 MHzvs1126 MHz
Memory Bus128 Bitvs256 Bit
Memory TypeDDR3vsGDDR4
Memory Bandwidth28.5GB/secvs72.1GB/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 Units384vs320
Actual Shader Performance17%vs12%
Texture Mapping Units32vs16
Texture Rate28.9 GTexel/svs12.4 GTexel/s
Render Output Units16vs16
Pixel Rate14.4 GPixel/svs12.4 GPixel/s

GPU Outputs

Max Digital Resolution (WxH)4096x2160vs2560x1600
VGA Connections1vs1
DVI Connections1vs1
HDMI Connections1vs1
DisplayPort Connections-vs0

GPU Power Requirements

Max Power65 Wattsvs106 Watts
Recommended PSU350 Watts & 26 Ampsvs450 Watts & 28 Amps

GPU Features

Shader Model5.0vs4.1
Open GL4.5vs3.3
Open CL-vs-
Notebook GPUnono

GPU Supporting Hardware

Recommended ProcessorIntel Core i3-3220 3.3GHzvsIntel Core 2 Duo E6850 3.0GHz
Recommended RAM8 GBvs4 GB
Maximum Recommended Gaming Resolution1366x768vs1440x900

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.
Radeon HD 3870 is a high-end GPU based on the 55nm, second unified shader architecture, R600.
It's based on the RV670 XT Core and offers 320 Shader Processing Units, 16 TMUs and 16 ROPs a 256-bit memory interface of energy efficient GDDR4. The central unit runs at 777MHz and the memory clock runs at up to 1126MHz.
Compared to Radeon HD 3850, it offers extra bandwidth (thanks to the higher operating memory clock resultant from using GDDR4) and the central unit is higher clocked. However, it also consumes up to around extra 30W. This value would be higher were standard GDDR3 used.
Today's modern games should run fluently at medium settings but with modest resolutions. DirectX 11 games aren't supported.
Recommended CPU
Possible GPU Upgrades
GPU Variants