Select any two GPUs for comparison

Gaming Performance Comparison

Recommended System Requirements
Game Radeon R7 7670K GeForce GT 640
Cyberpunk 2077 629% 653%
Hitman 3 848% 880%
Assassins Creed: Valhalla 567% 589%
Call of Duty: Black Ops Cold War 545% 567%
FIFA 21 268% 280%
Grand Theft Auto VI 926% 960%
Far Cry 6 955% 990%
Genshin Impact 629% 653%
World of Warcraft: Shadowlands 945% 980%
Battlefield 6 848% 880%

In terms of overall gaming performance, the graphical capabilities of the AMD Radeon R7 7670K are marginally better than the Nvidia GeForce GT 640.

The GeForce GT 640 has a 145 MHz higher core clock speed and 8 more Texture Mapping Units than the Radeon R7 7670K. This results in the GeForce GT 640 providing 10.7 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 145 MHz higher core clock speed and 8 more Render Output Units than the Radeon R7 7670K. This results in the GeForce GT 640 providing 8.3 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 Radeon R7 7670K was released over three years more recently than the GeForce GT 640, and so the Radeon R7 7670K is likely to have far better driver support, meaning it will be much more optimized and ultimately superior to the GeForce GT 640 when running the latest games.

The GeForce GT 640 has 2048 MB video memory, but the Radeon R7 7670K does not have an entry, so the two GPUs cannot be reliably compared in this area.

Both the Radeon R7 7670K and the GeForce GT 640 have 384 Shader Processing Units. While the two GPUs have the same number of SPUs, the actual performance delivered by the GeForce GT 640 is 346 and by the Radeon R7 7670K is 346. Knowing that the shader performance of the GeForce GT 640 is superior, it is not necessary to examine the GPUs' respective Texture and Pixel Fill Rates.

The Radeon R7 7670K requires 95 Watts to run and the GeForce GT 640 requires 65 Watts. We would recommend a PSU with at least 300 Watts for the Radeon R7 7670K and a PSU with at least 350 Watts for the GeForce GT 640. The Radeon R7 7670K requires 30 Watts more than the GeForce GT 640 to run. The difference is not significant enough for the Radeon R7 7670K to have a noticeably larger impact on your yearly electricity bills than the GeForce GT 640.

Game FPS Benchmarks On Ultra

GPU Architecture

Core Speed757 MHzvs902 MHz
Boost Clock-vs-
ArchitectureGCN 1.1 Godavari-KV-A1Kepler GK107-300-A2
OC Potential None vs Fair
Driver Support Good vs Good
Release Date20 Jul 2015vs05 Jun 2012
GPU LinkGD LinkGD Link

Resolution Performance

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GPU Memory

MemoryN/Avs2048 MB
Memory Speed1067 MHzvs891 MHz
Memory Bus128 Bitvs128 Bit
Memory TypeDDR3vsDDR3
Memory Bandwidth34.1GB/secvs28.5GB/sec
L2 Cache 4096 KB green tick vs 256 KB
Delta Color Compression no vs no
Memory Performance 0% green tick vs green tick 0%

GPU Display

Shader Processing Units384vs384
Actual Shader Performance12%vs17%
Texture Mapping Units24vs32
Texture Rate18.2 GTexel/svs28.9 GTexel/s
Render Output Units8vs16
Pixel Rate6.1 GPixel/svs14.4 GPixel/s

GPU Outputs

Max Digital Resolution (WxH)4096x2160vs4096x2160
VGA Connections0vs1
DVI Connections0vs1
HDMI Connections0vs1
DisplayPort Connections0vs-

GPU Power Requirements

Max Power95 Wattsvs65 Watts
Recommended PSU300 Watts & 20 Ampsvs350 Watts & 26 Amps

GPU Features

Shader Model5.0vs5.0
Open GL4.4vs4.5
Open CL-vs-
Notebook GPUnono

GPU Supporting Hardware

Recommended ProcessorAMD APU A8-7670K Quad-Core vsIntel Core i3-3220 3.3GHz
Recommended RAM4 GBvs8 GB
Maximum Recommended Gaming Resolution1366x768vs1366x768

Gaming Performance Value

Performance Value

GPU Mini Review

Mini ReviewOverview
Radeon R7 7670K is an Integrated Graphics Card in the APU A8-7670K Quad-Core .

The GCN Kaveri GPU is in every way similar to the Cape Verde GPU with the support for DirectX 11.2.

It equips a GPU Codenamed Godavari-KV-A1 which offers 384 Shader Processing Units, 24 TMUs and 8 ROPs. The Central Unit Initially Runs at 757MHz.

The GPU Shares the System's RAM which varies with each system. Typically, the GPU reserves 1GB. Depending on whether or not the system's RAM is Dual-Channeled, it can access either a 64-bit or 128-bit memory interface. The operating memory clock also depends on the at which speed the System's RAM is running and is limited by the highest operating speed that the Processor supports. In this case, it is 1067MHz.
It is then obvious the Memory Bandwidth depends on a lot of factors and thus this Graphics Card performance may vary heavily from system to system.

Gaming benchmarks put its performance almost on level with a dedicated GeForce GT 745M.

System Suggestions
We recommend 4GB of RAM for a system with Radeon R7 7670K.
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.
Recommended CPU
Possible GPU Upgrades
GPU Variants