Select any two GPUs for comparison
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Gaming Performance Comparison

Recommended System Requirements
Game GeForce GT 640 Radeon R7 7850K
Cyberpunk 2077 653% 549%
Assassins Creed: Valhalla 589% 494%
Call of Duty: Black Ops Cold War 567% 475%
Hitman 3 880% 745%
Grand Theft Auto VI 960% 814%
FIFA 21 280% 228%
Far Cry 6 990% 840%
Genshin Impact 653% 549%
World of Warcraft: Shadowlands 980% 831%
Watch Dogs Legion 627% 526%

In terms of overall gaming performance, the graphical capabilities of the AMD Radeon R7 7850K are very slightly better than the Nvidia GeForce GT 640.

The GeForce GT 640 has a 172 MHz higher core clock speed and the same number of Texture Mapping Units as the Radeon R7 7850K. This results in the GeForce GT 640 providing 5.5 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 172 MHz higher core clock speed and 8 more Render Output Units than the Radeon R7 7850K. This results in the GeForce GT 640 providing 8.6 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 Radeon R7 7850K was released over a year more recently than the GeForce GT 640, and so the Radeon R7 7850K is likely to have better driver support, meaning it will be more optimized for running the latest games when compared to the GeForce GT 640.

The GeForce GT 640 has 2048 MB video memory, but the Radeon R7 7850K does not have an entry, so the two GPUs cannot be reliably compared in this area.

The GeForce GT 640 has 384 Shader Processing Units and the Radeon R7 7850K has 512. However, the actual shader performance of the GeForce GT 640 is 346 and the actual shader performance of the Radeon R7 7850K is 278. The GeForce GT 640 having 68 better shader performance is not particularly notable, as altogether the Radeon R7 7850K performs better when taking into account other relevant data.

The GeForce GT 640 requires 65 Watts to run and the Radeon R7 7850K requires 95 Watts. We would recommend a PSU with at least 350 Watts for the GeForce GT 640 and a PSU with at least 300 Watts for the Radeon R7 7850K. The Radeon R7 7850K requires 30 Watts more than the GeForce GT 640 to run. The difference is not significant enough for the Radeon R7 7850K to have a noticeably larger impact on your yearly electricity bills than the GeForce GT 640.

Game FPS Benchmarks On Ultra

GPU Architecture

Core Speed902 MHzvs730 MHz
Boost Clock-vs836 MHz
ArchitectureKepler GK107-300-A2Kaveri Spectre
OC Potential Fair vs None
Driver Support Good vs -
Release Date05 Jun 2012vs14 Jan 2014
GPU LinkGD LinkGD Link
Approved
Comparison

Resolution Performance

1366x768
6.6
green tick vs -
1600x900
5.1
green tick vs -
1920x1080
3.5
green tick vs -
2560x1440
2.5
green tick vs -
3840x2160
1.7
green tick vs -

GPU Memory

Memory2048 MBvsN/A
Memory Speed891 MHzvs1067 MHz
Memory Bus128 Bitvs128 Bit
Memory TypeDDR3vsDDR3
Memory Bandwidth28.5GB/secvs34.1GB/sec
L2 Cache 256 KB vs green tick 4096 KB
Delta Color Compression no vs no
Memory Performance 0% green tick vs green tick 0%
Comparison

GPU Display

Shader Processing Units384vs512
Actual Shader Performance17%vs13%
Technology28nmvs28nm
Texture Mapping Units32vs32
Texture Rate28.9 GTexel/svs23.4 GTexel/s
Render Output Units16vs8
Pixel Rate14.4 GPixel/svs5.8 GPixel/s
Comparison

GPU Outputs

Max Digital Resolution (WxH)4096x2160vs4096x2160
VGA Connections1vs0
DVI Connections1vs0
HDMI Connections1vs0
DisplayPort Connections-vs-
Comparison

GPU Power Requirements

Max Power65 Wattsvs95 Watts
Recommended PSU350 Watts & 26 Ampsvs300 Watts & 12 Amps

GPU Features

DirectX12.0vs11.2
Shader Model5.0vs5.0
Open GL4.5vs4.3
Open CL-vs-
Notebook GPUnono
SLI/Crossfirenovsno
Dedicatedyesvsno
Comparison

GPU Supporting Hardware

Recommended ProcessorIntel Core i3-3220 3.3GHzvsAMD APU A10-7850K Quad-Core
Recommended RAM8 GBvs4 GB
Maximum Recommended Gaming Resolution1366x768vs1366x768

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.

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.

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.

Memory
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.

Features
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.

Performance
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 R7 7850K is an integrated Graphics Card in the APU A10-7850K.

It is based on the Graphics Core Next Architecture and offers 512 Shader Processing Units, 32 TMUs and 8 ROPs. The memory bus-width will depend on whether or not the system's RAM is dual-channeled and the operating memory clock, on its frequency. Thus, it can be either 64-bit or 128-bit and up to 1067MHz.
The Graphics Card also shares the processor's L2 Cache of 4MB, reducing the impact of its low memory bandwidth.

Overall, the Graphics Card's performance depends a lot on the system configuration. Best case scenario, expect performance superior to Intel's powerful Iris Pro Graphics 5200 and almost similar to the dedicated Radeon HD 7750.
The card is thus suited for 720p gaming and most modern demanding games can be played at least on medium settings.
Recommended CPU
Possible GPU Upgrades
-
GPU Variants
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