Select any two GPUs for comparison

Gaming Performance Comparison

Recommended System Requirements
Game GeForce GT 640 Radeon R7 250 v2 Sapphire 2GB Edition
Hitman 3 880% 686%
Cyberpunk 2077 653% 504%
Assassins Creed: Valhalla 589% 453%
FIFA 21 280% 205%
Grand Theft Auto VI 960% 750%
Call of Duty: Black Ops Cold War 567% 435%
Resident Evil 8 653% 504%
Genshin Impact 653% 504%
Far Cry 6 990% 774%
The Medium 840% 654%

In terms of overall gaming performance, the graphical capabilities of the AMD Radeon R7 250 v2 Sapphire 2GB Edition are noticeably better than the Nvidia GeForce GT 640.

The R7 250 has a 98 MHz higher core clock speed than the GeForce GT 640, but the GeForce GT 640 has 8 more Texture Mapping Units than the R7 250. As a result, the GeForce GT 640 exhibits a 4.9 GTexel/s better Texture Fill Rate than the R7 250. This still holds weight but shader performance is generally more relevant, particularly since both of these GPUs support at least DirectX 10.

The R7 250 has a 98 MHz higher core clock speed than the GeForce GT 640, but the GeForce GT 640 has 8 more Render Output Units than the R7 250. As a result, the GeForce GT 640 exhibits a 6.4 GPixel/s better Pixel Fill Rate than the R7 250. However, both GPUs support DirectX 9 or above, and pixeling performance is only really relevant when comparing older cards.

The R7 250 was released over a year more recently than the GeForce GT 640, and so the R7 250 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 and the Radeon R7 250 v2 Sapphire 2GB Edition have the same amount of video memory, but are likely to provide slightly different experiences when displaying game textures at high resolutions.

The R7 250 has 0.3 GB/sec greater memory bandwidth than the GeForce GT 640, which means that the memory performance of the R7 250 is marginally better than the GeForce GT 640.

Both the GeForce GT 640 and the Radeon R7 250 v2 Sapphire 2GB Edition 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 R7 250 is 343. 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 GeForce GT 640 requires 65 Watts to run and the Radeon R7 250 v2 Sapphire 2GB Edition requires 65 Watts. We would recommend a PSU with at least 350 Watts for the GeForce GT 640 and a PSU with at least 400 Watts for the R7 250. The two GPUs require the same amount of wattage to run. As such, there is no need to worry about which will more significantly affect your yearly electricity bills.

Game FPS Benchmarks On Ultra

GPU Architecture

Core Speed902 MHzvs1000 MHz
Boost Clock-vs1050 MHz
ArchitectureKepler GK107-300-A2GCN 1.1 Oland XT
OC Potential Fair vs Poor
Driver Support Good vs Great
Release Date05 Jun 2012vs09 Oct 2013
GPU LinkGD LinkGD Link

Resolution Performance

green tick vs -
vs green tick
vs green tick
vs green tick
green tick vs green tick

GPU Memory

Memory2048 MBvs2048 MB
Memory Speed891 MHzvs900 MHz
Memory Bus128 Bitvs128 Bit
Memory TypeDDR3vsDDR3
Memory Bandwidth28.5GB/secvs28.8GB/sec
L2 Cache 256 KB vs green tick 512 KB
Delta Color Compression no vs no
Memory Performance 0% green tick vs green tick 0%

GPU Display

Shader Processing Units384vs384
Actual Shader Performance17%vs17%
Texture Mapping Units32vs24
Texture Rate28.9 GTexel/svs24 GTexel/s
Render Output Units16vs8
Pixel Rate14.4 GPixel/svs8 GPixel/s

GPU Outputs

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

GPU Power Requirements

Max Power65 Wattsvs65 Watts
Recommended PSU350 Watts & 26 Ampsvs400 Watts & 18 Amps

GPU Features

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

GPU Supporting Hardware

Recommended ProcessorIntel Core i3-3220 3.3GHzvsIntel Core i3-4130 3.4GHz
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.

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 R7 250 Sapphire 2GB DDR3 Edition is a special edition of the middle-class Radeon R7 250 v2 2GB.
This edition is essentially a reference card with no overclock out of the box and thus there is no performance boost over the standard edition.
Recommended CPU
Possible GPU Upgrades
GPU Variants