Select any two GPUs for comparison

Gaming Performance Comparison

Recommended System Requirements
Game GeForce GT 640 Gigabyte OC 2GB Edition Radeon R7 240 2GB
Cyberpunk 2077 598% 786%
Assassins Creed: Valhalla 538% 711%
Call of Duty: Black Ops Cold War 517% 684%
Grand Theft Auto VI 881% 1147%
FIFA 21 252% 347%
Genshin Impact 598% 786%
Far Cry 6 909% 1182%
Hitman 3 807% 1053%
Watch Dogs Legion 573% 755%
World of Warcraft: Shadowlands 900% 1171%

In terms of overall gaming performance, the graphical capabilities of the Nvidia GeForce GT 640 Gigabyte OC 2GB Edition are noticeably better than the AMD Radeon R7 240 2GB.

The GT 640 has a 320 MHz higher core clock speed and 12 more Texture Mapping Units than the R7 240. This results in the GT 640 providing 19 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 GT 640 has a 320 MHz higher core clock speed and 8 more Render Output Units than the R7 240. This results in the GT 640 providing 11 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 R7 240 was released over a year more recently than the GT 640, and so the R7 240 is likely to have better driver support, meaning it will be more optimized for running the latest games when compared to the GT 640.

The GeForce GT 640 Gigabyte OC 2GB Edition and the Radeon R7 240 2GB have the same amount of video memory, but are likely to provide slightly different experiences when displaying game textures at high resolutions.

The memory bandwidth of the GeForce GT 640 Gigabyte OC 2GB Edition and the Radeon R7 240 2GB are the same, which means the GT 640 and the R7 240 have equal limitations when it comes to graphical data transfer.

The GeForce GT 640 Gigabyte OC 2GB Edition has 384 Shader Processing Units and the Radeon R7 240 2GB has 320. However, the actual shader performance of the GT 640 is 403 and the actual shader performance of the R7 240 is 212. The GT 640 having 191 better shader performance and an altogether better performance when taking into account other relevant data means that the GT 640 delivers a slightly smoother and more efficient experience when processing graphical data than the R7 240.

The GeForce GT 640 Gigabyte OC 2GB Edition requires 65 Watts to run and the Radeon R7 240 2GB requires 30 Watts. We would recommend a PSU with at least 350 Watts for the GT 640 and a PSU with at least 400 Watts for the R7 240. The GT 640 requires 35 Watts more than the R7 240 to run. The difference is significant enough that the GT 640 may have a slight adverse affect on your yearly electricity bills in comparison to the R7 240.

Game FPS Benchmarks On Ultra

GPU Architecture

Core Speed1050 MHzvs730 MHz
Boost Clock-vs780 MHz
ArchitectureKepler GK107-300-A2GCN 1.1 Oland PRO
OC Potential Poor vs Good
Driver Support Good vs Great
Release Date05 Jun 2012vs08 Oct 2013
GPU LinkGD LinkGD Link

Resolution Performance

1366x768 - vs green tick
green tick vs
green tick vs
green tick vs
green tick vs

GPU Memory

Memory2048 MBvs2048 MB
Memory Speed900 MHzvs900 MHz
Memory Bus128 Bitvs128 Bit
Memory TypeDDR3vsDDR3
Memory Bandwidth28.8GB/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 Units384vs320
Actual Shader Performance19%vs10%
Texture Mapping Units32vs20
Texture Rate33.6 GTexel/svs14.6 GTexel/s
Render Output Units16vs8
Pixel Rate16.8 GPixel/svs5.8 GPixel/s

GPU Outputs

Max Digital Resolution (WxH)4096x2160vs4096x2160
VGA Connections1vs1
DVI Connections2vs1
HDMI Connections1vs1
DisplayPort Connections-vs-

GPU Power Requirements

Max Power65 Wattsvs30 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 Gigabyte OC 2GB Edition is a special edition of NVIDIA's Middle-Class GeForce GT 640, created by Gigabyte.

Overclock: Central Unit
The Central Unit now runs at 1050MHz, instead of 902MHz.

Overclock: Memory Clock
The Operating Memory Clock and the Frame Buffer remain the same.

Cooling Solution
The Cooling System remains the same.

Benchmarks indicate a 8% performance over the reference GeForce GT 640.
Note: This Graphics Card has 2 variants: one with DDR3 and another with GDDR5. This is the DDR3 Version.

Radeon R7 240 2GB offers a core codenamed Oland PRO and thus features 320 Shader Processing Units, 20 TMUs and 8 ROPs, on a 128-bit bus width of standard DDR3. While the central unit runs at 730MHz and goes up to 780MHz, in Turbo Mode, the memory clock operates at 900MHz.
With a rated board TDP of 30W, it requires no extra power connectors.

Compared to Radeon R7 250, its performance is significantly lower (over 25% slower), especially at higher resolutions due to the limited memory bandwidth. Still, the TDP is relatively low and so this card may be used on low end systems and offer a reasonable upgrade, when compared to integrated graphics.
Recommended CPU
Possible GPU Upgrades
GPU Variants