Select any two GPUs for comparison

Gaming Performance Comparison

Recommended System Requirements
Game GeForce GT 640 v3 Zotac 2GB Edition Radeon HD 6750
Red Dead Redemption 2 529% 463%
Halo: Reach 100% 79%
Cyberpunk 2077 765% 674%
Call of Duty: Modern Warfare 529% 463%
Doom Eternal 441% 384%
Microsoft Flight Simulator 765% 674%
Grand Theft Auto VI 862% 761%
Dragon Ball Z Kakarot 288% 247%
Star Wars: Jedi - Fallen Order 765% 674%
Need For Speed Heat 529% 463%

In terms of overall gaming performance, the graphical capabilities of the AMD Radeon HD 6750 are very slightly better than the Nvidia GeForce GT 640 v3 Zotac 2GB Edition.

The GT 640 has a 346 MHz higher core clock speed than the Radeon HD 6750, but the Radeon HD 6750 has 20 more Texture Mapping Units than the GT 640. As a result, the Radeon HD 6750 exhibits a 8.5 GTexel/s better Texture Fill Rate than the GT 640. 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 346 MHz higher core clock speed than the Radeon HD 6750, but the Radeon HD 6750 has 8 more Render Output Units than the GT 640. As a result, the Radeon HD 6750 exhibits a 2.8 GPixel/s better Pixel Fill Rate than the GT 640. However, both GPUs support DirectX 9 or above, and pixeling performance is only really relevant when comparing older cards.

The GT 640 was released over a year more recently than the Radeon HD 6750, and so the GT 640 is likely to have better driver support, meaning it will be more optimized for running the latest games when compared to the Radeon HD 6750.

The GT 640 has 1024 MB more video memory than the Radeon HD 6750, so is likely to be much better at displaying game textures at higher resolutions. However, the overall memory performance is about the same.

The Radeon HD 6750 has 33.5 GB/sec greater memory bandwidth than the GT 640, which means that the memory performance of the Radeon HD 6750 is noticeably better than the GT 640.

The GeForce GT 640 v3 Zotac 2GB Edition has 384 Shader Processing Units and the Radeon HD 6750 has 720. However, the actual shader performance of the GT 640 is 402 and the actual shader performance of the Radeon HD 6750 is 252. The GT 640 having 150 better shader performance is not particularly notable, as altogether the Radeon HD 6750 performs better when taking into account other relevant data.

The GT 640 transistor size technology is 12 nm (nanometers) smaller than the Radeon HD 6750. This means that the GT 640 is expected to run slightly cooler and achieve higher clock frequencies than the Radeon HD 6750.

The GeForce GT 640 v3 Zotac 2GB Edition requires 49 Watts to run and the Radeon HD 6750 requires 86 Watts. We would recommend a PSU with at least 350 Watts for the GT 640 and a PSU with at least 450 Watts for the Radeon HD 6750. The Radeon HD 6750 requires 37 Watts more than the GT 640 to run. The difference is significant enough that the Radeon HD 6750 may have a slight adverse affect on your yearly electricity bills in comparison to the GT 640.

Game FPS Benchmarks On Ultra

GPU Architecture

Core Speed1046 MHzvs700 MHz
Boost Clock-vs-
ArchitectureKepler GK208-400-A1Terascale 2 Juniper PRO
OC Potential Poor vs Fair
Driver Support Good vs Poor
Release Date29 May 2013vs21 Jan 2011
GPU LinkGD LinkGD Link

Resolution Performance

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

GPU Memory

Memory2048 MBvs1024 MB
Memory Speed1252 MHzvs1150 MHz
Memory Bus64 Bitvs128 Bit
Memory TypeGDDR5vsGDDR5
Memory Bandwidth40.1GB/secvs73.6GB/sec
L2 Cache 128 KB vs green tick 256 KB
Delta Color Compression no vs no
Memory Performance 0% green tick vs green tick 0%

GPU Display

Shader Processing Units384vs720
Actual Shader Performance19%vs12%
Texture Mapping Units16vs36
Texture Rate16.7 GTexel/svs25.2 GTexel/s
Render Output Units8vs16
Pixel Rate8.4 GPixel/svs11.2 GPixel/s

GPU Outputs

Max Digital Resolution (WxH)4096x2160vs2560x1600
VGA Connections1vs0
DVI Connections1vs2
HDMI Connections1vs1
DisplayPort Connections-vs-

GPU Power Requirements

Max Power49 Wattsvs86 Watts
Recommended PSU350 Watts & 26 Ampsvs450 Watts & 18 Amps

GPU Features

Shader Model5.0vs5.0
Open GL4.5vs4.3
Open CL-vs-
Notebook GPUnono

GPU Supporting Hardware

Recommended ProcessorIntel Core i3-3220 3.3GHzvsIntel Core i3-530 2.9GHz
Recommended RAM8 GBvs4 GB
Maximum Recommended Gaming Resolution1366x768vs1600x900

Gaming Performance Value

Performance Value

GPU Mini Review

Mini ReviewOverview
GeForce GT 640 v3 Zotac 2GB Edition is a special edition of NVIDIA's Middle-Class GeForce GT 640 v3, created by Zotac.

Overclock: Central Unit
The Central Unit runs at the same speed.

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

Cooling Solution
The Cooling System has been replaced by Zotac's Silent Cooling Solution.

Without Overclocking Out of The Box, GeForce GT 640 v3 Zotac 2GB Edition is as fast as the reference GeForce GT 640 v3.
Radeon HD 6750 is a fast-middle-class Graphics Card based on the second revision of the Terascale Architecture.

The Second variant of the Terascale 2 Architecture is still manufactured with a 40nm technology and despite allowing more Stream Cores, their design remains more or less the same compared to the first variant.

It equips a GPU codenamed Juniper PRO which has 9 Compute Units activated and thus offers 720 Shader Processing Units, 36 TMUs and 16 ROPs.

The GPU accesses a 1GB frame buffer of fast GDDR5, through a 128-bit memory interface. The memory clock operates at 1150MHz. The size of the frame buffer is adequate.

DirectX 11.0 Support (11.0 Hardware Default) and support for Crossfire, HD3D, Eyefinity, App Acceleration, PowerPlay and other technologies.

Cooling Solution
The Cooling Solution consists of a Single-Fan.

Power Consumption
With a rated board TDP of 86W, it requires at least a 450W PSU with one available 6-pin connectors.

Gaming benchmarks put its performance only slightly below GeForce GTS 450, meaning GeForce GTX 550 Ti is still considerably faster.

System Suggestions
We recommend a modest processor (Intel Core i3/AMD Phenom) and 4GB of RAM for a system with Radeon HD 6750.
Recommended CPU
Possible GPU Upgrades
GPU Variants