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Gaming Performance Comparison

Recommended System Requirements
Game GeForce GT 640 Zotac Synergy 2GB Edition Radeon HD 7850 XFX Ultra OC Edition
Cyberpunk 2077 653% 154%
Assassins Creed: Valhalla 589% 133%
Call of Duty: Black Ops Cold War 567% 125%
Hitman 3 880% 231%
Grand Theft Auto VI 960% 258%
FIFA 21 280% 28%
Far Cry 6 990% 268%
Genshin Impact 653% 154%
World of Warcraft: Shadowlands 980% 265%
Watch Dogs Legion 627% 145%

In terms of overall gaming performance, the graphical capabilities of the AMD Radeon HD 7850 XFX Ultra OC Edition are massively better than the Nvidia GeForce GT 640 Zotac Synergy 2GB Edition.

The HD 7850 has a 75 MHz higher core clock speed and 32 more Texture Mapping Units than the GT 640. This results in the HD 7850 providing 33.6 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 HD 7850 has a 75 MHz higher core clock speed and 16 more Render Output Units than the GT 640. This results in the HD 7850 providing 16.8 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 GT 640 was released less than a year after the HD 7850, and so they are likely to have similar driver support for optimizing performance when running the latest games.

The GT 640 has 1024 MB more video memory than the HD 7850, so is likely to be much better at displaying game textures at higher resolutions. However, overall, the HD 7850 has superior memory performance.

The HD 7850 has 128 GB/sec greater memory bandwidth than the GT 640, which means that the memory performance of the HD 7850 is massively better than the GT 640.

The GeForce GT 640 Zotac Synergy 2GB Edition has 384 Shader Processing Units and the Radeon HD 7850 XFX Ultra OC Edition has 1024. However, the actual shader performance of the GT 640 is 346 and the actual shader performance of the HD 7850 is 849. The HD 7850 having 503 better shader performance and an altogether better performance when taking into account other relevant data means that the HD 7850 delivers a massively smoother and more efficient experience when processing graphical data than the GT 640.

The GeForce GT 640 Zotac Synergy 2GB Edition requires 65 Watts to run but there is no entry for the Radeon HD 7850 XFX Ultra OC Edition. We would recommend a PSU with at least 350 Watts for the GT 640 and a PSU with at least 500 Watts for the HD 7850. The HD 7850 has been recommended a PSU with 150 Watts more than the GT 640. The difference is significant enough that the HD 7850 may have an adverse affect on your yearly electricity bills in comparison to the GT 640.

Game FPS Benchmarks On Ultra

GPU Architecture

Core Speed900 MHzvs975 MHz
Boost Clock-vs-
ArchitectureKepler GK107-300-A2GCN 1.0 Pitcairn PRO
OC Potential Fair vs Fair
Driver Support Good vs Good
Release Date05 Jun 2012vs01 Jun 2012
GPU LinkGD LinkGD Link
Approved
Comparison

Resolution Performance

1366x768 - green tick vs green tick -
1600x900
5.1
vs green tick
8.5
1920x1080
3.5
vs green tick
6.6
2560x1440
2.5
vs green tick
4.9
3840x2160
1.7
vs green tick
3.1

GPU Memory

Memory2048 MBvs1024 MB
Memory Speed800 MHzvs1200 MHz
Memory Bus128 Bitvs256 Bit
Memory TypeDDR3vsGDDR5
Memory Bandwidth25.6GB/secvs153.6GB/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%
Comparison

GPU Display

Shader Processing Units384vs1024
Actual Shader Performance17%vs41%
Technology28nmvs28nm
Texture Mapping Units32vs64
Texture Rate28.8 GTexel/svs62.4 GTexel/s
Render Output Units16vs32
Pixel Rate14.4 GPixel/svs31.2 GPixel/s
Comparison

GPU Outputs

Max Digital Resolution (WxH)4096x2160vs4096x2160
VGA Connections0vs0
DVI Connections2vs2
HDMI Connections0vs1
DisplayPort Connections-vs-
Comparison

GPU Power Requirements

Max Power65 Watts-
Recommended PSU350 Watts & 26 Ampsvs500 Watts

GPU Features

DirectX12.0vs12.0
Shader Model5.0vs5.0
Open GL4.5vs4.4
Open CL-vs-
Notebook GPUnono
SLI/Crossfirenovsyes
Dedicatedyesvsyes
Comparison

GPU Supporting Hardware

Recommended ProcessorIntel Core i3-3220 3.3GHzvsIntel Core i5-3330 3.0GHz
Recommended RAM8 GBvs8 GB
Maximum Recommended Gaming Resolution1366x768vs1920x1080

Gaming Performance Value

Performance Value

GPU Mini Review

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

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

Overclock: Memory Clock
The Operating Memory Clock is now of 800MHz and the Frame Buffer remain the same.

Cooling Solution
The Cooling System remains the same.

Performance
Without Overclocking Out of The Box, GeForce GT 640 Zotac Synergy 2GB Edition is as fast as the reference GeForce GT 640.
Radeon HD 7850 XFX Ultra OC Edition is a special edition of the powerful Radeon HD 7850. See the standard version for more information about it.
The differences include an increase on the core-clock that went from 860MHz to 975MHz.
Benchmarks indicate a 7% boost when compared to the standard edition.
Recommended CPU
Possible GPU Upgrades
GPU Variants
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