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Gaming Performance Comparison

Recommended System Requirements
Game GeForce GT 640 Gigabyte OC 2GB Edition Radeon HD 7870 PCS+ Vortex II Edition
Cyberpunk 2077 598% 103%
Assassins Creed: Valhalla 538% 86%
Call of Duty: Black Ops Cold War 517% 80%
FIFA 21 252% 2%
Microsoft Flight Simulator 517% 80%
World of Warcraft: Shadowlands 900% 191%
Watch Dogs Legion 573% 96%
Horizon: Zero Dawn 560% 92%
Grand Theft Auto VI 881% 186%
Genshin Impact 598% 103%

In terms of overall gaming performance, the graphical capabilities of the AMD Radeon HD 7870 PCS+ Vortex II Edition are massively better than the Nvidia GeForce GT 640 Gigabyte OC 2GB Edition.

The HD 7870 has a 100 MHz higher core clock speed and 48 more Texture Mapping Units than the GT 640. This results in the HD 7870 providing 58.4 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 7870 has a 100 MHz higher core clock speed and 16 more Render Output Units than the GT 640. This results in the HD 7870 providing 20 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 HD 7870 was released less than a year after the GT 640, and so they are likely to have similar driver support for optimizing performance when running the latest games.

The GeForce GT 640 Gigabyte OC 2GB Edition and the Radeon HD 7870 PCS+ Vortex II Edition have the same amount of video memory, but are likely to provide slightly different experiences when displaying game textures at high resolutions.

The HD 7870 has 131.2 GB/sec greater memory bandwidth than the GT 640, which means that the memory performance of the HD 7870 is massively better than the GT 640.

The GeForce GT 640 Gigabyte OC 2GB Edition has 384 Shader Processing Units and the Radeon HD 7870 PCS+ Vortex II Edition has 1280. However, the actual shader performance of the GT 640 is 403 and the actual shader performance of the HD 7870 is 1251. The HD 7870 having 848 better shader performance and an altogether better performance when taking into account other relevant data means that the HD 7870 delivers a massively smoother and more efficient experience when processing graphical data than the GT 640.

The GeForce GT 640 Gigabyte OC 2GB Edition requires 65 Watts to run but there is no entry for the Radeon HD 7870 PCS+ Vortex II 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 7870. The HD 7870 has been recommended a PSU with 150 Watts more than the GT 640. The difference is significant enough that the HD 7870 may have an adverse affect on your yearly electricity bills in comparison to the GT 640.

Game FPS Benchmarks On Ultra

GPU Architecture

Core Speed1050 MHzvs1150 MHz
Boost Clock-vs-
ArchitectureKepler GK107-300-A2GCN 1.0 Pitcairn XT
OC Potential Poor vs Poor
Driver Support Good vs Good
Release Date05 Jun 2012vs01 Sep 2012
GPU LinkGD LinkGD Link
Approved
Comparison

Resolution Performance

1366x768 - green tick vs green tick -
1600x900
5.3
vs green tick
9.5
1920x1080
3.8
vs green tick
7.5
2560x1440
2.6
vs green tick
5.5
3840x2160
1.8
vs green tick
3.9

GPU Memory

Memory2048 MBvs2048 MB
Memory Speed900 MHzvs1250 MHz
Memory Bus128 Bitvs256 Bit
Memory TypeDDR3vsGDDR5
Memory Bandwidth28.8GB/secvs160GB/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 Units384vs1280
Actual Shader Performance19%vs60%
Technology28nmvs28nm
Texture Mapping Units32vs80
Texture Rate33.6 GTexel/svs92 GTexel/s
Render Output Units16vs32
Pixel Rate16.8 GPixel/svs36.8 GPixel/s
Comparison

GPU Outputs

Max Digital Resolution (WxH)4096x2160vs4096x2160
VGA Connections1vs0
DVI Connections2vs2
HDMI Connections1vs1
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/Crossfireyesvsyes
Dedicatedyesvsyes
Comparison

GPU Supporting Hardware

Recommended ProcessorIntel Core i3-3220 3.3GHzvsIntel Core i5-3570K 3.4GHz
Recommended RAM8 GBvs8 GB
Maximum Recommended Gaming Resolution1366x768vs1920x1080

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.

Performance
Benchmarks indicate a 8% performance over the reference GeForce GT 640.
Radeon HD 7870 PCS+ Vortex II Edition is a special edition of Radeon HD 7870.
This is one of today's most powerful editions of the reference as it features increases in both the core and memory clocks that went from 1000MHz to 1150MHz and from 1200MHz to 1250MHz.
Benchmarks indicate the performance boost is quite extreme and around 8% when compared to the reference Radeon HD 7870.
Recommended CPU
Possible GPU Upgrades
GPU Variants
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