Select any two GPUs for comparison
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Gaming Performance Comparison

Recommended System Requirements
Game GeForce GT 640 v3 Zotac 2GB Edition Radeon R7 7800
Halo: Reach 100% 103%
Cyberpunk 2077 765% 779%
Red Dead Redemption 2 529% 540%
Dragon Ball Z Kakarot 288% 295%
Call of Duty: Modern Warfare 529% 540%
Doom Eternal 441% 450%
Microsoft Flight Simulator 765% 779%
Grand Theft Auto VI 862% 877%
FIFA 20 235% 241%
Need For Speed Heat 529% 540%

In terms of overall gaming performance, the graphical capabilities of the Nvidia GeForce GT 640 v3 Zotac 2GB Edition are marginally better than the AMD Radeon R7 7800.

The GT 640 has a 326 MHz higher core clock speed than the Radeon R7 7800, but the Radeon R7 7800 has 16 more Texture Mapping Units than the GT 640. As a result, the Radeon R7 7800 exhibits a 6.3 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 326 MHz higher core clock speed than the Radeon R7 7800 and the same number of Render Output Units. This results in the GT 640 providing 2.6 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 Radeon R7 7800 was released over a year more recently than the GT 640, and so the Radeon R7 7800 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 GT 640 has 2048 MB video memory, but the Radeon R7 7800 does not have an entry, so the two GPUs cannot be reliably compared in this area.

The GeForce GT 640 v3 Zotac 2GB Edition has 384 Shader Processing Units and the Radeon R7 7800 has 512. However, the actual shader performance of the GT 640 is 402 and the actual shader performance of the Radeon R7 7800 is 278. The GT 640 having 124 better shader performance and an altogether better performance when taking into account other relevant data means that the GT 640 delivers a marginally smoother and more efficient experience when processing graphical data than the Radeon R7 7800.

The GeForce GT 640 v3 Zotac 2GB Edition requires 49 Watts to run and the Radeon R7 7800 requires 65 Watts. We would recommend a PSU with at least 350 Watts for the GT 640 and a PSU with at least 300 Watts for the Radeon R7 7800. The Radeon R7 7800 requires 16 Watts more than the GT 640 to run. The difference is not significant enough for the Radeon R7 7800 to have a noticeably larger impact on your yearly electricity bills than the GT 640.

Game FPS Benchmarks On Ultra

GPU Architecture

Core Speed1046 MHzvs720 MHz
Boost Clock-vs836 MHz
ArchitectureKepler GK208-400-A1Kaveri Spectre
OC Potential Poor vs None
Driver Support Good vs -
Release Date29 May 2013vs30 Jun 2014
GPU LinkGD LinkGD Link
Approved
Comparison

Resolution Performance

1366x768 - green tick vs green tick -
1600x900
5.2
green tick vs -
1920x1080
3.9
green tick vs -
2560x1440
2.6
green tick vs -
3840x2160
1.8
green tick vs -

GPU Memory

Memory2048 MBvsN/A
Memory Speed1252 MHzvs1067 MHz
Memory Bus64 Bitvs128 Bit
Memory TypeGDDR5vsDDR3
Memory Bandwidth40.1GB/secvs34.1GB/sec
L2 Cache 128 KB green tick vs -
Delta Color Compression no vs no
Memory Performance 0% green tick vs green tick 0%
Comparison

GPU Display

Shader Processing Units384vs512
Actual Shader Performance19%vs13%
Technology28nmvs28nm
Texture Mapping Units16vs32
Texture Rate16.7 GTexel/svs23 GTexel/s
Render Output Units8vs8
Pixel Rate8.4 GPixel/svs5.8 GPixel/s
Comparison

GPU Outputs

Max Digital Resolution (WxH)4096x2160vs4096x2160
VGA Connections1vs0
DVI Connections1vs0
HDMI Connections1vs0
DisplayPort Connections-vs-
Comparison

GPU Power Requirements

Max Power49 Wattsvs65 Watts
Recommended PSU350 Watts & 26 Ampsvs300 Watts & 18 Amps

GPU Features

DirectX12.0vs11.2
Shader Model5.0vs5.0
Open GL4.5vs4.3
Open CL-vs-
Notebook GPUnono
SLI/Crossfirenovsno
Dedicatedyesvsno
Comparison

GPU Supporting Hardware

Recommended ProcessorIntel Core i3-3220 3.3GHzvsAMD APU A10-7800 Quad-Core
Recommended RAM8 GBvs4 GB
Maximum Recommended Gaming Resolution1366x768vs1366x768

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.

Performance
Without Overclocking Out of The Box, GeForce GT 640 v3 Zotac 2GB Edition is as fast as the reference GeForce GT 640 v3.
Radeon R7 7800 is an integrated Graphics Card in the A10-7800.
It is based on the Graphics Core Next Architecture and offers 512 Shader Processing Units, 32 TMUs and 8 ROPs. The memory bus-width will depend on whether or not the system's RAM is dual-channeled and the operating memory clock, on its frequency. Thus, it can be either 64-bit or 128-bit and up to 1067MHz.
Therefore, the Graphics Card's performance depends a lot on the system configuration. Best case scenario, expect performance similar to Intel's powerful Iris Pro Graphics 5200.
The card is thus suited for 720p gaming and most modern demanding games can be played at least on medium settings.
Recommended CPU
Possible GPU Upgrades
-
GPU Variants
-
-

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