Select any two GPUs for comparison
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Gaming Performance Comparison

Recommended System Requirements
Game GeForce GT 640 v3 Zotac 1GB Edition GeForce GT 640 v3 Zotac 2GB Edition
Red Dead Redemption 2 529% 529%
Cyberpunk 2077 765% 765%
Dragon Ball Z Kakarot 288% 288%
Microsoft Flight Simulator 765% 765%
Call of Duty: Modern Warfare 529% 529%
Doom Eternal 441% 441%
FIFA 20 235% 235%
Grand Theft Auto VI 862% 862%
Need For Speed Heat 529% 529%
Halo: Reach 100% 100%

In terms of overall gaming performance, the graphical capabilities of the GT 640 and the GT 640 are equal.

The GT 640 and the GT 640 have both the same core clock speed and the same Texture Fill Rate. 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 and the GT 640 have both the same core clock speed and the same Pixel Fill Rate. However, both GPUs support DirectX 9 or above, and pixeling performance is only really relevant when comparing older cards.

Both the GeForce GT 640 v3 Zotac 1GB Edition and the GeForce GT 640 v3 Zotac 2GB Edition were released at the same time, so are likely to be quite similar.

The GT 640 has 1024 MB more video memory than the GT 640, so is likely to be much better at displaying game textures at higher resolutions. This is supported by the fact that the GT 640 also has superior memory performance overall.

The memory bandwidth of the GeForce GT 640 v3 Zotac 1GB Edition and the GeForce GT 640 v3 Zotac 2GB Edition are the same, which means the GT 640 and the GT 640 have equal limitations when it comes to graphical data transfer.

Both the GeForce GT 640 v3 Zotac 1GB Edition and the GeForce GT 640 v3 Zotac 2GB Edition have 384 Shader Processing Units. Having the same number of SPUs and using the same architecture means that the performance they offer can be compared by looking at the memory bandwidth, Texture and Pixel Rates. In this case, the two GPUs have extremely similar stats, so any gaming performance difference would most likely be negligible.

The GeForce GT 640 v3 Zotac 1GB Edition requires 49 Watts to run and the GeForce GT 640 v3 Zotac 2GB Edition requires 49 Watts. We would recommend a PSU with at least 350 Watts for the GT 640 and a PSU with at least 350 Watts for the GT 640. The two GPUs require the same amount of wattage to run. As such, there is no need to worry about which will more significantly affect your yearly electricity bills.

Game FPS Benchmarks On Ultra

GPU Architecture

Core Speed1046 MHzvs1046 MHz
Boost Clock-vs-
ArchitectureKepler GK208-400-A1Kepler GK208-400-A1
OC Potential Poor vs Poor
Driver Support Good vs Good
Release Date29 May 2013vs29 May 2013
GPU LinkGD LinkGD Link
Approved
Comparison

Resolution Performance

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

GPU Memory

Memory1024 MBvs2048 MB
Memory Speed1252 MHzvs1252 MHz
Memory Bus64 Bitvs64 Bit
Memory TypeGDDR5vsGDDR5
Memory Bandwidth40.1GB/secvs40.1GB/sec
L2 Cache 128 KB green tick vs green tick 128 KB
Delta Color Compression no vs no
Memory Performance 0% green tick vs green tick 0%
Comparison

GPU Display

Shader Processing Units384vs384
Actual Shader Performance19%vs19%
Technology28nmvs28nm
Texture Mapping Units16vs16
Texture Rate16.7 GTexel/svs16.7 GTexel/s
Render Output Units8vs8
Pixel Rate8.4 GPixel/svs8.4 GPixel/s
Comparison

GPU Outputs

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

GPU Power Requirements

Max Power49 Wattsvs49 Watts
Recommended PSU350 Watts & 26 Ampsvs350 Watts & 26 Amps

GPU Features

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

GPU Supporting Hardware

Recommended ProcessorIntel Core i3-3220 3.3GHzvsIntel Core i3-3220 3.3GHz
Recommended RAM8 GBvs8 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 Remains the same and the Frame Buffer was halved to 1GB which is adequate for the Graphics Card and will not decrease its performance.

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 1GB Edition is as fast as the reference GeForce GT 640 v3.
Overview
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.
Recommended CPU
Possible GPU Upgrades
GPU Variants
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