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Gaming Performance Comparison

Recommended System Requirements
Game GeForce GT 640 v3 Zotac 2GB Edition Radeon HD 4850 Sapphire Vapor-X Edition
Red Dead Redemption 2 529% 438%
Halo: Reach 100% 71%
Cyberpunk 2077 765% 639%
Call of Duty: Modern Warfare 529% 438%
Doom Eternal 441% 363%
Microsoft Flight Simulator 765% 639%
Warcraft 3: Reforged 76% 79%
Grand Theft Auto VI 862% 722%
Star Wars: Jedi - Fallen Order 765% 639%
Dragon Ball Z Kakarot 288% 232%

In terms of overall gaming performance, the graphical capabilities of the AMD Radeon HD 4850 Sapphire Vapor-X Edition are very slightly better than the Nvidia GeForce GT 640 v3 Zotac 2GB Edition.

The GT 640 has a 396 MHz higher core clock speed than the HD 4850, but the HD 4850 has 24 more Texture Mapping Units than the GT 640. As a result, the HD 4850 exhibits a 9.3 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 396 MHz higher core clock speed than the HD 4850, but the HD 4850 has 8 more Render Output Units than the GT 640. As a result, the HD 4850 exhibits a 2 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 HD 4850, 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 HD 4850.

The GT 640 has 1024 MB more video memory than the HD 4850, 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 HD 4850 has 23.9 GB/sec greater memory bandwidth than the GT 640, which means that the memory performance of the HD 4850 is slightly better than the GT 640.

The GeForce GT 640 v3 Zotac 2GB Edition has 384 Shader Processing Units and the Radeon HD 4850 Sapphire Vapor-X Edition has 800. However, the actual shader performance of the GT 640 is 402 and the actual shader performance of the HD 4850 is 364. The GT 640 having 38 better shader performance is not particularly notable, as altogether the HD 4850 performs better when taking into account other relevant data.

The GT 640 transistor size technology is 27 nm (nanometers) smaller than the HD 4850. This means that the GT 640 is expected to run slightly cooler and achieve higher clock frequencies than the HD 4850.

The GeForce GT 640 v3 Zotac 2GB Edition requires 49 Watts to run but there is no entry for the Radeon HD 4850 Sapphire Vapor-X Edition. We would recommend a PSU with at least 350 Watts for the GT 640 and a PSU with at least 450 Watts for the HD 4850. The HD 4850 has been recommended a PSU with 100 Watts more than the GT 640. The difference is significant enough that the HD 4850 may have an adverse affect on your yearly electricity bills in comparison to the GT 640.

Game FPS Benchmarks On Ultra

GPU Architecture

Core Speed1046 MHzvs650 MHz
Boost Clock-vs-
ArchitectureKepler GK208-400-A1R700 RV770 PRO
OC Potential Poor vs Fair
Driver Support Good vs Poor
Release Date29 May 2013vs01 Oct 2011
GPU LinkGD LinkGD Link
Approved
Comparison

Resolution Performance

1366x768 - green tick vs green tick -
1600x900
5.2
vs green tick
5.8
1920x1080
3.9
vs green tick
4.3
2560x1440
2.6
green tick vs
2.5
3840x2160
1.8
green tick vs
1.7

GPU Memory

Memory2048 MBvs1024 MB
Memory Speed1252 MHzvs1000 MHz
Memory Bus64 Bitvs256 Bit
Memory TypeGDDR5vsGDDR3
Memory Bandwidth40.1GB/secvs64GB/sec
L2 Cache 128 KB green tick vs 0 KB
Delta Color Compression no vs no
Memory Performance 0% green tick vs green tick 0%
Comparison

GPU Display

Shader Processing Units384vs800
Actual Shader Performance19%vs18%
Technology28nmvs55nm
Texture Mapping Units16vs40
Texture Rate16.7 GTexel/svs26 GTexel/s
Render Output Units8vs16
Pixel Rate8.4 GPixel/svs10.4 GPixel/s
Comparison

GPU Outputs

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

GPU Power Requirements

Max Power49 Watts-
Recommended PSU350 Watts & 26 Ampsvs450 Watts

GPU Features

DirectX12.0vs10.1
Shader Model5.0vs4.1
Open GL4.5vs3.3
Open CL-vs-
Notebook GPUnono
SLI/Crossfirenovsyes
Dedicatedyesvsyes
Comparison

GPU Supporting Hardware

Recommended ProcessorIntel Core i3-3220 3.3GHzvsIntel Core 2 Duo E8600 3.33GHz
Recommended RAM8 GBvs6 GB
Maximum Recommended Gaming Resolution1366x768vs1440x900

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 HD 4850 Sapphire Vapor-X Edition is a special edition of the high-end Radeon HD 4850.
The new features includes an increase in the central unit that went from 625MHz to 650MHz and in the operating MC, increased to 1000MHz. A new cooling system is also available.
The performance boost is small and benchmarks indicate it's around 2% when compared to the reference Radeon HD 4850.
Recommended CPU
Possible GPU Upgrades
GPU Variants
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