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Gaming Performance Comparison

Recommended System Requirements
Game GeForce GT 640 v3 Zotac 2GB Edition FireStream 9250
Halo: Reach 100% 102%
Cyberpunk 2077 765% 774%
Red Dead Redemption 2 529% 537%
Dragon Ball Z Kakarot 288% 293%
Call of Duty: Modern Warfare 529% 537%
Doom Eternal 441% 447%
Microsoft Flight Simulator 765% 774%
Grand Theft Auto VI 862% 873%
FIFA 20 235% 239%
Need For Speed Heat 529% 537%

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 FireStream 9250.

The GT 640 has a 421 MHz higher core clock speed than the FireStream 9250, but the FireStream 9250 has 24 more Texture Mapping Units than the GT 640. As a result, the FireStream 9250 exhibits a 8.3 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 421 MHz higher core clock speed than the FireStream 9250, but the FireStream 9250 has 8 more Render Output Units than the GT 640. As a result, the FireStream 9250 exhibits a 1.6 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 three years more recently than the FireStream 9250, and so the GT 640 is likely to have far better driver support, meaning it will be much more optimized and ultimately superior to the FireStream 9250 when running the latest games.

The GT 640 has 1024 MB more video memory than the FireStream 9250, 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 FireStream 9250 has 23.5 GB/sec greater memory bandwidth than the GT 640, which means that the memory performance of the FireStream 9250 is slightly better than the GT 640.

The GeForce GT 640 v3 Zotac 2GB Edition has 384 Shader Processing Units and the FireStream 9250 has 800. However, the actual shader performance of the GT 640 is 402 and the actual shader performance of the FireStream 9250 is 325. The GT 640 having 77 better shader performance is not particularly notable, as altogether the FireStream 9250 performs better when taking into account other relevant data.

The GT 640 transistor size technology is 27 nm (nanometers) smaller than the FireStream 9250. This means that the GT 640 is expected to run slightly cooler and achieve higher clock frequencies than the FireStream 9250. While they exhibit similar graphical performance, the GT 640 should consume less power than the FireStream 9250.

The GeForce GT 640 v3 Zotac 2GB Edition requires 49 Watts to run and the FireStream 9250 requires 150 Watts. We would recommend a PSU with at least 350 Watts for the GT 640 and a PSU with at least 500 Watts for the FireStream 9250. The FireStream 9250 requires 101 Watts more than the GT 640 to run. The difference is significant enough that the FireStream 9250 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 MHzvs625 MHz
Boost Clock-vs-
ArchitectureKepler GK208-400-A1RV770
OC Potential Poor vs Poor
Driver Support Good vs -
Release Date29 May 2013vs16 Jun 2008
GPU LinkGD LinkGD Link

Resolution Performance

1366x768 - green tick vs green tick -
green tick vs -
green tick vs -
green tick vs -
green tick vs -

GPU Memory

Memory2048 MBvs1024 MB
Memory Speed1252 MHzvs993 MHz
Memory Bus64 Bitvs256 Bit
Memory TypeGDDR5vsGDDR3
Memory Bandwidth40.1GB/secvs63.6GB/sec
L2 Cache 128 KB green tick vs -
Delta Color Compression no vs no
Memory Performance 0% green tick vs green tick 0%

GPU Display

Shader Processing Units384vs800
Actual Shader Performance19%vs16%
Texture Mapping Units16vs40
Texture Rate16.7 GTexel/svs25 GTexel/s
Render Output Units8vs16
Pixel Rate8.4 GPixel/svs10 GPixel/s

GPU Outputs

Max Digital Resolution (WxH)4096x2160vs2560x1600
VGA Connections1vs0
DVI Connections1vs1
HDMI Connections1vs0
DisplayPort Connections-vs-

GPU Power Requirements

Max Power49 Wattsvs150 Watts
Recommended PSU350 Watts & 26 Ampsvs500 Watts & 33 Amps

GPU Features

Shader Model5.0vs4.0
Open GL4.5vs3.0
Open CL-vs-
Notebook GPUnono

GPU Supporting Hardware

Recommended ProcessorIntel Core i3-3220 3.3GHz-
Recommended RAM8 GBvs8 GB
Maximum Recommended Gaming Resolution1366x768vs1600x900

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.

Without Overclocking Out of The Box, GeForce GT 640 v3 Zotac 2GB Edition is as fast as the reference GeForce GT 640 v3.
The AMD FireStream product line provides the industry's first double-precision floating point capability on a GPU. The AMD FireStream 9250 is our second generation DP-FP product. With 1GB GDDR3 memory on board and single-precision performance of 1 TFLOPS, it is ideal for the most demanding compute-intensive, data-parallel tasks. Using ground-breaking 55nm process technology, even this large-memory board consumes less than 120 watts peak, making it easy to deploy in a variety of server and workstation packages.
Recommended CPU
Possible GPU Upgrades
GPU Variants