GPUBoss Review Our evaluation of 645 vs 640


Real world tests using the latest 3D games

crysis: warhead (2013), Crysis: Warhead (2012), Batman: Arkham City and 6 more


Synthetic tests to measure overall performance


Compute Performance

General computing tests executed on the GPU

PassMark Direct Compute

Noise and Power

How loud and hot does the card run idle and under load


GPUBoss Score

Gaming, Benchmarks, Compute Performance and Noise and Power

Nvidia GeForce GTX 645 

GPUBoss recommends the Nvidia GeForce GTX 645  based on its benchmarks and compute performance.

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Differences What are the advantages of each

Front view of GeForce GTX 645

Reasons to consider the
Nvidia GeForce GTX 645

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Significantly higher effective memory clock speed 4,000 MHz vs 1,800 MHz Around 2.2x higher effective memory clock speed
Higher memory bandwidth 64 GB/s vs 28.8 GB/s Around 2.2x higher memory bandwidth
Slightly higher memory clock speed 1,000 MHz vs 900 MHz More than 10% higher memory clock speed
More SMX units 3 vs 2 1 more SMX units
Front view of GeForce GT 640

Reasons to consider the
Leadtek GeForce GT 640

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Higher clock speed 902 MHz vs 824 MHz Around 10% higher clock speed

Benchmarks Real world tests of GeForce GTX 645 vs GT 640

PassMark Industry standard benchmark for overall graphics card performanceData courtesy Passmark

CompuBench 1.5 (Bitcoin mining)

GeForce GTX 645
47.2 mHash/s
GeForce GT 640
22.04 mHash/s

CompuBench 1.5 (Face detection)

GeForce GTX 645
13.8 mPixels/s
GeForce GT 640
10.39 mPixels/s

CompuBench 1.5 (Ocean surface simulation)

GeForce GTX 645
585.48 frames/s
GeForce GT 640
204.44 frames/s

CompuBench 1.5 (Particle simulation)

GeForce GTX 645
218.96 mInteraction/s
GeForce GT 640
97.49 mInteraction/s

PassMark Direct Compute Measures performance of general-purpose computing using Microsoft DirectCompute


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