GPUBoss Review Our evaluation of 645 vs 640

Gaming

Real world tests using the latest 3D games

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

Benchmarks

Synthetic tests to measure overall performance

Passmark

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

TDP

GPUBoss Score

Gaming, Benchmarks, Compute Performance and Noise and Power

Winner
Nvidia GeForce GTX 645 

GPUBoss recommends the Nvidia GeForce GTX 645  based on its .

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VS

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
Slightly better passmark score 1,912 vs 1,287 Around 50% better passmark score
Higher memory bandwidth 64 GB/s vs 28.8 GB/s Around 2.2x higher memory bandwidth
Higher memory clock speed 1,000 MHz vs 900 MHz More than 10% higher memory clock speed
Front view of GeForce GT 640

Reasons to consider the
Leadtek GeForce GT 640

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Higher clock speed 902 MHz vs 823 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 performance

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

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