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 GT 645 

GPUBoss recommends the Nvidia GeForce GT 645  based on its .

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VS

Differences What are the advantages of each

Front view of GeForce GT 645

Reasons to consider the
Nvidia GeForce GT 645

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Significantly higher effective memory clock speed 3,828 MHz vs 1,800 MHz Around 2.2x higher effective memory clock speed
Better passmark score 2,498 vs 1,286 Around 95% better passmark score
Higher memory bandwidth 91.9 GB/s vs 28.8 GB/s Around 3.2x higher memory bandwidth
More render output processors 24 vs 16 8 more render output processors
Wider memory bus 192 bit vs 128 bit 50% wider memory bus
Front view of GeForce GT 640

Reasons to consider the
Leadtek GeForce GT 640

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Higher clock speed 902 MHz vs 776 MHz More than 15% higher clock speed
Lower TDP 65W vs 102W More than 35% lower TDP

Benchmarks Real world tests of GeForce GT 645 vs 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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