GPUBoss Review Our evaluation of 645 vs 640 among Desktop GPUs

Gaming

Battlefield 3, Battlefield 4, Bioshock Infinite and 21 more

Graphics

T-Rex, Manhattan, Cloud Gate Factor, Sky Diver Factor and 1 more

Computing

Face Detection, Ocean Surface Simulation and 3 more

Performance per Watt

Battlefield 3, Battlefield 4, Bioshock Infinite and 32 more

Value

Battlefield 3, Battlefield 4, Bioshock Infinite and 32 more

Noise and Power

TDP, Idle Power Consumption, Load Power Consumption and 2 more

7

Overall Score

Winner
Nvidia GeForce GTX 645 

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

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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
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
Better cloud gate factor score 12.89 vs 11.64 More than 10% better cloud gate factor score

Benchmarks Real world tests of GeForce GTX 645 vs GT 640

Bitcoin mining Data courtesy CompuBench

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

Face detection Data courtesy CompuBench

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

Ocean surface simulation Data courtesy CompuBench

GeForce GTX 645
584.31 frames/s
GeForce GT 640
292.5 frames/s

Particle simulation Data courtesy CompuBench

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

T-Rex (Compubench 1.5) Data courtesy CompuBench

GeForce GTX 645
1.69 frames/s
GeForce GT 640
0.79 frames/s

Fire Strike Factor Data courtesy FutureMark

Sky Diver Factor Data courtesy FutureMark

Cloud Gate Factor Data courtesy FutureMark

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