GPUBoss Review Our evaluation of 640 vs 620 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

5.7

Overall Score

Winner
Leadtek GeForce GT 640 

GPUBoss recommends the Leadtek GeForce GT 640  based on its benchmarks and compute performance.

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VS

Differences What are the advantages of each

Front view of GeForce GT 640

Reasons to consider the
Leadtek GeForce GT 640

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Better PassMark score 1,282 vs 432 Around 3x better PassMark score
Higher clock speed 902 MHz vs 810 MHz More than 10% higher clock speed
Significantly better sky diver factor score 143.75 vs 50.4 More than 2.8x better sky diver factor score
Slightly better floating-point performance 692.7 GFLOPS vs 155.52 GFLOPS Around 4.5x better floating-point performance
Slightly higher memory bandwidth 28.8 GB/s vs 14.37 GB/s More than 2x higher memory bandwidth
Higher texture rate 28.86 GTexel/s vs 6.48 GTexel/s Around 4.5x higher texture rate
More render output processors 16 vs 4 12 more render output processors
More texture mapping units 32 vs 8 24 more texture mapping units
More shading units 384 vs 48 336 more shading units
Wider memory bus 128 bit vs 64 bit 2x wider memory bus
Better T-Rex score 0.79 frames/s vs 0 frames/s Compared to all graphics cards, 0.79 frames/s T-Rex score is just OK
Slightly better PassMark direct compute score 684 vs 271 More than 2.5x better PassMark direct compute score
Front view of GeForce GT 620

Reasons to consider the
Nvidia GeForce GT 620

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Lower TDP 30W vs 65W 2.2x lower TDP

Benchmarks Real world tests of GeForce GT 640 vs 620

Bitcoin mining Data courtesy CompuBench

GeForce GT 640
20.86 mHash/s
GeForce GT 620
17.41 mHash/s

Face detection Data courtesy CompuBench

GeForce GT 640
11.31 mPixels/s
GeForce GT 620
2.76 mPixels/s

Ocean surface simulation Data courtesy CompuBench

GeForce GT 640
209.1 frames/s
GeForce GT 620
83.91 frames/s

Particle simulation Data courtesy CompuBench

GeForce GT 640
134.81 mInteraction/s
GeForce GT 620
31.95 mInteraction/s

T-Rex (Compubench 1.5) Data courtesy CompuBench

GeForce GT 640
0.79 frames/s
GeForce GT 620
0 frames/s

Fire Strike Factor Data courtesy FutureMark

Sky Diver Factor Data courtesy FutureMark

Cloud Gate Factor Data courtesy FutureMark

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