GPUBoss Review Our evaluation of 640M vs 820M among Laptop GPUs under 35W TDP

Gaming

Battlefield 3, Battlefield 4, Bioshock Infinite and 21 more

Graphics

T-Rex, Manhattan and Cloud Gate Factor

Computing

Face Detection, Ocean Surface Simulation and 3 more

Performance per Watt

Battlefield 3, Battlefield 4, Bioshock Infinite and 30 more

Value

Battlefield 3, Battlefield 4, Bioshock Infinite and 30 more

Noise and Power

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

5.9

Overall Score

Winner
Nvidia GeForce GT 640M 

GPUBoss recommends the Nvidia GeForce GT 640M  based on its gaming and benchmarks.

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VS

Differences What are the advantages of each

Front view of GeForce GT 640M

Reasons to consider the
Nvidia GeForce GT 640M

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Much higher dead space 3 framerate 32.6 fps vs 21.7 fps More than 50% higher dead space 3 framerate
Better PassMark score 932 vs 600 More than 55% better PassMark score
Better 3DMark 11 graphics score 10,625.5 vs 7,518 More than 40% better 3DMark 11 graphics score
Much higher hitman: absolution framerate 7.45 vs 4.9 More than 50% higher hitman: absolution framerate
More memory 2,048 MB vs 1,024 MB 2x more memory
Better 3DMark vantage graphics score 6,348 vs 4,254 Around 50% better 3DMark vantage graphics score
Higher diablo III framerate 42.7 fps vs 33.9 fps More than 25% higher diablo III framerate
More render output processors 16 vs 8 Twice as many render output processors
Wider memory bus 128 bit vs 64 bit 2x wider memory bus
More shading units 384 vs 96 288 more shading units
More texture mapping units 32 vs 16 Twice as many texture mapping units
Higher BioShock infinite framerate 14.3 fps vs 8.1 fps More than 75% higher BioShock infinite framerate
Front view of GeForce 820M

Reasons to consider the
Nvidia GeForce 820M

Report a correction
Much better T-Rex score 3,352.98 vs 3,339.75 Almost the same
Slightly lower TDP 15W vs 32W 2.1x lower TDP

Benchmarks Real world tests of GeForce GT 640M vs 820M

Bitcoin mining Data courtesy CompuBench

GeForce GT 640M
17.38 mHash/s
GeForce 820M
23.26 mHash/s

Face detection Data courtesy CompuBench

GeForce GT 640M
7.86 mPixels/s
GeForce 820M
7.69 mPixels/s

T-Rex (GFXBench 3.0) Data courtesy CompuBench

GeForce GT 640M
3,339.75
GeForce 820M
3,352.98

Manhattan (GFXBench 3.0) Data courtesy CompuBench

GeForce GT 640M
3,590.88
GeForce 820M
3,533.46

Fire Strike Factor Data courtesy FutureMark

Sky Diver Factor Data courtesy FutureMark

Bioshock Infinite

Hitman: Absolution

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