GPUBoss Review Our evaluation of 640M vs 840M 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

6.2

Overall Score

Winner
Nvidia GeForce GT 640M 

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

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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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More memory 2,048 MB vs 1,024 MB 2x more memory
Much higher diablo III framerate 42.7 fps vs 17.7 fps Around 2.5x higher diablo III framerate
Higher hitman: absolution framerate 7.45 vs 6.7 More than 10% higher hitman: absolution 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 texture mapping units 32 vs 16 Twice as many texture mapping units
Front view of GeForce 840M

Reasons to consider the
Nvidia GeForce 840M

Report a correction
Significantly higher clock speed 1,029 MHz vs 625 MHz Around 65% higher clock speed
Much better T-Rex score 3,359.62 vs 3,339.75 Almost the same
Better particle simulation score 184.99 mInteraction/s vs 97.1 mInteraction/s More than 90% better particle simulation score
Higher memory clock speed 1,001 MHz vs 900 MHz More than 10% higher memory clock speed
Slightly better PassMark direct compute score 726 vs 528 Around 40% better PassMark direct compute score

Benchmarks Real world tests of GeForce GT 640M vs 840M

Bitcoin mining Data courtesy CompuBench

GeForce GT 640M
17.38 mHash/s
GeForce 840M
94.68 mHash/s

Face detection Data courtesy CompuBench

GeForce GT 640M
7.86 mPixels/s
GeForce 840M
22.54 mPixels/s

T-Rex (GFXBench 3.0) Data courtesy CompuBench

GeForce GT 640M
3,339.75
GeForce 840M
3,359.62

Manhattan (GFXBench 3.0) Data courtesy CompuBench

GeForce GT 640M
3,590.88
GeForce 840M
3,715.08

Fire Strike Factor Data courtesy FutureMark

Sky Diver Factor Data courtesy FutureMark

Thief

Battlefield 4

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Comments

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WTF? 640m vs 840m. 640m won!!!!!!! WTF?
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