GPUBoss Review Our evaluation of 620M 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

6.4

Overall Score

Winner
Nvidia GeForce 840M 

GPUBoss recommends the Nvidia GeForce 840M  based on its benchmarks and compute performance.

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VS
Front view of GeForce 840M

Nvidia GeForce 840M

GPUBoss Winner

Differences What are the advantages of each

Front view of GeForce GT 620M

Reasons to consider the
Nvidia GeForce GT 620M

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Wider memory bus 128 bit vs 64 bit 2x wider memory bus
Higher diablo III framerate 21.12 fps vs 17.7 fps Around 20% higher diablo III framerate
Lower TDP 15W vs 33W 2.2x lower TDP
Front view of GeForce 840M

Reasons to consider the
Nvidia GeForce 840M

Report a correction
Much better T-Rex score 3,359.62 vs 1,668.19 More than 2x better T-Rex score
Significantly higher clock speed 1,029 MHz vs 660 MHz More than 55% higher clock speed
Better PassMark score 879 vs 559 More than 55% better PassMark score
Better 3DMark06 score 2,338 vs 933.5 More than 2.5x better 3DMark06 score
Better 3DMark 11 graphics score 10,332 vs 7,462 Around 40% better 3DMark 11 graphics score
Better 3DMark vantage graphics score 6,627 vs 3,675.5 More than 80% better 3DMark vantage graphics score
Better particle simulation score 184.99 mInteraction/s vs 33.89 mInteraction/s Around 5.5x better particle simulation score
Better floating-point performance 790.3 GFLOPS vs 253.44 GFLOPS More than 3x better floating-point performance
More shading units 384 vs 96 288 more shading units
Better PassMark direct compute score 726 vs 370 More than 95% better PassMark direct compute score
Higher memory clock speed 1,001 MHz vs 900 MHz More than 10% higher memory clock speed

Benchmarks Real world tests of GeForce GT 620M vs 840M

Bitcoin mining Data courtesy CompuBench

GeForce GT 620M
16.61 mHash/s
GeForce 840M
94.68 mHash/s

Face detection Data courtesy CompuBench

GeForce GT 620M
4.23 mPixels/s
GeForce 840M
22.54 mPixels/s

Ocean surface simulation Data courtesy CompuBench

GeForce GT 620M
161.14 frames/s
GeForce 840M
159.36 frames/s

Particle simulation Data courtesy CompuBench

GeForce GT 620M
33.89 mInteraction/s
GeForce 840M
184.99 mInteraction/s

T-Rex (Compubench 1.5) Data courtesy CompuBench

GeForce GT 620M
0.52 frames/s
GeForce 840M
1.23 frames/s

Video composition Data courtesy CompuBench

GeForce GT 620M
7.15 frames/s
GeForce 840M
21.01 frames/s

T-Rex (GFXBench 3.0) Data courtesy CompuBench

GeForce GT 620M
1,668.19
GeForce 840M
3,359.62

Manhattan (GFXBench 3.0) Data courtesy CompuBench

GeForce GT 620M
1,834.7
GeForce 840M
1,855.62

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