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Differences What are the advantages of each

Front view of Mobility Radeon HD 3870

Reasons to consider the
ATi Mobility Radeon HD 3870

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Higher memory bandwidth 54.4 GB/s vs 16.02 GB/s Around 3.5x higher memory bandwidth
Much wider memory bus 256 bit vs 64 bit 4x wider memory bus
More render output processors 16 vs 8 Twice as many render output processors
Front view of GeForce 840M

Reasons to consider the
Nvidia GeForce 840M

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Significantly higher clock speed 1,029 MHz vs 660 MHz More than 55% higher clock speed
Higher memory clock speed 1,001 MHz vs 850 MHz Around 20% higher memory clock speed
Lower TDP 33W vs 55W 40% lower TDP

Benchmarks Real world tests of Mobility Radeon HD 3870 vs GeForce 840M

PassMark Industry standard benchmark for overall graphics card performanceData courtesy Passmark

Features Key features of the Mobility Radeon HD 3870  vs GeForce 840M 

memory bandwidth Rate at which data can be read from or stored in onboard memory

GeForce 840M
16.02 GB/s

pixel rate Number of pixels a graphics card can render to the screen every second

Mobility Radeon HD 3870
10.56 GPixel/s
GeForce 840M
8.23 GPixel/s

texture rate Speed at which a graphics card can perform texture mapping

Mobility Radeon HD 3870
10.56 GTexel/s
GeForce 840M
16.46 GTexel/s

floating point performance How fast the gpu can crunch numbers

GeForce 840M
790.3 GFLOPS

shading units Subcomponents of the gpu, these run in parallel to enable fast pixel shading

texture mapping units Built into each gpu, these resize and rotate bitmaps for texturing scenes

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