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Differences What are the advantages of each

Front view of Mobility Radeon HD 3870 X2

Reasons to consider the
ATi Mobility Radeon HD 3870 X2

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Is dual GPU Yes vs No About half of graphics cards are dual GPU
Significantly higher memory bandwidth 108.8 GB/s vs 14.4 GB/s More than 7.5x higher memory bandwidth
Much wider memory bus 512 bit vs 64 bit 8x wider memory bus
Significantly more render output processors 32 vs 8 24 more render output processors
Higher pixel rate 21.12 GPixel/s vs 8.58 GPixel/s Around 2.5x higher pixel rate
More shading units 640 vs 384 256 more shading units
Front view of GeForce 940M

Reasons to consider the
Nvidia GeForce 940M

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Significantly higher clock speed 1,072 MHz vs 660 MHz More than 60% higher clock speed
Better PassMark score 952 vs 563 Around 70% better PassMark score
More memory 2,048 MB vs 1,024 MB 2x more memory
Significantly lower TDP 33W vs 110W 3.3x lower TDP

Benchmarks Real world tests of Mobility Radeon HD 3870 X2 vs GeForce 940M

PassMark Industry standard benchmark for overall graphics card performanceData courtesy Passmark

Features Key features of the Mobility Radeon HD 3870 X2  vs GeForce 940M 

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

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

GeForce 940M
8.58 GPixel/s

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

GeForce 940M
25.73 GTexel/s

floating point performance How fast the gpu can crunch numbers

GeForce 940M
823.3 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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