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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
Higher pixel rate 21.12 GPixel/s vs 7.63 GPixel/s More than 2.8x higher pixel rate
More render output processors 32 vs 16 Twice as many render output processors
More shading units 640 vs 384 256 more shading units
Front view of GeForce 920M

Reasons to consider the
Nvidia GeForce 920M

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Significantly higher clock speed 954 MHz vs 660 MHz Around 45% higher clock speed
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 920M

PassMark Industry standard benchmark for overall graphics card performanceData courtesy Passmark

Features Key features of the Mobility Radeon HD 3870 X2  vs GeForce 920M 

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 920M
7.63 GPixel/s

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

GeForce 920M
30.53 GTexel/s

floating point performance How fast the gpu can crunch numbers

GeForce 920M
732.7 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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