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Differences What are the advantages of each

Front view of Mobility Radeon HD 3470

Reasons to consider the
ATi Mobility Radeon HD 3470

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Slightly higher clock speed 680 MHz vs 625 MHz Around 10% higher clock speed
Front view of GeForce GT 640M

Reasons to consider the
Nvidia GeForce GT 640M

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Better PassMark score 932 vs 93 More than 10x better PassMark score
More memory 2,048 MB vs 256 MB 8x more memory
More render output processors 16 vs 4 12 more render output processors
Higher texture rate 20 GTexel/s vs 2.72 GTexel/s More than 7.2x higher texture rate
More texture mapping units 32 vs 4 28 more texture mapping units
More shading units 384 vs 40 344 more shading units
Wider memory bus 128 bit vs 64 bit 2x wider memory bus
Higher memory clock speed 900 MHz vs 800 MHz Around 15% higher memory clock speed

Benchmarks Real world tests of Mobility Radeon HD 3470 vs GeForce GT 640M

PassMark Industry standard benchmark for overall graphics card performanceData courtesy Passmark

Features Key features of the Mobility Radeon HD 3470  vs GeForce GT 640M 

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

Mobility Radeon HD 3470
2.72 GPixel/s
GeForce GT 640M
5 GPixel/s

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

Mobility Radeon HD 3470
2.72 GTexel/s
GeForce GT 640M
20 GTexel/s

floating point performance How fast the gpu can crunch numbers

GeForce GT 640M

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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