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Differences What are the advantages of each

Front view of GeForce GTX 280M

Reasons to consider the
Nvidia GeForce GTX 280M

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Higher memory bandwidth 60.8 GB/s vs 14.4 GB/s Around 4.2x higher memory bandwidth
Much wider memory bus 256 bit vs 64 bit 4x wider memory bus
More texture mapping units 64 vs 32 Twice as many texture mapping units
Front view of GeForce 920M

Reasons to consider the
Nvidia GeForce 920M

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Significantly higher clock speed 954 MHz vs 585 MHz Around 65% higher clock speed
More memory 2,048 MB vs 1,024 MB 2x more memory
More shading units 384 vs 128 Three times as many shading units
Lower TDP 33W vs 75W 2.3x lower TDP

Benchmarks Real world tests of GeForce GTX 280M vs 920M

PassMark Industry standard benchmark for overall graphics card performanceData courtesy Passmark

Features Key features of the GeForce GTX 280M  vs 920M 

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

GeForce GTX 280M
60.8 GB/s
GeForce 920M
14.4 GB/s

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

GeForce GTX 280M
9.36 GPixel/s
GeForce 920M
7.63 GPixel/s

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

GeForce GTX 280M
37.44 GTexel/s
GeForce 920M
30.53 GTexel/s

floating point performance How fast the gpu can crunch numbers

GeForce GTX 280M
374.5 GFLOPS
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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