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Differences What are the advantages of each

Front view of GeForce 9800M GTX

Reasons to consider the
Nvidia GeForce 9800M GTX

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Higher memory bandwidth 51.2 GB/s vs 14.4 GB/s More than 3.5x higher memory bandwidth
Much wider memory bus 256 bit vs 64 bit 4x wider memory bus
More texture mapping units 56 vs 32 24 more texture mapping units
Front view of GeForce 920M

Reasons to consider the
Nvidia GeForce 920M

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Much higher clock speed 954 MHz vs 500 MHz More than 90% higher clock speed
More memory 2,048 MB vs 1,024 MB 2x more memory
Slightly better floating-point performance 732.7 GFLOPS vs 280 GFLOPS More than 2.5x better floating-point performance
More shading units 384 vs 112 272 more shading units
Higher memory clock speed 900 MHz vs 800 MHz Around 15% higher memory clock speed
Lower TDP 33W vs 75W 2.3x lower TDP

Benchmarks Real world tests of GeForce 9800M GTX vs 920M

PassMark Industry standard benchmark for overall graphics card performanceData courtesy Passmark

Features Key features of the GeForce 9800M GTX  vs 920M 

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

GeForce 9800M GTX
51.2 GB/s
GeForce 920M
14.4 GB/s

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

GeForce 9800M GTX
8 GPixel/s
GeForce 920M
7.63 GPixel/s

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

GeForce 9800M GTX
28 GTexel/s
GeForce 920M
30.53 GTexel/s

floating point performance How fast the gpu can crunch numbers

GeForce 9800M GTX
280 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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