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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 16.02 GB/s Around 3.2x higher memory bandwidth
Much wider memory bus 256 bit vs 64 bit 4x wider memory bus
More texture mapping units 56 vs 24 32 more texture mapping units
More render output processors 16 vs 8 Twice as many render output processors
Front view of GeForce 940MX

Reasons to consider the
Nvidia GeForce 940MX

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Much higher clock speed 1,122 MHz vs 500 MHz Around 2.2x higher clock speed
Better PassMark score 1,225 vs 769 Around 60% better PassMark score
More memory 2,048 MB vs 1,024 MB 2x more memory
Better floating-point performance 861.7 GFLOPS vs 280 GFLOPS More than 3x better floating-point performance
More shading units 384 vs 112 272 more shading units
Higher memory clock speed 1,001 MHz vs 800 MHz More than 25% higher memory clock speed
Lower TDP 23W vs 75W 3.3x lower TDP

Benchmarks Real world tests of GeForce 9800M GTX vs 940MX

PassMark Industry standard benchmark for overall graphics card performanceData courtesy Passmark

Features Key features of the GeForce 9800M GTX  vs 940MX 

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

GeForce 9800M GTX
51.2 GB/s
GeForce 940MX
16.02 GB/s

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

GeForce 9800M GTX
8 GPixel/s
GeForce 940MX
8.98 GPixel/s

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

GeForce 9800M GTX
28 GTexel/s
GeForce 940MX
26.93 GTexel/s

floating point performance How fast the gpu can crunch numbers

GeForce 9800M GTX
280 GFLOPS
GeForce 940MX
861.7 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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