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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 16.02 GB/s More than 3.8x higher memory bandwidth
Much wider memory bus 256 bit vs 64 bit 4x wider memory bus
More texture mapping units 64 vs 24 40 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 585 MHz More than 90% higher clock speed
Better PassMark score 1,225 vs 667 Around 85% better PassMark score
More memory 2,048 MB vs 1,024 MB 2x more memory
Slightly better floating-point performance 861.7 GFLOPS vs 374.5 GFLOPS More than 2.2x better floating-point performance
More shading units 384 vs 128 Three times as many shading units
Lower TDP 23W vs 75W 3.3x lower TDP

Benchmarks Real world tests of GeForce GTX 280M vs 940MX

PassMark Industry standard benchmark for overall graphics card performanceData courtesy Passmark

Features Key features of the GeForce GTX 280M  vs 940MX 

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

GeForce GTX 280M
60.8 GB/s
GeForce 940MX
16.02 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 940MX
8.98 GPixel/s

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

GeForce GTX 280M
37.44 GTexel/s
GeForce 940MX
26.93 GTexel/s

floating point performance How fast the gpu can crunch numbers

GeForce GTX 280M
374.5 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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