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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 24 40 more texture mapping units
More render output processors 16 vs 8 Twice as many render output processors
Front view of GeForce 940M

Reasons to consider the
Nvidia GeForce 940M

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Much higher clock speed 1,072 MHz vs 585 MHz Around 85% higher clock speed
Better PassMark score 952 vs 667 Around 45% better PassMark score
More memory 2,048 MB vs 1,024 MB 2x more memory
Slightly better floating-point performance 823.3 GFLOPS vs 374.5 GFLOPS Around 2.2x better floating-point performance
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 940M

PassMark Industry standard benchmark for overall graphics card performanceData courtesy Passmark

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

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

GeForce GTX 280M
60.8 GB/s
GeForce 940M
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 940M
8.58 GPixel/s

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

GeForce GTX 280M
37.44 GTexel/s
GeForce 940M
25.73 GTexel/s

floating point performance How fast the gpu can crunch numbers

GeForce GTX 280M
374.5 GFLOPS
GeForce 940M
823.3 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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