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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 28.8 GB/s More than 2x higher memory bandwidth
More texture mapping units 64 vs 16 48 more texture mapping units
Higher texture rate 37.44 GTexel/s vs 10.75 GTexel/s Around 3.5x higher texture rate
Significantly wider memory bus 256 bit vs 128 bit 2x wider memory bus
More render output processors 16 vs 4 12 more render output processors
Slightly higher pixel rate 9.36 GPixel/s vs 2.69 GPixel/s Around 3.5x higher pixel rate
Front view of GeForce GT 540M

Reasons to consider the
Nvidia GeForce GT 540M

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Higher clock speed 672 MHz vs 585 MHz Around 15% higher clock speed
Lower TDP 35W vs 75W 2.1x lower TDP

Benchmarks Real world tests of GeForce GTX 280M vs GT 540M

PassMark Industry standard benchmark for overall graphics card performanceData courtesy Passmark

Features Key features of the GeForce GTX 280M  vs GT 540M 

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

GeForce GTX 280M
60.8 GB/s
GeForce GT 540M
28.8 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 GT 540M
2.69 GPixel/s

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

GeForce GTX 280M
37.44 GTexel/s
GeForce GT 540M
10.75 GTexel/s

floating point performance How fast the gpu can crunch numbers

GeForce GTX 280M
374.5 GFLOPS
GeForce GT 540M
258.05 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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