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Differences What are the advantages of each

Front view of Mobility Radeon HD 5870

Reasons to consider the
ATi Mobility Radeon HD 5870

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Better PassMark score 1,223 vs 667 Around 85% better PassMark score
Higher effective memory clock speed 4,000 MHz vs 1,900 MHz More than 2x higher effective memory clock speed
Higher clock speed 700 MHz vs 585 MHz Around 20% higher clock speed
Better floating-point performance 1,120 GFLOPS vs 374.5 GFLOPS Around 3x better floating-point performance
More shading units 800 vs 128 672 more shading units
Lower TDP 50W vs 75W Around 35% lower TDP
Front view of GeForce GTX 280M

Reasons to consider the
Nvidia GeForce GTX 280M

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Significantly wider memory bus 256 bit vs 128 bit 2x wider memory bus
More texture mapping units 64 vs 40 24 more texture mapping units

Benchmarks Real world tests of Mobility Radeon HD 5870 vs GeForce GTX 280M

PassMark Industry standard benchmark for overall graphics card performanceData courtesy Passmark

Features Key features of the Mobility Radeon HD 5870  vs GeForce GTX 280M 

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

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

Mobility Radeon HD 5870
11.2 GPixel/s
GeForce GTX 280M
9.36 GPixel/s

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

GeForce GTX 280M
37.44 GTexel/s

floating point performance How fast the gpu can crunch numbers

GeForce GTX 280M
374.5 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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