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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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Higher clock speed 700 MHz vs 500 MHz 40% higher clock speed
Better floating-point performance 1,120 GFLOPS vs 240 GFLOPS Around 4.8x better floating-point performance
Higher effective memory clock speed 4,000 MHz vs 3,200 MHz 25% higher effective memory clock speed
More shading units 800 vs 96 704 more shading units
Higher pixel rate 11.2 GPixel/s vs 4 GPixel/s More than 2.8x higher pixel rate
More render output processors 16 vs 8 Twice as many render output processors
Higher memory clock speed 1,000 MHz vs 800 MHz 25% higher memory clock speed
Front view of GeForce GTS 250M

Reasons to consider the
Nvidia GeForce GTS 250M

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Lower TDP 28W vs 50W Around 45% lower TDP

Benchmarks Real world tests of Mobility Radeon HD 5870 vs GeForce GTS 250M

T-Rex (GFXBench 3.0) Data courtesy CompuBench

Features Key features of the Mobility Radeon HD 5870  vs GeForce GTS 250M 

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 GTS 250M
4 GPixel/s

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

GeForce GTS 250M
16 GTexel/s

floating point performance How fast the gpu can crunch numbers

GeForce GTS 250M
240 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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