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Differences What are the advantages of each

Front view of Radeon HD 4850

Reasons to consider the
ATi Radeon HD 4850

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Higher memory clock speed 993 MHz vs 850 MHz More than 15% higher memory clock speed
Front view of Mobility Radeon HD 3870 X2

Reasons to consider the
ATi Mobility Radeon HD 3870 X2

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Is dual GPU Yes vs No About half of graphics cards are dual GPU
Higher memory bandwidth 108.8 GB/s vs 63.55 GB/s More than 70% higher memory bandwidth
More render output processors 32 vs 16 Twice as many render output processors
Higher pixel rate 21.12 GPixel/s vs 10 GPixel/s More than 2x higher pixel rate
Wider memory bus 512 bit vs 256 bit 2x wider memory bus

Benchmarks Real world tests of Radeon HD 4850 vs Mobility Radeon HD 3870 X2

PassMark Industry standard benchmark for overall graphics card performanceData courtesy Passmark

Features Key features of the Radeon HD 4850  vs Mobility Radeon HD 3870 X2 

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

Radeon HD 4850
10 GPixel/s

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

Radeon HD 4850
25 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon HD 4850
1,000 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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