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Differences What are the advantages of each

Front view of Mobility Radeon HD 4870

Reasons to consider the
ATi Mobility Radeon HD 4870

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Better PassMark score 702 vs 331 More than 2x better PassMark score
Higher memory bandwidth 89.6 GB/s vs 25.6 GB/s Around 3.5x higher memory bandwidth
Higher effective memory clock speed 2,800 MHz vs 1,600 MHz 75% higher effective memory clock speed
Better floating-point performance 880 GFLOPS vs 99.2 GFLOPS More than 8.8x better floating-point performance
More shading units 800 vs 32 768 more shading units
Significantly wider memory bus 256 bit vs 128 bit 2x wider memory bus
More texture mapping units 40 vs 16 24 more texture mapping units
More render output processors 16 vs 8 Twice as many render output processors
Front view of GeForce 9700M GT

Reasons to consider the
Nvidia GeForce 9700M GT

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Higher clock speed 625 MHz vs 550 MHz Around 15% higher clock speed
Higher memory clock speed 800 MHz vs 700 MHz Around 15% higher memory clock speed

Benchmarks Real world tests of Mobility Radeon HD 4870 vs GeForce 9700M GT

PassMark Industry standard benchmark for overall graphics card performanceData courtesy Passmark

Features Key features of the Mobility Radeon HD 4870  vs GeForce 9700M GT 

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

GeForce 9700M GT
5 GPixel/s

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

GeForce 9700M GT
10 GTexel/s

floating point performance How fast the gpu can crunch numbers

GeForce 9700M GT
99.2 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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