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Differences What are the advantages of each

Front view of Radeon HD 6670

Reasons to consider the
AMD Radeon HD 6670

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Higher effective memory clock speed 4,000 MHz vs 1,700 MHz More than 2.2x higher effective memory clock speed
Higher clock speed 800 MHz vs 660 MHz More than 20% higher clock speed
Higher memory clock speed 1,000 MHz vs 850 MHz Around 20% higher memory clock speed
Lower TDP 66W vs 110W 40% lower TDP
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 64 GB/s 70% higher memory bandwidth
More render output processors 32 vs 8 24 more render output processors
Higher pixel rate 21.12 GPixel/s vs 6.4 GPixel/s More than 3.2x higher pixel rate
Wider memory bus 512 bit vs 128 bit 4x wider memory bus

Benchmarks Real world tests of Radeon HD 6670 vs Mobility Radeon HD 3870 X2

PassMark Industry standard benchmark for overall graphics card performanceData courtesy Passmark

Features Key features of the Radeon HD 6670  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 6670
6.4 GPixel/s

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

Radeon HD 6670
19.2 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon HD 6670
768 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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