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Differences What are the advantages of each

Front view of Radeon HD 6850

Reasons to consider the
AMD Radeon HD 6850

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Significantly higher effective memory clock speed 4,000 MHz vs 1,802 MHz Around 2.2x higher effective memory clock speed
Significantly better cloud gate factor score 16.97 vs 10.96 Around 55% better cloud gate factor score
More shading units 960 vs 640 320 more shading units
More texture mapping units 48 vs 32 16 more texture mapping units
Slightly more compute units 12 vs 8 4 more compute units
Higher memory clock speed 1,000 MHz vs 901 MHz More than 10% higher memory clock speed
Lower TDP 127W vs 165W Around 25% lower TDP
Front view of Radeon HD 3870 X2

Reasons to consider the
ATi Radeon HD 3870 X2

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Is dual GPU Yes vs No About half of graphics cards are dual GPU
Much wider memory bus 512 bit vs 256 bit 2x wider memory bus

Benchmarks Real world tests of Radeon HD 6850 vs 3870 X2

T-Rex (GFXBench 3.0) Data courtesy CompuBench

Radeon HD 6850
3,353.74

Cloud Gate Factor Data courtesy FutureMark

Reviews Word on the street

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