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Differences What are the advantages of each

Front view of Radeon HD 7850

Reasons to consider the
AMD Radeon HD 7850

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Better PassMark score 3,813 vs 872 More than 4.2x better PassMark score
Significantly higher effective memory clock speed 4,800 MHz vs 1,802 MHz Around 2.8x higher effective memory clock speed
Higher memory bandwidth 153.6 GB/s vs 115.32 GB/s Around 35% higher memory bandwidth
Much better cloud gate factor score 19.02 vs 10.96 Around 75% better cloud gate factor score
More memory 2,048 MB vs 1,024 MB 2x more memory
Better floating-point performance 1,761.3 GFLOPS vs 1,056 GFLOPS More than 65% better floating-point performance
Higher texture rate 55 GTexel/s vs 26.4 GTexel/s More than 2x higher texture rate
More texture mapping units 64 vs 32 Twice as many texture mapping units
More shading units 1,024 vs 640 384 more shading units
Higher memory clock speed 1,200 MHz vs 901 MHz Around 35% higher memory clock speed
More compute units 16 vs 8 Twice as many compute units
Lower TDP 130W vs 165W More than 20% 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
Wider memory bus 512 bit vs 256 bit 2x wider memory bus

Benchmarks Real world tests of Radeon HD 7850 vs 3870 X2

PassMark Industry standard benchmark for overall graphics card performanceData courtesy Passmark

T-Rex (GFXBench 3.0) Data courtesy CompuBench

Radeon HD 7850
3,358.44

Cloud Gate Factor Data courtesy FutureMark

Reviews Word on the street

Radeon HD 7850  vs 3870 X2 

9.1
8.4
We see very good overclocking potential for GPU clock, which is the best of all HD 7850 cards that we've reviewed so far.
Radeon HD 7850

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