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Differences What are the advantages of each

Front view of Radeon HD 5770

Reasons to consider the
ATi Radeon HD 5770

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Much higher effective memory clock speed 4,800 MHz vs 1,990 MHz Around 2.5x higher effective memory clock speed
Higher clock speed 850 MHz vs 625 MHz More than 35% higher clock speed
Slightly better PassMark score 1,697 vs 1,129 More than 50% better PassMark score
Higher memory clock speed 1,200 MHz vs 995 MHz More than 20% higher memory clock speed
Much lower TDP 108W vs 250W 2.3x lower TDP
Front view of Radeon HD 4850 X2

Reasons to consider the
ATi Radeon HD 4850 X2

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Is dual GPU Yes vs No About half of graphics cards are dual GPU
Higher memory bandwidth 127.36 GB/s vs 76.8 GB/s More than 65% higher memory bandwidth
Much wider memory bus 512 bit vs 128 bit 4x wider memory bus
More shading units 1,600 vs 800 Twice as many shading units
Better floating-point performance 2,000 GFLOPS vs 1,360 GFLOPS More than 45% better floating-point performance
More render output processors 32 vs 16 Twice as many render output processors
More texture mapping units 80 vs 40 Twice as many texture mapping units
More compute units 20 vs 10 Twice as many compute units
Slightly higher texture rate 50 GTexel/s vs 34 GTexel/s More than 45% higher texture rate
Slightly better cloud gate factor score 15.53 vs 14.6 More than 5% better cloud gate factor score

Benchmarks Real world tests of Radeon HD 5770 vs 4850 X2

PassMark Industry standard benchmark for overall graphics card performanceData courtesy Passmark

Cloud Gate Factor Data courtesy FutureMark

Reviews Word on the street

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