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Differences What are the advantages of each

Front view of Radeon HD 7770

Reasons to consider the
AMD Radeon HD 7770

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Significantly higher clock speed 1,000 MHz vs 625 MHz 60% higher clock speed
Much higher effective memory clock speed 4,500 MHz vs 1,990 MHz More than 2.2x higher effective memory clock speed
Better PassMark score 2,194 vs 1,129 Around 95% better PassMark score
Much lower TDP 80W vs 250W 3.1x lower TDP
Higher memory clock speed 1,125 MHz vs 995 MHz Around 15% higher memory clock speed
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 72 GB/s More than 75% higher memory bandwidth
Much wider memory bus 512 bit vs 128 bit 4x wider memory bus
Significantly more shading units 1,600 vs 640 960 more shading units
Better floating-point performance 2,000 GFLOPS vs 1,280 GFLOPS More than 55% 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

Benchmarks Real world tests of Radeon HD 7770 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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