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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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Higher clock speed 1,000 MHz vs 700 MHz Around 45% higher clock speed
Better PassMark score 2,194 vs 1,279 More than 70% better PassMark score
Higher effective memory clock speed 4,500 MHz vs 3,600 MHz 25% higher effective memory clock speed
Higher memory clock speed 1,125 MHz vs 900 MHz 25% higher memory clock speed
Much lower TDP 80W vs 286W 3.6x lower TDP
Front view of Radeon HD 4870 X2

Reasons to consider the
ATi Radeon HD 4870 X2

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Is dual GPU Yes vs No About half of graphics cards are dual GPU
Much higher memory bandwidth 230.4 GB/s vs 72 GB/s Around 3.2x higher memory bandwidth
Better floating-point performance 2,240 GFLOPS vs 1,280 GFLOPS 75% better floating-point performance
Much wider memory bus 512 bit vs 128 bit 4x wider memory bus
More memory 2,048 MB vs 1,024 MB 2x more memory
Significantly more shading units 1,600 vs 640 960 more shading units
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 56 GTexel/s vs 40 GTexel/s 40% higher texture rate
Better cloud gate factor score 18.34 vs 16.18 Around 15% better cloud gate factor score

Benchmarks Real world tests of Radeon HD 7770 vs 4870 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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