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Differences What are the advantages of each

Front view of Radeon HD 4890

Reasons to consider the
XFX Radeon HD 4890

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Higher clock speed 1,000 MHz vs 700 MHz Around 45% higher clock speed
Higher effective memory clock speed 4,000 MHz vs 3,600 MHz More than 10% higher effective memory clock speed
Higher memory clock speed 1,000 MHz vs 900 MHz More than 10% higher memory clock speed
Significantly lower TDP 190W vs 286W Around 35% 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
Significantly higher memory bandwidth 230.4 GB/s vs 128 GB/s 80% higher memory bandwidth
More memory 2,048 MB vs 1,024 MB 2x more memory
More shading units 1,600 vs 800 Twice as many shading units
Better floating-point performance 2,240 GFLOPS vs 1,600 GFLOPS 40% better floating-point performance
Much wider memory bus 512 bit vs 256 bit 2x wider memory bus
Better cloud gate factor score 18.34 vs 14.68 Around 25% better cloud gate factor score
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

Benchmarks Real world tests of Radeon HD 4890 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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