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Differences What are the advantages of each

Front view of Radeon HD 8490

Reasons to consider the
AMD Radeon HD 8490

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Higher clock speed 875 MHz vs 700 MHz 25% higher clock speed
Higher memory clock speed 900 MHz vs 750 MHz 20% higher memory clock speed
Significantly lower TDP 35W vs 130W 3.7x lower TDP
Front view of Radeon HD 4860

Reasons to consider the
Sapphire Radeon HD 4860

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Significantly higher memory bandwidth 96 GB/s vs 14.4 GB/s Around 6.8x higher memory bandwidth
Higher effective memory clock speed 3,000 MHz vs 1,800 MHz More than 65% higher effective memory clock speed
Significantly better cloud gate factor score 12.93 vs 6.58 More than 95% better cloud gate factor score
Better floating-point performance 896 GFLOPS vs 280 GFLOPS Around 3.2x better floating-point performance
Significantly wider memory bus 256 bit vs 64 bit 4x wider memory bus
More render output processors 16 vs 4 12 more render output processors
More shading units 640 vs 160 480 more shading units
Slightly higher pixel rate 11.2 GPixel/s vs 3.5 GPixel/s Around 3.2x higher pixel rate
Slightly higher texture rate 22.4 GTexel/s vs 7 GTexel/s Around 3.2x higher texture rate
More texture mapping units 32 vs 8 24 more texture mapping units
More compute units 8 vs 2 6 more compute units

Benchmarks Real world tests of Radeon HD 8490 vs 4860

T-Rex (GFXBench 3.0) Data courtesy CompuBench

Radeon HD 8490
1,776.24
Radeon HD 4860
3,355.58

Cloud Gate Factor Data courtesy FutureMark

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