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Differences What are the advantages of each

Front view of Radeon HD 6990M

Reasons to consider the
AMD Radeon HD 6990M

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Higher clock speed 715 MHz vs 620 MHz More than 15% higher clock speed
Better floating-point performance 1,601.6 GFLOPS vs 952.3 GFLOPS Around 70% better floating-point performance
Higher pixel rate 22.88 GPixel/s vs 9.92 GPixel/s More than 2.2x higher pixel rate
More shading units 1,120 vs 384 736 more shading units
Slightly higher effective memory clock speed 3,600 MHz vs 3,000 MHz 20% higher effective memory clock speed
Slightly higher memory bandwidth 115.2 GB/s vs 96 GB/s More than 20% higher memory bandwidth
Higher memory clock speed 900 MHz vs 750 MHz 20% higher memory clock speed
Front view of GeForce GTX 580M

Reasons to consider the
Nvidia GeForce GTX 580M

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Slightly more texture mapping units 64 vs 56 8 more texture mapping units

Benchmarks Real world tests of Radeon HD 6990M vs GeForce GTX 580M

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