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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 memory bandwidth 115.2 GB/s vs 64 GB/s 80% higher memory bandwidth
Better floating-point performance 1,601.6 GFLOPS vs 641.3 GFLOPS Around 2.5x better floating-point performance
Higher pixel rate 22.88 GPixel/s vs 6.68 GPixel/s Around 3.5x higher pixel rate
More shading units 1,120 vs 384 736 more shading units
More render output processors 32 vs 16 Twice as many render output processors
Significantly wider memory bus 256 bit vs 128 bit 2x wider memory bus
More texture mapping units 56 vs 32 24 more texture mapping units
Front view of GeForce GTX 660M

Reasons to consider the
Nvidia GeForce GTX 660M

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Higher clock speed 835 MHz vs 715 MHz More than 15% higher clock speed
Higher memory clock speed 1,000 MHz vs 900 MHz More than 10% higher memory clock speed
Lower TDP 50W vs 100W 2x lower TDP

Benchmarks Real world tests of Radeon HD 6990M vs GeForce GTX 660M

Battlefield 3

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