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Differences What are the advantages of each

Front view of Radeon HD 8990

Reasons to consider the
AMD Radeon HD 8990

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Is dual GPU Yes vs No About half of graphics cards are dual GPU
Much better floating-point performance 10,752 GFLOPS vs 3,977 GFLOPS Around 2.8x better floating-point performance
Significantly higher clock speed 1,050 MHz vs 863 MHz More than 20% higher clock speed
Much higher memory bandwidth 576 GB/s vs 288.4 GB/s Around 2x higher memory bandwidth
Significantly more memory 6,144 MB vs 3,072 MB 2x more memory
Much higher pixel rate 100.8 GPixel/s vs 41.4 GPixel/s Around 2.5x higher pixel rate
Much higher texture rate 336 GTexel/s vs 166.4 GTexel/s More than 2x higher texture rate
Many more shading units 5,120 vs 2,304 2816 more shading units
Many more render output processors 96 vs 48 Twice as many render output processors
Significantly more texture mapping units 320 vs 192 128 more texture mapping units
Much wider memory bus 768 bit vs 384 bit 2x wider memory bus
Front view of GeForce GTX 780

Reasons to consider the
Nvidia GeForce GTX 780

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Significantly better passmark score 8,053 vs 5,012 More than 60% better passmark score
Better passmark direct compute score 4,006 vs 2,779 Around 45% better passmark direct compute score

Benchmarks Real world tests of Radeon HD 8990 vs GeForce GTX 780

Passmark Industry standard benchmark for overall graphics card performance

Passmark Direct Compute Measures performance of general-purpose computing using Microsoft DirectCompute

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