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Differences What are the advantages of each

Front view of Radeon R9 280X

Reasons to consider the
Generic Radeon R9 280X

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Much higher memory bandwidth 288 GB/s vs 38.4 GB/s 7.5x higher memory bandwidth
Much better 3DMark06 score 28,452 vs 13,300 Around 2.2x better 3DMark06 score
Much higher effective memory clock speed 6,000 MHz vs 1,600 MHz 3.8x higher effective memory clock speed
Significantly better 3DMark 11 graphics score 10,792 vs 2,310 Around 4.8x better 3DMark 11 graphics score
Much better floating-point performance 4,096 GFLOPS vs 414.7 GFLOPS Around 10x better floating-point performance
Significantly higher texture rate 128 GTexel/s vs 17.28 GTexel/s Around 7.5x higher texture rate
Many more shading units 2,048 vs 144 1904 more shading units
Higher clock speed 850 MHz vs 720 MHz Around 20% higher clock speed
More memory 3,072 MB vs 1,536 MB 2x more memory
Many more texture mapping units 128 vs 24 104 more texture mapping units
Higher pixel rate 32 GPixel/s vs 4.32 GPixel/s Around 7.5x higher pixel rate
Much higher memory clock speed 1,500 MHz vs 800 MHz Around 90% higher memory clock speed
Significantly wider memory bus 384 bit vs 192 bit 2x wider memory bus
More render output processors 32 vs 24 8 more render output processors
Front view of GeForce GT 640 Rebrand

Reasons to consider the
Nvidia GeForce GT 640 Rebrand

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Much lower TDP 75W vs 250W 3.3x lower TDP

Benchmarks Real world tests of Radeon R9 280X vs GeForce GT 640 Rebrand

3DMark 11 Graphics Industry standard benchmark that tests DirectX 11 GPU performance

3DMark Vantage Graphics Industry standard benchmark that tests DirectX 10 GPU performance

3DMark06 Industry standard benchmark that tests DirectX 9 GPU performance

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