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Differences What are the advantages of each

Front view of Radeon R9 270X

Reasons to consider the
AMD Radeon R9 270X

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Much higher effective memory clock speed 5,600 MHz vs 1,600 MHz 3.5x higher effective memory clock speed
Much better 3DMark06 score 23,610 vs 13,300 Around 80% better 3DMark06 score
Much better 3DMark vantage graphics score 28,000 vs 9,030 More than 3x better 3DMark vantage graphics score
Much higher memory bandwidth 179.2 GB/s vs 38.4 GB/s Around 4.8x higher memory bandwidth
Higher clock speed 1,000 MHz vs 720 MHz Around 40% higher clock speed
Better 3DMark 11 graphics score 8,520 vs 2,310 Around 3.8x better 3DMark 11 graphics score
Significantly better floating-point performance 2,688 GFLOPS vs 414.7 GFLOPS Around 6.5x better floating-point performance
Higher texture rate 84 GTexel/s vs 17.28 GTexel/s More than 4.8x higher texture rate
Higher pixel rate 33.6 GPixel/s vs 4.32 GPixel/s More than 7.8x higher pixel rate
Significantly more shading units 1,280 vs 144 1136 more shading units
Significantly more texture mapping units 80 vs 24 56 more texture mapping units
Much higher memory clock speed 1,400 MHz vs 800 MHz 75% higher memory clock speed
More render output processors 32 vs 24 8 more render output processors
Wider memory bus 256 bit vs 192 bit Around 35% wider memory bus
Front view of GeForce GT 640 Rebrand

Reasons to consider the
Nvidia GeForce GT 640 Rebrand

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Significantly lower TDP 75W vs 180W 2.4x lower TDP

Benchmarks Real world tests of Radeon R9 270X 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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