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Differences What are the advantages of each

Front view of Radeon HD 5770

Reasons to consider the
ATi Radeon HD 5770

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Much higher effective memory clock speed 4,800 MHz vs 1,600 MHz 3x higher effective memory clock speed
Better 3DMark06 score 17,844 vs 13,300 Around 35% better 3DMark06 score
Higher clock speed 850 MHz vs 720 MHz Around 20% higher clock speed
Higher memory bandwidth 76.8 GB/s vs 38.4 GB/s 2x higher memory bandwidth
Better floating-point performance 1,360 GFLOPS vs 414.7 GFLOPS More than 3.2x better floating-point performance
More shading units 800 vs 144 656 more shading units
Significantly higher memory clock speed 1,200 MHz vs 800 MHz 50% higher memory clock speed
Higher pixel rate 13.6 GPixel/s vs 4.32 GPixel/s Around 3.2x higher pixel rate
Slightly higher texture rate 34 GTexel/s vs 17.28 GTexel/s More than 95% higher texture rate
More texture mapping units 40 vs 24 16 more texture mapping units
Front view of GeForce GT 640 Rebrand

Reasons to consider the
Nvidia GeForce GT 640 Rebrand

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More render output processors 24 vs 16 8 more render output processors
Wider memory bus 192 bit vs 128 bit 50% wider memory bus
Lower TDP 75W vs 108W More than 30% lower TDP

Benchmarks Real world tests of Radeon HD 5770 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

CLBenchmark Raytrace Measures compute performance using OpenCL to do raytracing

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