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Differences What are the advantages of each

Front view of Radeon HD 7770

Reasons to consider the
AMD Radeon HD 7770

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Much higher effective memory clock speed 4,500 MHz vs 1,600 MHz More than 2.8x higher effective memory clock speed
Significantly better 3DMark06 score 19,307 vs 13,300 More than 45% better 3DMark06 score
Higher clock speed 1,000 MHz vs 720 MHz Around 40% higher clock speed
Higher memory bandwidth 72 GB/s vs 38.4 GB/s Around 90% higher memory bandwidth
Better 3DMark vantage graphics score 13,398 vs 9,030 Around 50% better 3DMark vantage graphics score
Better floating-point performance 1,280 GFLOPS vs 414.7 GFLOPS More than 3x better floating-point performance
Higher texture rate 40 GTexel/s vs 17.28 GTexel/s More than 2.2x higher texture rate
Higher pixel rate 16 GPixel/s vs 4.32 GPixel/s Around 3.8x higher pixel rate
More shading units 640 vs 144 496 more shading units
Significantly higher memory clock speed 1,125 MHz vs 800 MHz More than 40% higher memory clock speed
More texture mapping units 40 vs 24 16 more texture mapping units
Front view of GeForce GT 640 Rebrand

Reasons to consider the
ASUS GeForce GT 640 Rebrand

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More memory 3,072 MB vs 1,024 MB 3x more memory
More render output processors 24 vs 16 8 more render output processors
Wider memory bus 192 bit vs 128 bit 50% wider memory bus

Benchmarks Real world tests of Radeon HD 7770 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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