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Differences What are the advantages of each

Front view of Radeon HD 7470

Reasons to consider the
AMD Radeon HD 7470

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Significantly higher effective memory clock speed 3,600 MHz vs 1,600 MHz 2.2x higher effective memory clock speed
Higher memory clock speed 900 MHz vs 800 MHz Around 15% higher memory clock speed
Lower TDP 27W vs 75W 2.8x lower TDP
Front view of GeForce GT 640 Rebrand

Reasons to consider the
Nvidia GeForce GT 640 Rebrand

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Much better 3DMark06 score 13,300 vs 4,270 More than 3x better 3DMark06 score
Better 3DMark vantage graphics score 9,030 vs 1,630 More than 5.5x better 3DMark vantage graphics score
Slightly better 3DMark 11 graphics score 2,310 vs 590 Around 4x better 3DMark 11 graphics score
More render output processors 24 vs 4 20 more render output processors
Wider memory bus 192 bit vs 64 bit 3x wider memory bus
More texture mapping units 24 vs 8 Three times as many texture mapping units

Benchmarks Real world tests of Radeon HD 7470 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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