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Differences What are the advantages of each

Front view of GeForce GTX 555

Reasons to consider the
Generic GeForce GTX 555

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Significantly higher effective memory clock speed 3,828 MHz vs 1,800 MHz Around 2.2x higher effective memory clock speed
Significantly higher memory bandwidth 91.9 GB/s vs 28.8 GB/s Around 3.2x higher memory bandwidth
Better PassMark score 2,173 vs 1,282 Around 70% better PassMark score
More render output processors 24 vs 16 8 more render output processors
More texture mapping units 48 vs 32 16 more texture mapping units
Front view of GeForce GT 640

Reasons to consider the
Leadtek GeForce GT 640

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Higher clock speed 902 MHz vs 736 MHz Around 25% higher clock speed
Significantly lower TDP 65W vs 150W 2.3x lower TDP

Benchmarks Real world tests of GeForce GTX 555 vs GT 640

PassMark Industry standard benchmark for overall graphics card performanceData courtesy Passmark

Sky Diver Factor Data courtesy FutureMark

Cloud Gate Factor Data courtesy FutureMark

PassMark Direct Compute Measures performance of general-purpose computing using Microsoft DirectCompute

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