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Differences What are the advantages of each

Front view of GeForce GT 645

Reasons to consider the
Nvidia GeForce GT 645

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Higher effective memory clock speed 3,828 MHz vs 1,800 MHz Around 2.2x higher effective memory clock speed
Higher memory bandwidth 91.9 GB/s vs 28.8 GB/s Around 3.2x higher memory bandwidth
Better PassMark score 2,479 vs 1,289 More than 90% better PassMark score
More render output processors 24 vs 16 8 more render output processors
Slightly 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 776 MHz More than 15% higher clock speed
Lower TDP 65W vs 102W More than 35% lower TDP

Benchmarks Real world tests of GeForce GT 645 vs 640

PassMark Industry standard benchmark for overall graphics card performanceData courtesy Passmark

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

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