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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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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 2,215 vs 1,282 Around 75% 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
Wider memory bus 192 bit vs 128 bit 50% wider memory bus
Better PassMark direct compute score 1,211 vs 684 More than 75% better PassMark direct compute score
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

Fire Strike Factor Data courtesy FutureMark

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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