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Differences What are the advantages of each

Front view of GeForce GTX 645

Reasons to consider the
Nvidia GeForce GTX 645

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Significantly higher effective memory clock speed 4,000 MHz vs 1,800 MHz Around 2.2x higher effective memory clock speed
Higher memory bandwidth 64 GB/s vs 14.4 GB/s Around 4.5x higher memory bandwidth
Better PassMark score 1,920 vs 923 More than 2x better PassMark score
Higher texture rate 39.6 GTexel/s vs 15.47 GTexel/s More than 2.5x higher texture rate
More texture mapping units 48 vs 16 Three times as many texture mapping units
More render output processors 16 vs 8 Twice as many render output processors
Wider memory bus 128 bit vs 64 bit 2x wider memory bus
Slightly more shading units 576 vs 384 192 more shading units
Higher memory clock speed 1,000 MHz vs 900 MHz More than 10% higher memory clock speed
Front view of GeForce GT 635

Reasons to consider the
Nvidia GeForce GT 635

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Higher clock speed 967 MHz vs 824 MHz More than 15% higher clock speed
Lower TDP 35W vs 65W More than 45% lower TDP

Benchmarks Real world tests of GeForce GTX 645 vs GT 635

PassMark Industry standard benchmark for overall graphics card performanceData courtesy Passmark

T-Rex (GFXBench 3.0) Data courtesy CompuBench

GeForce GTX 645
GeForce GT 635

Manhattan (GFXBench 3.0) Data courtesy CompuBench

GeForce GTX 645
GeForce GT 635

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

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