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Differences What are the advantages of each

Front view of GeForce GT 640M

Reasons to consider the
Nvidia GeForce GT 640M

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More memory 2,048 MB vs 1,024 MB 2x more memory
Slightly higher texture rate 20 GTexel/s vs 5.9 GTexel/s Around 3.5x higher texture rate
More texture mapping units 32 vs 8 24 more texture mapping units
More shading units 384 vs 48 336 more shading 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
Front view of GeForce 810M

Reasons to consider the
Nvidia GeForce 810M

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Higher clock speed 738 MHz vs 625 MHz Around 20% higher clock speed
Slightly lower TDP 15W vs 32W 2.1x lower TDP

Benchmarks Real world tests of GeForce GT 640M vs 810M

PassMark Industry standard benchmark for overall graphics card performanceData courtesy Passmark

Face detection Data courtesy CompuBench

GeForce GT 640M
7.82 mPixels/s
GeForce 810M
4.4 mPixels/s

Ocean surface simulation Data courtesy CompuBench

GeForce GT 640M
270.8 frames/s
GeForce 810M
131.24 frames/s

Particle simulation Data courtesy CompuBench

GeForce GT 640M
100.37 mInteraction/s
GeForce 810M
44.03 mInteraction/s

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