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Differences What are the advantages of each

Front view of GeForce GTX 660M

Reasons to consider the
Nvidia GeForce GTX 660M

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Better PassMark score 1,412 vs 638 Around 2.2x better PassMark score
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
More memory 2,048 MB vs 1,024 MB 2x more memory
Slightly higher clock speed 835 MHz vs 775 MHz Around 10% higher clock speed
Slightly higher texture rate 26.72 GTexel/s vs 12.4 GTexel/s Around 2.2x higher texture rate
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
More texture mapping units 32 vs 16 Twice as many texture mapping units
Slightly more shading units 384 vs 192 Twice as many shading units
Higher memory clock speed 1,000 MHz vs 900 MHz More than 10% higher memory clock speed
Front view of GeForce 810A

Reasons to consider the
Nvidia GeForce 810A

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Lower TDP 15W vs 50W 3.3x lower TDP

Benchmarks Real world tests of GeForce GTX 660M vs 810A

PassMark Industry standard benchmark for overall graphics card performanceData courtesy Passmark

Features Key features of the GeForce GTX 660M  vs 810A 

memory bandwidth Rate at which data can be read from or stored in onboard memory

GeForce 810A
14.4 GB/s

pixel rate Number of pixels a graphics card can render to the screen every second

GeForce GTX 660M
6.68 GPixel/s
GeForce 810A
6.2 GPixel/s

texture rate Speed at which a graphics card can perform texture mapping

GeForce GTX 660M
26.72 GTexel/s
GeForce 810A
12.4 GTexel/s

floating point performance How fast the gpu can crunch numbers

GeForce GTX 660M
641.3 GFLOPS
GeForce 810A
297.6 GFLOPS

shading units Subcomponents of the gpu, these run in parallel to enable fast pixel shading

texture mapping units Built into each gpu, these resize and rotate bitmaps for texturing scenes

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