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Differences What are the advantages of each

Front view of GeForce GTX 660

Reasons to consider the
Nvidia GeForce GTX 660

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Better PassMark score 4,121 vs 638 Around 6.5x better PassMark score
Significantly higher effective memory clock speed 5,600 MHz vs 1,800 MHz More than 3x higher effective memory clock speed
Significantly higher memory bandwidth 179.2 GB/s vs 14.4 GB/s Around 12.5x higher memory bandwidth
Better floating-point performance 1,896.2 GFLOPS vs 297.6 GFLOPS More than 6.2x better floating-point performance
Higher texture rate 79 GTexel/s vs 12.4 GTexel/s More than 6.2x higher texture rate
Significantly more texture mapping units 96 vs 16 80 more texture mapping units
More render output processors 32 vs 8 24 more render output processors
Slightly more memory 2,048 MB vs 1,024 MB 2x more memory
More shading units 1,152 vs 192 960 more shading units
Higher pixel rate 19.75 GPixel/s vs 6.2 GPixel/s Around 3.2x higher pixel rate
Significantly higher memory clock speed 1,400 MHz vs 900 MHz More than 55% higher memory clock speed
Wider memory bus 256 bit vs 64 bit 4x wider memory bus
Front view of GeForce 810A

Reasons to consider the
Nvidia GeForce 810A

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Significantly lower TDP 15W vs 130W 8.7x lower TDP

Benchmarks Real world tests of GeForce GTX 660 vs 810A

PassMark Industry standard benchmark for overall graphics card performanceData courtesy Passmark

Features Key features of the GeForce GTX 660  vs 810A 

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

GeForce GTX 660
179.2 GB/s
GeForce 810A
14.4 GB/s

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

GeForce GTX 660
19.75 GPixel/s
GeForce 810A
6.2 GPixel/s

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

GeForce GTX 660
79 GTexel/s
GeForce 810A
12.4 GTexel/s

floating point performance How fast the gpu can crunch numbers

GeForce GTX 660
1,896.2 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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