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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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Much higher effective memory clock speed 6,008 MHz vs 1,802 MHz More than 3.2x higher effective memory clock speed
Better passmark score 4,116 vs 843 Around 5x better passmark score
Higher clock speed 980 MHz vs 810 MHz More than 20% higher clock speed
Higher memory bandwidth 144.2 GB/s vs 28.8 GB/s More than 5x higher memory bandwidth
Better floating-point performance 1,882 GFLOPS vs 622.1 GFLOPS More than 3x better floating-point performance
Higher texture rate 78.4 GTexel/s vs 25.9 GTexel/s More than 3x higher texture rate
Higher pixel rate 19.6 GPixel/s vs 6.48 GPixel/s More than 3x higher pixel rate
Much higher memory clock speed 1,502 MHz vs 901 MHz More than 65% higher memory clock speed
More texture mapping units 80 vs 32 48 more texture mapping units
More shading units 960 vs 384 576 more shading units
More render output processors 24 vs 16 8 more render output processors
Wider memory bus 192 bit vs 128 bit 50% wider memory bus
Front view of GeForce GT 740M

Reasons to consider the
Nvidia GeForce GT 740M

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Lower TDP 45W vs 140W 3.1x lower TDP

Benchmarks Real world tests of GeForce GTX 660 vs GT 740M

Passmark Industry standard benchmark for overall graphics card performance

Features Key features of the GeForce GTX 660  vs GT 740M 

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

GeForce GTX 660
144.2 GB/s
GeForce GT 740M
28.8 GB/s

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

GeForce GTX 660
19.6 GPixel/s
GeForce GT 740M
6.48 GPixel/s

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

GeForce GTX 660
78.4 GTexel/s
GeForce GT 740M
25.9 GTexel/s

floating point performance How fast the gpu can crunch numbers

GeForce GTX 660
1,882 GFLOPS
GeForce GT 740M
622.1 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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