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Differences What are the advantages of each

Front view of GeForce GTX 660M Mac

Reasons to consider the
Nvidia GeForce GTX 660M Mac

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Higher clock speed 950 MHz vs 700 MHz More than 35% higher clock speed
Significantly higher effective memory clock speed 5,000 MHz vs 2,020 MHz Around 2.5x higher effective memory clock speed
Higher memory clock speed 1,250 MHz vs 1,010 MHz Around 25% higher memory clock speed
Slightly more shading units 384 vs 112 272 more shading units
Lower TDP 50W vs 125W 2.5x lower TDP
Front view of GeForce GT 8800

Reasons to consider the
ASUS GeForce GT 8800

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More texture mapping units 56 vs 32 24 more texture mapping units

Features Key features of the GeForce GTX 660M Mac  vs GT 8800 

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

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

GeForce GTX 660M Mac
7.6 GPixel/s
GeForce GT 8800
11.2 GPixel/s

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

GeForce GTX 660M Mac
30.4 GTexel/s
GeForce GT 8800
39.2 GTexel/s

floating point performance How fast the gpu can crunch numbers

GeForce GTX 660M Mac
729.6 GFLOPS
GeForce GT 8800
392 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

Specifications Full list of technical specs

gpu

GeForce GTX 660M Mac  vs
GT 8800 
GPU brand Nvidia Nvidia
GPU name GK107 G92
Market Laptop Desktop
Clock speed 950 MHz 700 MHz
Is dual GPU No No
Reference card None Nvidia GeForce GT 8800 GT 600 MHz 512 MB

raw performance

Shading units 384 112
Texture mapping units 32 56
Render output processors 16 16
Pixel rate 7.6 GPixel/s 11.2 GPixel/s
Texture rate 30.4 GTexel/s 39.2 GTexel/s
Floating-point performance 729.6 GFLOPS 392 GFLOPS

memory

GeForce GTX 660M Mac  vs
GT 8800 
Memory clock speed 1,250 MHz 1,010 MHz
Effective memory clock speed 5,000 MHz 2,020 MHz
Memory bus 128 bit 256 bit
Memory 512 MB 512 MB
Memory type GDDR5 GDDR3
Memory bandwidth 80 GB/s 64.6 GB/s

noise and power

TDP 50W 125W

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