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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 5,600 MHz vs 1,600 MHz 3.5x higher effective memory clock speed
Much higher memory bandwidth 179.2 GB/s vs 25.6 GB/s Around 7x higher memory bandwidth
Higher clock speed 823 MHz vs 550 MHz Around 50% higher clock speed
Better floating-point performance 1,896.2 GFLOPS vs 89.6 GFLOPS Around 21.2x better floating-point performance
Significantly higher texture rate 79 GTexel/s vs 8.8 GTexel/s Around 9x higher texture rate
More memory 2,048 MB vs 512 MB 4x more memory
Significantly more texture mapping units 96 vs 16 80 more texture mapping units
Significantly more shading units 1,152 vs 32 1120 more shading units
Significantly more render output processors 32 vs 8 24 more render output processors
Higher pixel rate 19.75 GPixel/s vs 4.4 GPixel/s Around 4.5x higher pixel rate
Much higher memory clock speed 1,400 MHz vs 800 MHz 75% higher memory clock speed
Wider memory bus 256 bit vs 128 bit 2x wider memory bus
Front view of GeForce GT 120 Mac

Reasons to consider the
Nvidia GeForce GT 120 Mac

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Lower TDP 50W vs 130W 2.6x lower TDP

Features Key features of the GeForce GTX 660  vs GT 120 Mac 

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

GeForce GTX 660
179.2 GB/s
GeForce GT 120 Mac
25.6 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 GT 120 Mac
4.4 GPixel/s

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

GeForce GTX 660
79 GTexel/s
GeForce GT 120 Mac
8.8 GTexel/s

floating point performance How fast the gpu can crunch numbers

GeForce GTX 660
1,896.2 GFLOPS
GeForce GT 120 Mac
89.6 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

Specifications Full list of technical specs

gpu

GeForce GTX 660  vs
GT 120 Mac 
GPU brand Nvidia Nvidia
GPU name GK104 G96 C1
Market Desktop Desktop
Clock speed 823 MHz 550 MHz
Is dual GPU No No
Reference card Nvidia GeForce GTX 660 980 MHz 2 GB None

raw performance

Shading units 1,152 32
Texture mapping units 96 16
Render output processors 32 8
Pixel rate 19.75 GPixel/s 4.4 GPixel/s
Texture rate 79 GTexel/s 8.8 GTexel/s
Floating-point performance 1,896.2 GFLOPS 89.6 GFLOPS

memory

GeForce GTX 660  vs
GT 120 Mac 
Memory clock speed 1,400 MHz 800 MHz
Effective memory clock speed 5,600 MHz 1,600 MHz
Memory bus 256 bit 128 bit
Memory 2,048 MB 512 MB
Memory type GDDR5 GDDR3
Memory bandwidth 179.2 GB/s 25.6 GB/s

noise and power

TDP 130W 50W

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