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Differences What are the advantages of each

Front view of GeForce GTX 680

Reasons to consider the
Nvidia GeForce GTX 680

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Much higher effective memory clock speed 6,008 MHz vs 1,600 MHz More than 3.8x higher effective memory clock speed
Much higher memory bandwidth 192.3 GB/s vs 25.6 GB/s More than 7.5x higher memory bandwidth
Significantly higher clock speed 1,006 MHz vs 550 MHz Around 85% higher clock speed
Significantly better floating-point performance 3,090.4 GFLOPS vs 89.6 GFLOPS Around 34.5x better floating-point performance
Much higher texture rate 128.8 GTexel/s vs 8.8 GTexel/s Around 14.8x higher texture rate
Many more texture mapping units 128 vs 16 112 more texture mapping units
More memory 2,048 MB vs 512 MB 4x more memory
Higher pixel rate 32.2 GPixel/s vs 4.4 GPixel/s More than 7.2x higher pixel rate
Many more shading units 1,536 vs 32 1504 more shading units
Significantly more render output processors 32 vs 8 24 more render output processors
Much higher memory clock speed 1,502 MHz vs 800 MHz Around 90% 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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Much lower TDP 50W vs 195W 3.9x lower TDP

Features Key features of the GeForce GTX 680  vs GT 120 Mac 

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

GeForce GTX 680
192.3 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 680
32.2 GPixel/s
GeForce GT 120 Mac
4.4 GPixel/s

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

GeForce GTX 680
128.8 GTexel/s
GeForce GT 120 Mac
8.8 GTexel/s

floating point performance How fast the gpu can crunch numbers

GeForce GTX 680
3,090.4 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 680  vs
GT 120 Mac 
GPU brand Nvidia Nvidia
GPU name GK104 G96 C1
Market Desktop Desktop
Clock speed 1,006 MHz 550 MHz
Is dual GPU No No
Reference card None None

raw performance

Shading units 1,536 32
Texture mapping units 128 16
Render output processors 32 8
Pixel rate 32.2 GPixel/s 4.4 GPixel/s
Texture rate 128.8 GTexel/s 8.8 GTexel/s
Floating-point performance 3,090.4 GFLOPS 89.6 GFLOPS

memory

GeForce GTX 680  vs
GT 120 Mac 
Memory clock speed 1,502 MHz 800 MHz
Effective memory clock speed 6,008 MHz 1,600 MHz
Memory bus 256 bit 128 bit
Memory 2,048 MB 512 MB
Memory type GDDR5 GDDR3
Memory bandwidth 192.3 GB/s 25.6 GB/s

noise and power

TDP 195W 50W

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