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Differences What are the advantages of each

Front view of GeForce GTX 980

Reasons to consider the
Nvidia GeForce GTX 980

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Much higher clock speed 1,127 MHz vs 500 MHz More than 2.2x higher clock speed
Much higher effective memory clock speed 7,012 MHz vs 1,584 MHz Around 4.5x higher effective memory clock speed
Significantly higher memory bandwidth 224.4 GB/s vs 25.34 GB/s More than 8.8x higher memory bandwidth
Significantly better floating-point performance 4,981 GFLOPS vs 80 GFLOPS More than 62.2x better floating-point performance
Much higher pixel rate 77.82 GPixel/s vs 4 GPixel/s Around 19.5x higher pixel rate
More memory 4,096 MB vs 256 MB 16x more memory
Significantly higher texture rate 155.6 GTexel/s vs 8 GTexel/s Around 19.5x higher texture rate
Many more render output processors 64 vs 8 56 more render output processors
Significantly more shading units 2,048 vs 32 2016 more shading units
Significantly more texture mapping units 128 vs 16 112 more texture mapping units
Much higher memory clock speed 1,753 MHz vs 792 MHz Around 2.2x higher memory clock speed
Front view of GeForce GT 120M Mac

Reasons to consider the
Nvidia GeForce GT 120M Mac

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Significantly lower TDP 14W vs 165W 11.8x lower TDP

Features Key features of the GeForce GTX 980  vs GT 120M Mac 

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

GeForce GTX 980
224.4 GB/s
GeForce GT 120M Mac
25.34 GB/s

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

GeForce GTX 980
77.82 GPixel/s
GeForce GT 120M Mac
4 GPixel/s

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

GeForce GTX 980
155.6 GTexel/s
GeForce GT 120M Mac
8 GTexel/s

floating point performance How fast the gpu can crunch numbers

GeForce GTX 980
4,981 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 980  vs
GT 120M Mac 
GPU brand Nvidia Nvidia
GPU name GM204 G96C
Market Desktop Laptop
Clock speed 1,127 MHz 500 MHz
Is dual GPU No No
Reference card None None

raw performance

Shading units 2,048 32
Texture mapping units 128 16
Render output processors 64 8
Pixel rate 77.82 GPixel/s 4 GPixel/s
Texture rate 155.6 GTexel/s 8 GTexel/s
Floating-point performance 4,981 GFLOPS 80 GFLOPS

memory

GeForce GTX 980  vs
GT 120M Mac 
Memory clock speed 1,753 MHz 792 MHz
Effective memory clock speed 7,012 MHz 1,584 MHz
Memory bus 256 bit 128 bit
Memory 4,096 MB 256 MB
Memory type GDDR5 GDDR3
Memory bandwidth 224.4 GB/s 25.34 GB/s

noise and power

TDP 165W 14W

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