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Differences What are the advantages of each

Front view of GeForce GTX 960M

Reasons to consider the
Nvidia GeForce GTX 960M

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Much higher clock speed 1,097 MHz vs 450 MHz Around 2.5x higher clock speed
Better floating-point performance 1,404.2 GFLOPS vs 91.2 GFLOPS Around 15.5x better floating-point performance
Higher pixel rate 17.55 GPixel/s vs 3.6 GPixel/s Around 5x higher pixel rate
Higher texture rate 43.9 GTexel/s vs 7.2 GTexel/s More than 6x higher texture rate
More shading units 640 vs 48 592 more shading units
More texture mapping units 40 vs 16 24 more texture mapping units
More render output processors 16 vs 8 Twice as many render output processors
Front view of GeForce 320M Mac

Reasons to consider the
Nvidia GeForce 320M Mac

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Lower TDP 23W vs 75W 3.3x lower TDP

Features Key features of the GeForce GTX 960M  vs 320M Mac 

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

GeForce GTX 960M
17.55 GPixel/s
GeForce 320M Mac
3.6 GPixel/s

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

GeForce GTX 960M
43.9 GTexel/s
GeForce 320M Mac
7.2 GTexel/s

floating point performance How fast the gpu can crunch numbers

GeForce GTX 960M
1,404.2 GFLOPS
GeForce 320M Mac
91.2 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

render output processors GPU commponents responsible for transform pixels as they flow between memory buffers

Specifications Full list of technical specs

gpu

GeForce GTX 960M  vs
320M Mac 
GPU brand Nvidia Nvidia
GPU name GM107 MCP89
Clock speed 1,097 MHz 450 MHz
Is dual GPU No No
Reference card None None

noise and power

TDP 75W 23W

raw performance

GeForce GTX 960M  vs
320M Mac 
Shading units 640 48
Texture mapping units 40 16
Render output processors 16 8
Pixel rate 17.55 GPixel/s 3.6 GPixel/s
Texture rate 43.9 GTexel/s 7.2 GTexel/s
Floating-point performance 1,404.2 GFLOPS 91.2 GFLOPS

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