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Differences What are the advantages of each

Front view of GeForce 9400M G

Reasons to consider the
Nvidia GeForce 9400M G

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Slightly lower TDP 12W vs 23W Around 50% lower TDP
Front view of GeForce 320M Mac

Reasons to consider the
Nvidia GeForce 320M Mac

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Slightly more render output processors 8 vs 4 Twice as many render output processors
Slightly more texture mapping units 16 vs 8 Twice as many texture mapping units

Features Key features of the GeForce 9400M G  vs 320M Mac 

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

GeForce 9400M G
1.8 GPixel/s
GeForce 320M Mac
3.6 GPixel/s

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

GeForce 9400M G
3.6 GTexel/s
GeForce 320M Mac
7.2 GTexel/s

floating point performance How fast the gpu can crunch numbers

GeForce 9400M G
35.2 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 9400M G  vs
320M Mac 
GPU brand Nvidia Nvidia
GPU name C79MX MCP89
Clock speed 450 MHz 450 MHz
Is dual GPU No No
Reference card None None

noise and power

TDP 12W 23W

raw performance

GeForce 9400M G  vs
320M Mac 
Shading units 16 48
Texture mapping units 8 16
Render output processors 4 8
Pixel rate 1.8 GPixel/s 3.6 GPixel/s
Texture rate 3.6 GTexel/s 7.2 GTexel/s
Floating-point performance 35.2 GFLOPS 91.2 GFLOPS

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