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Differences What are the advantages of each

Front view of Radeon R9 390

Reasons to consider the
AMD Radeon R9 390

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Much higher clock speed 1,000 MHz vs 450 MHz Around 2.2x higher clock speed
Significantly better floating-point performance 5,120 GFLOPS vs 91.2 GFLOPS Around 56.2x better floating-point performance
Significantly higher pixel rate 64 GPixel/s vs 3.6 GPixel/s More than 17.8x higher pixel rate
Significantly higher texture rate 160 GTexel/s vs 7.2 GTexel/s Around 22.2x higher texture rate
Many more render output processors 64 vs 8 56 more render output processors
Many more shading units 2,560 vs 48 2512 more shading units
Many more texture mapping units 160 vs 16 144 more texture mapping units
Front view of GeForce 320M Mac

Reasons to consider the
Nvidia GeForce 320M Mac

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Much lower TDP 23W vs 275W 12x lower TDP

Features Key features of the Radeon R9 390  vs GeForce 320M Mac 

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

Radeon R9 390
64 GPixel/s
GeForce 320M Mac
3.6 GPixel/s

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

Radeon R9 390
160 GTexel/s
GeForce 320M Mac
7.2 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon R9 390
5,120 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

Radeon R9 390  vs
GeForce 320M Mac 
GPU brand AMD Nvidia
GPU name Grenada MCP89
Clock speed 1,000 MHz 450 MHz
Is dual GPU No No
Reference card None None

noise and power

TDP 275W 23W

raw performance

Radeon R9 390  vs
GeForce 320M Mac 
Shading units 2,560 48
Texture mapping units 160 16
Render output processors 64 8
Pixel rate 64 GPixel/s 3.6 GPixel/s
Texture rate 160 GTexel/s 7.2 GTexel/s
Floating-point performance 5,120 GFLOPS 91.2 GFLOPS

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