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Differences What are the advantages of each

Front view of Radeon HD 6870

Reasons to consider the
MSI Radeon HD 6870

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Significantly higher clock speed 930 MHz vs 450 MHz More than 2x higher clock speed
Better floating-point performance 2,083 GFLOPS vs 91.2 GFLOPS More than 22.8x better floating-point performance
Higher pixel rate 29.76 GPixel/s vs 3.6 GPixel/s More than 8.2x higher pixel rate
More render output processors 32 vs 8 24 more render output processors
More shading units 1,120 vs 48 1072 more shading units
Higher texture rate 52.08 GTexel/s vs 7.2 GTexel/s Around 7.2x higher texture rate
More texture mapping units 56 vs 16 40 more texture mapping units
Front view of GeForce 320M Mac

Reasons to consider the
Nvidia GeForce 320M Mac

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Significantly lower TDP 23W vs 151W 6.6x lower TDP

Features Key features of the Radeon HD 6870  vs GeForce 320M Mac 

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

Radeon HD 6870
29.76 GPixel/s
GeForce 320M Mac
3.6 GPixel/s

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

Radeon HD 6870
52.08 GTexel/s
GeForce 320M Mac
7.2 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon HD 6870
2,083 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 HD 6870  vs
GeForce 320M Mac 
GPU brand AMD Nvidia
GPU name Barts XT MCP89
Clock speed 930 MHz 450 MHz
Is dual GPU No No
Reference card AMD Radeon HD 6870 900 MHz 1 GB None

noise and power

TDP 151W 23W

raw performance

Radeon HD 6870  vs
GeForce 320M Mac 
Shading units 1,120 48
Texture mapping units 56 16
Render output processors 32 8
Pixel rate 29.76 GPixel/s 3.6 GPixel/s
Texture rate 52.08 GTexel/s 7.2 GTexel/s
Floating-point performance 2,083 GFLOPS 91.2 GFLOPS

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