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Differences What are the advantages of each

Front view of Radeon HD 8950M

Reasons to consider the
AMD Radeon HD 8950M

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More compute units 16 vs 12 4 more compute units
Higher memory clock speed 1,000 MHz vs 900 MHz More than 10% higher memory clock speed
Front view of Radeon HD 6970M Mac

Reasons to consider the
AMD Radeon HD 6970M Mac

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Higher memory bandwidth 115.2 GB/s vs 64 GB/s 80% higher memory bandwidth
More render output processors 32 vs 16 Twice as many render output processors
Significantly wider memory bus 256 bit vs 128 bit 2x wider memory bus
Higher pixel rate 21.76 GPixel/s vs 11.2 GPixel/s Around 95% higher pixel rate

Features Key features of the Radeon HD 8950M  vs 6970M Mac 

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

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

Radeon HD 8950M
11.2 GPixel/s
Radeon HD 6970M Mac
21.76 GPixel/s

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

Radeon HD 8950M
39.2 GTexel/s
Radeon HD 6970M Mac
32.6 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon HD 8950M
1,254 GFLOPS
Radeon HD 6970M Mac
1,305.6 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

Radeon HD 8950M  vs
6970M Mac 
GPU brand AMD AMD
GPU name Saturn Blackcomb
Market Laptop Laptop
Clock speed 700 MHz 680 MHz
Is dual GPU No No
Reference card None None

raw performance

Shading units 896 960
Texture mapping units 56 48
Render output processors 16 32
Compute units 16 12
Pixel rate 11.2 GPixel/s 21.76 GPixel/s
Texture rate 39.2 GTexel/s 32.6 GTexel/s
Floating-point performance 1,254 GFLOPS 1,305.6 GFLOPS

memory

Radeon HD 8950M  vs
6970M Mac 
Memory clock speed 1,000 MHz 900 MHz
Effective memory clock speed 4,000 MHz 3,600 MHz
Memory bus 128 bit 256 bit
Memory 2,048 MB 2,048 MB
Memory type GDDR5 GDDR5
Memory bandwidth 64 GB/s 115.2 GB/s

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