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Differences What are the advantages of each

Front view of Radeon HD 6950M

Reasons to consider the
AMD Radeon HD 6950M

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Higher memory bandwidth 115.2 GB/s vs 80 GB/s Around 45% higher memory bandwidth
Higher pixel rate 18.56 GPixel/s vs 7.6 GPixel/s Around 2.5x higher pixel rate
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
More shading units 960 vs 384 576 more shading units
More texture mapping units 48 vs 32 16 more texture mapping units
Front view of GeForce GTX 660M Mac

Reasons to consider the
Nvidia GeForce GTX 660M Mac

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Significantly higher clock speed 950 MHz vs 580 MHz Around 65% higher clock speed
Higher effective memory clock speed 5,000 MHz vs 3,600 MHz Around 40% higher effective memory clock speed
Significantly higher memory clock speed 1,250 MHz vs 900 MHz Around 40% higher memory clock speed

Features Key features of the Radeon HD 6950M  vs GeForce GTX 660M 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 6950M
18.56 GPixel/s
GeForce GTX 660M Mac
7.6 GPixel/s

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

Radeon HD 6950M
27.84 GTexel/s
GeForce GTX 660M Mac
30.4 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon HD 6950M
1,113.6 GFLOPS
GeForce GTX 660M Mac
729.6 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 6950M  vs
GeForce GTX 660M Mac 
GPU brand AMD Nvidia
GPU name Blackcomb GK107
Market Laptop Laptop
Clock speed 580 MHz 950 MHz
Is dual GPU No No
Reference card None None

raw performance

Shading units 960 384
Texture mapping units 48 32
Render output processors 32 16
Pixel rate 18.56 GPixel/s 7.6 GPixel/s
Texture rate 27.84 GTexel/s 30.4 GTexel/s
Floating-point performance 1,113.6 GFLOPS 729.6 GFLOPS

memory

Radeon HD 6950M  vs
GeForce GTX 660M Mac 
Memory clock speed 900 MHz 1,250 MHz
Effective memory clock speed 3,600 MHz 5,000 MHz
Memory bus 256 bit 128 bit
Memory 1,024 MB 512 MB
Memory type GDDR5 GDDR5
Memory bandwidth 115.2 GB/s 80 GB/s

noise and power

TDP 50W 50W

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