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Differences What are the advantages of each

Front view of Radeon HD 6750M Mac

Reasons to consider the
AMD Radeon HD 6750M Mac

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Slightly lower TDP 35W vs 50W 30% lower TDP
Front view of GeForce GTX 660M

Reasons to consider the
Nvidia GeForce GTX 660M

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Higher clock speed 835 MHz vs 598 MHz Around 40% higher clock speed
More memory 2,048 MB vs 512 MB 4x more memory
Higher effective memory clock speed 4,000 MHz vs 3,176 MHz More than 25% higher effective memory clock speed
More render output processors 16 vs 8 Twice as many render output processors
Higher memory clock speed 1,000 MHz vs 794 MHz More than 25% higher memory clock speed

Features Key features of the Radeon HD 6750M Mac  vs GeForce GTX 660M 

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 6750M Mac
4.78 GPixel/s
GeForce GTX 660M
6.68 GPixel/s

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

Radeon HD 6750M Mac
14.35 GTexel/s
GeForce GTX 660M
26.72 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon HD 6750M Mac
574.1 GFLOPS
GeForce GTX 660M
641.3 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 6750M Mac  vs
GeForce GTX 660M 
GPU brand AMD Nvidia
GPU name Whistler GK107
Market Laptop Laptop
Clock speed 598 MHz 835 MHz
Is dual GPU No No
Reference card None None

raw performance

Shading units 480 384
Texture mapping units 24 32
Render output processors 8 16
Pixel rate 4.78 GPixel/s 6.68 GPixel/s
Texture rate 14.35 GTexel/s 26.72 GTexel/s
Floating-point performance 574.1 GFLOPS 641.3 GFLOPS

memory

Radeon HD 6750M Mac  vs
GeForce GTX 660M 
Memory clock speed 794 MHz 1,000 MHz
Effective memory clock speed 3,176 MHz 4,000 MHz
Memory bus 128 bit 128 bit
Memory 512 MB 2,048 MB
Memory type GDDR5 GDDR5
Memory bandwidth 50.8 GB/s 64 GB/s

noise and power

TDP 35W 50W

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