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Differences What are the advantages of each

Front view of Radeon HD 6770M Mac

Reasons to consider the
AMD Radeon HD 6770M Mac

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

Reasons to consider the
Nvidia GeForce GTX 660M Mac

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Higher clock speed 950 MHz vs 725 MHz More than 30% higher clock speed
Higher effective memory clock speed 5,000 MHz vs 3,600 MHz Around 40% higher effective memory clock speed
Higher memory bandwidth 80 GB/s vs 57.6 GB/s Around 40% higher memory bandwidth
Significantly higher memory clock speed 1,250 MHz vs 900 MHz Around 40% higher memory clock speed
More render output processors 16 vs 8 Twice as many render output processors

Features Key features of the Radeon HD 6770M Mac  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 6770M Mac
5.8 GPixel/s
GeForce GTX 660M Mac
7.6 GPixel/s

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

Radeon HD 6770M Mac
17.4 GTexel/s
GeForce GTX 660M Mac
30.4 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon HD 6770M Mac
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


Radeon HD 6770M Mac  vs
GeForce GTX 660M Mac 
GPU brand AMD Nvidia
GPU name Whistler GK107
Market Laptop Laptop
Clock speed 725 MHz 950 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 5.8 GPixel/s 7.6 GPixel/s
Texture rate 17.4 GTexel/s 30.4 GTexel/s
Floating-point performance 696 GFLOPS 729.6 GFLOPS


Radeon HD 6770M Mac  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 128 bit 128 bit
Memory 512 MB 512 MB
Memory type GDDR5 GDDR5
Memory bandwidth 57.6 GB/s 80 GB/s

noise and power

TDP 35W 50W


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