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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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Significantly lower TDP 35W vs 122W 3.5x lower TDP
Front view of GeForce GTX 880M

Reasons to consider the
Nvidia GeForce GTX 880M

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Much more memory 8,192 MB vs 512 MB 16x more memory
Higher clock speed 954 MHz vs 725 MHz More than 30% higher clock speed
Significantly higher memory bandwidth 160 GB/s vs 57.6 GB/s More than 2.8x higher memory bandwidth
Significantly better floating-point performance 2,930.7 GFLOPS vs 696 GFLOPS Around 4.2x better floating-point performance
Significantly higher texture rate 122.1 GTexel/s vs 17.4 GTexel/s More than 7x higher texture rate
Many more texture mapping units 128 vs 24 104 more texture mapping units
Higher pixel rate 30.53 GPixel/s vs 5.8 GPixel/s More than 5.2x higher pixel rate
Higher effective memory clock speed 5,000 MHz vs 3,600 MHz Around 40% higher effective memory clock speed
Significantly more shading units 1,536 vs 480 1056 more shading units
Significantly more render output processors 32 vs 8 24 more render output processors
Significantly wider memory bus 256 bit vs 128 bit 2x wider memory bus
Significantly higher memory clock speed 1,250 MHz vs 900 MHz Around 40% higher memory clock speed

Features Key features of the Radeon HD 6770M Mac  vs GeForce GTX 880M 

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 880M
30.53 GPixel/s

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

Radeon HD 6770M Mac
17.4 GTexel/s
GeForce GTX 880M
122.1 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon HD 6770M Mac
696 GFLOPS
GeForce GTX 880M
2,930.7 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 6770M Mac  vs
GeForce GTX 880M 
GPU brand AMD Nvidia
GPU name Whistler GK104
Market Laptop Laptop
Clock speed 725 MHz 954 MHz
Is dual GPU No No
Reference card None None

raw performance

Shading units 480 1,536
Texture mapping units 24 128
Render output processors 8 32
Pixel rate 5.8 GPixel/s 30.53 GPixel/s
Texture rate 17.4 GTexel/s 122.1 GTexel/s
Floating-point performance 696 GFLOPS 2,930.7 GFLOPS

memory

Radeon HD 6770M Mac  vs
GeForce GTX 880M 
Memory clock speed 900 MHz 1,250 MHz
Effective memory clock speed 3,600 MHz 5,000 MHz
Memory bus 128 bit 256 bit
Memory 512 MB 8,192 MB
Memory type GDDR5 GDDR5
Memory bandwidth 57.6 GB/s 160 GB/s

noise and power

TDP 35W 122W

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