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Differences What are the advantages of each

Front view of Radeon HD 6970M Mac

Reasons to consider the
AMD Radeon HD 6970M Mac

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More memory 2,048 MB vs 1,024 MB 2x more memory
Lower TDP 75W vs 100W 25% lower TDP
Front view of GeForce GTX 675MX Mac

Reasons to consider the
Nvidia GeForce GTX 675MX Mac

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Higher effective memory clock speed 5,000 MHz vs 3,600 MHz Around 40% higher effective memory clock speed
Higher memory bandwidth 160 GB/s vs 115.2 GB/s Around 40% higher memory bandwidth
Higher texture rate 80.5 GTexel/s vs 32.6 GTexel/s Around 2.5x higher texture rate
Significantly more texture mapping units 112 vs 48 64 more texture mapping units
Better floating-point performance 1,932.7 GFLOPS vs 1,305.6 GFLOPS Around 50% better floating-point performance
Significantly higher memory clock speed 1,250 MHz vs 900 MHz Around 40% higher memory clock speed
More shading units 1,344 vs 960 384 more shading units

Features Key features of the Radeon HD 6970M Mac  vs GeForce GTX 675MX 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 6970M Mac
21.76 GPixel/s
GeForce GTX 675MX Mac
20.13 GPixel/s

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

Radeon HD 6970M Mac
32.6 GTexel/s
GeForce GTX 675MX Mac
80.5 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon HD 6970M Mac
1,305.6 GFLOPS
GeForce GTX 675MX Mac
1,932.7 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 6970M Mac  vs
GeForce GTX 675MX Mac 
GPU brand AMD Nvidia
GPU name Blackcomb GK104
Market Laptop Laptop
Clock speed 680 MHz 719 MHz
Is dual GPU No No
Reference card None None

raw performance

Shading units 960 1,344
Texture mapping units 48 112
Render output processors 32 32
Pixel rate 21.76 GPixel/s 20.13 GPixel/s
Texture rate 32.6 GTexel/s 80.5 GTexel/s
Floating-point performance 1,305.6 GFLOPS 1,932.7 GFLOPS

memory

Radeon HD 6970M Mac  vs
GeForce GTX 675MX Mac 
Memory clock speed 900 MHz 1,250 MHz
Effective memory clock speed 3,600 MHz 5,000 MHz
Memory bus 256 bit 256 bit
Memory 2,048 MB 1,024 MB
Memory type GDDR5 GDDR5
Memory bandwidth 115.2 GB/s 160 GB/s

noise and power

TDP 75W 100W

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