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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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Much lower TDP 75W vs 250W 3.3x lower TDP
Front view of Radeon HD 6970

Reasons to consider the
AMD Radeon HD 6970

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Higher clock speed 880 MHz vs 680 MHz Around 30% higher clock speed
Higher effective memory clock speed 5,500 MHz vs 3,600 MHz Around 55% higher effective memory clock speed
Higher memory bandwidth 176 GB/s vs 115.2 GB/s Around 55% higher memory bandwidth
Better floating-point performance 2,703 GFLOPS vs 1,305.6 GFLOPS More than 2x better floating-point performance
Higher texture rate 84.48 GTexel/s vs 32.6 GTexel/s More than 2.5x higher texture rate
More texture mapping units 96 vs 48 Twice as many texture mapping units
Significantly higher memory clock speed 1,375 MHz vs 900 MHz Around 55% higher memory clock speed
More shading units 1,536 vs 960 576 more shading units
More compute units 24 vs 12 Twice as many compute units

Features Key features of the Radeon HD 6970M Mac  vs 6970 

memory bandwidth Rate at which data can be read from or stored in onboard memory

Radeon HD 6970M Mac
115.2 GB/s
Radeon HD 6970
176 GB/s

pixel rate Number of pixels a graphics card can render to the screen every second

Radeon HD 6970M Mac
21.76 GPixel/s
Radeon HD 6970
28.16 GPixel/s

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

Radeon HD 6970M Mac
32.6 GTexel/s
Radeon HD 6970
84.48 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon HD 6970M Mac
1,305.6 GFLOPS
Radeon HD 6970
2,703 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 6970M Mac  vs
GPU name Blackcomb Cayman XT
Market Laptop Desktop
Clock speed 680 MHz 880 MHz
Is dual GPU No No
Reference card None None

raw performance

Shading units 960 1,536
Texture mapping units 48 96
Render output processors 32 32
Compute units 12 24
Pixel rate 21.76 GPixel/s 28.16 GPixel/s
Texture rate 32.6 GTexel/s 84.48 GTexel/s
Floating-point performance 1,305.6 GFLOPS 2,703 GFLOPS


Radeon HD 6970M Mac  vs
Memory clock speed 900 MHz 1,375 MHz
Effective memory clock speed 3,600 MHz 5,500 MHz
Memory bus 256 bit 256 bit
Memory 2,048 MB 2,048 MB
Memory type GDDR5 GDDR5
Memory bandwidth 115.2 GB/s 176 GB/s

noise and power

TDP 75W 250W


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