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Differences What are the advantages of each

Front view of Radeon HD 6970M

Reasons to consider the
AMD Radeon HD 6970M

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Higher memory bandwidth 115.2 GB/s vs 57.6 GB/s 2x higher memory bandwidth
Higher pixel rate 21.76 GPixel/s vs 5.8 GPixel/s More than 3.8x higher pixel rate
Significantly more render output processors 32 vs 8 24 more render output processors
Better floating-point performance 1,305.6 GFLOPS vs 696 GFLOPS Around 90% better floating-point performance
Significantly wider memory bus 256 bit vs 128 bit 2x wider memory bus
More shading units 960 vs 480 Twice as many shading units
Higher texture rate 32.6 GTexel/s vs 17.4 GTexel/s More than 85% higher texture rate
More texture mapping units 48 vs 24 Twice as many texture mapping units
More compute units 12 vs 6 Twice as many compute units
Front view of Radeon HD 6770M Mac

Reasons to consider the
AMD Radeon HD 6770M Mac

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Lower TDP 35W vs 75W 2.1x lower TDP

Features Key features of the Radeon HD 6970M  vs 6770M Mac 

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

Radeon HD 6970M
115.2 GB/s

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

Radeon HD 6970M
21.76 GPixel/s
Radeon HD 6770M Mac
5.8 GPixel/s

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

Radeon HD 6970M
32.6 GTexel/s
Radeon HD 6770M Mac
17.4 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon HD 6970M
1,305.6 GFLOPS
Radeon HD 6770M Mac
696 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  vs
6770M Mac 
GPU brand AMD AMD
GPU name Blackcomb Whistler
Market Laptop Laptop
Clock speed 680 MHz 725 MHz
Is dual GPU No No
Reference card None None

raw performance

Shading units 960 480
Texture mapping units 48 24
Render output processors 32 8
Compute units 12 6
Pixel rate 21.76 GPixel/s 5.8 GPixel/s
Texture rate 32.6 GTexel/s 17.4 GTexel/s
Floating-point performance 1,305.6 GFLOPS 696 GFLOPS

memory

Radeon HD 6970M  vs
6770M Mac 
Memory clock speed 900 MHz 900 MHz
Effective memory clock speed 3,600 MHz 3,600 MHz
Memory bus 256 bit 128 bit
Memory 1,024 MB 512 MB
Memory type GDDR5 GDDR5
Memory bandwidth 115.2 GB/s 57.6 GB/s

noise and power

TDP 75W 35W

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