AMD adds GCN to Radeon HD 7000M line-up

Earlier this week, AMD added three new SKUs to it's mobile graphics line-up. The Radeon HD 7900M series, currently comprising solely of the HD 7970M, is based on Pitcairn, the HD 7800 Series desktop SKU. Cape Verde has been reused to create both the Radeon HD 7800M and the Radeon HD 7700M series, making their new GCN architecture available to mobile devices.

Radeon HD 7970M, codename "Wimbledon", has the same specifications as Radeon HD 7870 on the desktop, except that it has a 15% lower core clock speed. The 850 MHz clock speed is still enough to provide 2.176 TFLOPS of single-precision compute power, with 136 GFLOPS double-precision. The 256-bit memory interface and clock speed of 1200 MHz supplies a memory bandwidth of 153.6 GB/s.

	Radeon HD 7970M	Radeon HD 7870M	Radeon HD 7850M	Radeon HD 7770M	Radeon HD 7750M
Compute Units	20	10	10	8	8
Stream Processors	1280	640	640	512	512
Graphics Clock	850 MHz	800 MHz	675 MHz	675 MHz	575 MHz
Texture Units	80	40	40	32	32
Color ROPs	32	16	16	16	16
Z/Stencil ROPs	128	64	64	64	64
Memory Interface	256-bit GDDR5	128-bit GDDR5	128-bit GDDR5	128-bit GDDR5	128-bit GDDR5
Memory	2 GB	2 GB	2 GB	2 GB	2 GB
Memory Clock	1200 MHz	1000 MHz	1000 MHz	1000 MHz	1000 MHz
Memory Bandwidth	153.6 GB/s	64 GB/s	64 GB/s	64 GB/s	64 GB/s
Single-Precision Compute Power	2176 GFLOPS	1024 GFLOPS	864 GFLOPS	691 GFLOPS	589 GFLOPS
Double-Precision Compute Power	136 GFLOPS	64 GFLOPS	54 GFLOPS	43.2 GFLOPS	36.8 GFLOPS

Radeon HD 7800M Series, codename "Heathrow", consists of two versions of Cape Verde XT, downclocked to two different speeds. HD 7870M has it's clock speed reduced by 20%, to 800 MHz, while HD 7850M has it farther reduced to 675 MHz, almost one third lower than the desktop SKU.

The third series, HD 7700M (codename "Chelsea"), is based on Cape Verde Pro, again consisting of two separate products which differ only in the graphics clock speed. HD 7770M has a clock speed of 675 MHz, and that is lowered to 575 MHz for HD 7750M. Cape Verde Pro (ie HD 7750) runs at 800 MHz.

All the new SKUs use the Graphics Core Next architecture, built using a 28nm process, so users will benefit from the same features introduced on recent desktop SKUs.