The seventh generation of Radeon HD graphics cards hit the market back in December of 2011 and while gamers were able to experience new levels of power just in time for Christmas mobile users were left behind with their old sixth generation Radeon graphics chips. Until now.
AMD is finally ready to remedy the situation with the launch of the new seventh generation Radeon mobile chips – the Radeon HD 7700M, 7800M and 7900M.
Just like its desktop predecessors the novelties are built on the 28 nm GCN architecture and they do not differ that much compared to its desktop counterparts with slight differences here and there. For example while the Radeon HD 7900M resembles the Radeon HD 7870 GPU it runs at just 850 MHz compared to 1 GHz for the HD 7870 chip. Spec-wise the HD 7970M packs 1280 GCN stream processors, 80 TMUs, 32 ROPs, and 2 GB GDDR5 memory with a 256-bit memory interface. Its core is clocked at 850 MHz, with 1200 MHz (4.8 GHz GDDR5 effective) memory clock speed, amounting to 153.6 GB/s memory bandwidth. The HD 7800M is clocked at 800 MHz, with 1000 MHz (4 GHz GDDR5 effective) memory clock speed, amounting to 64 GB/s memory bandwidth. It features 640 GCN stream processors, 40 TMUs, 16 ROPs, and 2 GB GDDR5 memory with a 128-bit memory interface. The HD 7700M is clocked at 675 MHz, with 1000 MHz (4 GHz GDDR5 effective) memory clock speed, amounting to 64 GB/s memory bandwidth. It features 512 GCN stream processors, 32 TMUs, 16 ROPs, and 2 GB GDDR5 memory with a 128-bit memory interface. The HD 7900M and HD 7800M have PCI-E 3.0 support, while the HD 7700M only offers PCI-E 2.0 support.
As to the performance AMD says that the new HD 7900M chip is 44% faster than the HD 6990M while also besting GeForce GTX 675M and Radeon HD 6990M in tessellation tests.
The new AMD mobile graphics chips will be on the market shortly with the first ones expected in the Dell Alienware M17X where the base model starts at 1699 USD.
Source: Tom’s Hardware