"Sea Islands" Radeon HD 8800-Series Specs Revealed
AMD's Southern Islands GPU line-up was completed 6 months ago with the launch of the Pitcairn based Radeon HD 7800 series graphics cards. NVidia recently launched the GeForce GTX 650 and GTX 660, filling the line-up of GPU cores, and they set to launch a GTX 650 Ti to plug a large gap in their mid-range models. Now is the time we can start expecting leaks and rumors about next generation products. A contributor at read2ch.com has obliged with specs for the Sea Islands Radeon HD 8800 series graphics cards, using the Oland die, that will have 3.4 million transistors on a die sized between 270 - 280 mm2.
Sea Islands GPUs will use the Second Generation Graphics Core Next (GCN2) architecture, and will be built on the same 28 nm process. Comparing Oland based GPUs with their Pitcairn counterparts, we see a performance improvement of between 54% and 75%. The source says the performance of Radeon HD 8870 is comparable to GeForce GTX 680, 30% faster than the GTX 660 Ti. Radeon HD 8850 is said to have similar performance to GTX 670, 35% faster than GTX 660. Memory bandwidth on both cards is 192 GB/s, 25% faster than Pitcairn, so it seems reasonable to assume it has a 256-bit bus and runs at 6 GHz (effective).
Radeon HD 8870 has a TDP of 160W, 9% lower than the 175W of the Radeon HD 7870, and the projected launch price will be 20% cheaper:
Radeon HD 8850 had TDP of 130W, identical to HD 7850, and costs 20% less. All this adds up to a very favorable performance/power/$ ratio improvement:
The source also mentions January 2013, which possibly is an expected launch window.
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