VR-Zone has stumbled upon a presentation slide showing what looks like AMD's mobile GPU roadmap for the next two years. The roadmap comes courtesy of Turkish site DonanimHaber and includes details on four new GPUs purportedly slated to be built using 28-nano fabrication tech. AMD's current lineup of Radeon HD 6000M mobile GPUs includes Blackcomb, Whistler, and Seymour silicon built with 40-nm process technology.
What may be called the Radeon HD 7000M series boasts four GPUs dubbed Thames, Chelsea, Heathrow, and Wimbledon. Thames, the lowest-end offering, promises double the performance of the Seymour GPU that anchors the current Radeon HD 6400M and 6300M series. Some of that additional performance can likely be attributed to Thames' 128-bit memory interface, which is twice what you get with Seymour.
Thames is slated to slot into a 15-25W thermal envelope. Notebooks with greater thermal headroom may opt for Chelsea, a 20-30W part that looks poised to replace the Radeon 6500M and 6700M. Like Thames, Chelsea has a 128-bit memory interface. Interestingly, the Heathrow GPU listed above it is shown with 128- and 192-bit memory interfaces. We'll probably see that GPU roll out in a couple of different memory configurations, although it's a little odd to see that kind of segmentation with notebook GPUs.
The slide says that Heathrow will have a thermal envelope of at least 35W, and that it will be joined by an even faster Wimbledon GPU with a 256-bit memory interface. Wimbledon seems likely to supplant the Blackcomb GPU that underpins the Radeon DH 6900M, although it's not due until the second half of 2012. The rest of AMD's forthcoming 28-nm mobile GPUs appear to be scheduled for production in the fourth quarter of this year.
What's interesting about this mobile roadmap is that the new GPUs have moved upmarket. Where Seymour is listed as a "value/mainstream" part, its Thames replacement is filed under "mainstream/performance," leaving no new hotness for the value segment. AMD expects those customers to be using the integrated graphics processors built into its Fusion APUs. According to the slide, the Radeon maker will continue to supply "legacy/refresh" products to notebook makers looking for cheap discrete GPUs.