Yes Barts, and not the full-fledged Cayman architecture of the desktop HD 6990 GPU. Specifications of the HD 6990M GPU include a core clock speed of 715MHz, 2GB of GDDR5 RAM at 3.6GHz memory clock speed, a 256-bit bus with a bandwidth of 115.2GB/s, 32 ROPs, 56 texture units, and 1120 stream processors. The core clock of the card can be overclocked up to 740Mhz. The most noticeable difference between the GTX 580M and HD 6990M, apart from CUDA and PhysX, will have to be the lack of a switchable graphics solution like Nvidia Optimus for the AMD Radeon HD 6990M. This could have a serious impact on battery life, figures of which were notably omitted from the introductory announcement.
The AMD Radeon HD 6990M is already out in markets, starting with gaming laptops like the Alienware M18x (seen below), which offers it in single of CrossFire configurations.
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