Leaked AMD slides reveal the company plans to introduce the Cayman GPUs in late November, while the dual-GPU Antilles card is slated for December.
The Radeon HD 6970 (Cayman XT) uses a 10-layer PCB and a cooling solution with a radial (blower) fansink. It has 1GB GDDR5 rated at 6Gbps, max TDP is under 300W and the card has one 6-pin plus a 8-pin power connector. The Radeon HD 6950 (Cayman PRO) has a 8-layer (channel) and 10-layer (MBA) version, with radial (blower) or axial fansink, respectively. This model features 1GB of 5Gbps GDDR5, a TDP of under 225W and two 6-pin power connectors. Both cards have two DVI ports, HDMI and two Mini DisplayPort connectors.
While the Radeon HD 6800 (Barts) series is slated as a GeForce GTX 460 competitor, the Cayman (Radeon HD 6900) should be faster than NVIDIA's GeForce GTX 470/480 cards, and the dual-GPU Antilles (Radeon HD 6990?) should become the performance king.