Sapphire, will apparently have a few HD7950 models, and among them will be a slightly more affordable single-fan model which is in the works. This model likely sticks to AMD reference clock speeds of 800 MHz core, 1250 MHz (5.00 GHz GDDR5 effective) out of the box.
The single-fan HD 7950 appears to have a blue-colored PCB that is likely to be AMD's cost-effective reference design. The cooler appears to have a compact heatsink that is cooled by a single central fan. Display outputs include two mini-DisplayPort, and one each of HDMI and DVI. We're also hearing from the source that 900 MHz core with unchanged (1250/5000 MHz) memory will be the maximum factory-OC permitted by AMD to AIB partners. That is not to say that the HD 7950's OC potential beyond that will be limited in any way.