To even attempt to satisfy the data demands of a pair of 6990 Cross-Fire with a SINGLE physical CPU, you really do need a X58 motherboard and a Gulftown Corei7 990x processor, or maybe a Corei7 970 heavily overclocked. That socket spacing is becoming more common with high-end Sandy-Bridge motherboards, but functionality may still may be constrained by X8 PCIe data-paths at the primary pair of X16 connectors. Very few current Crossfire/SLI-compatible motherboards have triple-slot (or more) spaces between the two PCIe X16 connectors while simultaneously also having genuine X16 data-paths to both connectors. In the case of a pair of 6990 (or a pair of nVidia's upcoming dual-GPU card), a minimum one-slot air-space between cards becomes MANDATORY, unless custom water or cryo cooling is installed. (Obviously, one must not plug any other card into any motherboard socket present in this slot) This socket-spacing allows a one-slot clear air-space for the "rear" card's intake fan to "breathe". However, if one is even contemplating Crossfire or SLI then a triple-slot space between the PCIe X16 SOCKETS for a pair of high-power 2-slot-cooler graphics cards with "open-fan" cooling (like the 6990) is recommended to avoid one card being fried by lack of air. kilkennycat - Tuesday, Malink Triple-slot coolers.
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