Almost all of these are designed for servers and have few if no PCIe slots. There's the Intel Skulltrail motherboard for S771 (not the same as S775) which has dual socket and quad-PCIe iirc. But the only processors for it are £700+ each.Iv currently saved up £1200 and i wish to buy a dual cpu motherboard. Where can i buy these? Are they compatible with core i7s?