Are there X99 ATX mobos with four evenly-spaced PCI-E x16 slots? (Even if they are electrically x8?)
I own what I consider to be a magnificent (Edit: AMD 6-core, Thuban) workstation board of the time, an MSI 790X-something, that has four evenly-spaced PCI-E x16 slots, that can run in x16/x16 or x8/x8/x8/x8. I have used it for distributed-computing, with three or four video cards (single-slot, in my case), power-supply permitting.
I would like to do something like that again, build a nice "crunch rig", maybe with 4x Polaris 10 / RX 480 cards, if they are really $200. (Like the list price of my single-slot HD4850 cards before them.)
Would such a mobo, if it exists, work in x8/x8/x8/x8 mode, with a 6800K CPU? Or would you need a 6850K or whatever the one with more PCI-E lanes? I'm pretty budget-conscious, so if this isn't going to work with the cheaper chips, I probably won't do it.
Edit: This one looks pretty nice:
http://www.newegg.com/Product/Product.aspx?Item=N82E16813128885