Soldato
One thing to keep in mind Matt when you go X99 (I think you said you were, maybe when Freesync is out do a big upgrade?), is to get a motherboard with the same PCI-e spacing options. Unless you have a board with a PCI-e where the RIVE's black slot is it could mean that at least 2 of the cards will be right next to each other, which I can't imagine will help with the temps. Think Asus have a couple of £300 boards that will do it though.