Soldato
Yes 3000 is the sweet spot!
Above 3000 even in Crosshair is fiddly, 3200 seems max, whereas all the other mainboards are stuck at 2400-2666 so far, though we are yet to try Taichi and Carbon, but the MSI 370 SLI and Asus Prime did not want to go much beyond 2400MHz!
3600MHz is absolute flat out NO on any mainboard at present!
Thanks Gibbo, seems a good price so will order some in readiness!