I run 2x Sapphire Tri-X 290Xs at 1100/1625 (6.5ghz), stable and works great. Using the TRIXX app, I use VDDC Offset of 100 and power limit of 15. Don't remember what that translates to in terms of vCore, but from what I saw on the HardOCP overclocking article, it seemed 'mild'. Their 'Sane...