so i got a second r9 290 yesterday and a corsair hx850i psu but when both cards are in the system there is a high pitch whine and its driving me crazy, both cards work fine on the own in a seperate system and the psu has a faint whine but its hard to hear it, i have put my system back to one card and old psu and its fine so it has to be the psu right? i dont know what to try next! help me guys !!