Yes, it seems the core itself is really whats limits the 560's. I have voltage to spare (stock voltage of 1.012v), very good temps and cooling everywhere on my Gigabyte 560 SOC and I can barely get anything over stock stable. Maybe 1010-1015 on the core. I've tried all the way up to 1.1v and I dont think that really helps get 1015Mhz stable.