When ocing many simply rush in rasing the voltage settings without realizing that some memory will run hot if that is kept constant. It's one thing to very briefly see where hardwares will go before losing integrity and then bringing them down to a stable setting.
 
 For constant use keeping the voltages reasonable while bringing up the memory clock on the board(fsb) will see better results. The key to success with any ocing is finding that best stable condition. A small jump by .1v steps is often done to see a gain while gaming and even that was only a few upto 2.6 with some brief increase to 2.7v and not higher.