Overclock in small amounts 10-15 core clock, and 20-25 memory clock. I usually start with core clock. While running Msi Kombustor or another stress test increase the amounts every 1:30-2 MIN until it starts artifacting and clock it back from there. Do the same to the memory once the core clock is stable. You may need to adjust your fan curve as well. After about 15 min your temperatures should stabilize. You may need to clock back more later if it begins artifacting or shuts down a game. Check your max tdp before you start.