Each card is different. You'll need a program like EVGA precision X or MSI Afterburner. Max out the power slider. Slowly raise the core clock by 25 MHz. Then use a program to test the overclock like heaven bench. If it passes the test without crashing keep raising the core clock. If it crashes then lower the core clock by ten and test it again. This will help you find your maximum core clock. Do the same for the memory clock. Good luck!!