It is very simple, every card is different so you will have to test yourself ! Download MSI afterburner and do not touch voltage, just up the core clock by +25 at a time, testing each time with 3dmark ( Firestrike ) until you finally get artifacts / crashes, then back it down a bit, you have now reached your max core clock without voiding warranty or adding voltage, Do the same for memory after you find your max core speed.