Any lower vCore and I get fatal errors in P95, and then crash if I don't stop the test in time. I bumped up the voltage 1 notch at a time till it could pass P95, IBT, and AIDA64. I'm pretty sure that's as low as I can go. As I said, I didn't get a very good chip. It needs over 1.2v for stock. 4.5Ghz is where It hits a wall, and I really needed a lot of vCore for that extra 200Mhz. My 3570k, on the other hand, I would say is above average, but I plan to sell it, not delid it.