OK, It was set to auto in the BIOS so that must have been the reason. Now I've got another question...I tried to get to 4.3 GHz on 1.200v since it did 4.2 on 1.195v, but I get a blue screen on startup.
It seems like any voltage I try doesn't want to push the chip past 4.2. Also I have an Asus P8Z77-V LK motherboard, and I've heard it's not the best for overclocking since it has trouble with voltages in extreme overclocks, but 4.3 GHz is not very high. Is there something else I need to set so I can achieve 4.3? By the way, my temps are pretty good. My Antec Hydro 620 keeps it under 65 degrees Celsius during a 12-hour Prime95 test (Which surprised me, because people say the 620 isn't sufficient for a decent overclock.)