What cpu cooler are you using?
while I can't speak for his cooler, I have read that the 3570k easily gets to the 4.7-4.8 mark without major overheat problems. The issues come when you try to max it above 5.
It seems that critics of the ivy bridge think the CPUs should be able to far outdo their sandy bridge equivalents in OC, especially for the extra money one pays for ivy bridge. Is that the way you see it?
According to intel, take it for what it's worth, IB was not meant to go much further than what SB achieves as far as frequency. They say that the architecture of IB equates to faster processing at equivalent frequencies. That being said, I think the architectures of IB also lead to running a little hotter. The info I am looking at that was from when IB first came out indicates that intel doesn't advise OC past 4.8 or voltages over 1.35. Lots of people ramp their voltages up to 1.5 on SB. What kind of voltages are you pushing on your SB?
Discussion aside, this is my first build. My plan is to use this for gaming and surfing the web practically. I would like to do a pretty safe OC to about 4.5gHz with a decent air cooler, 2 stock fans, maybe another fan. Possibly add a second GPU later on. If I want to get into a heavy OC, SLI, true liquid cooling I know that I am gonna to need a completely different setup for that.