Not done yet, but I'm at 4.6Ghz on 1.30v with water on an MSI P67A-GD65 so far. Strange batch number though it's 3101A103.
Anyhow it's been so long since overclocking, I'm going to spend some time going up little by little. I've heard a few people say the instabilities show up more in games than stress testing like prime95. Spent some quality battlefield time this evening making sure...yep firstname.lastname@example.orgV is good..
Stock intel sink sucks as you would expect. I was hitting 80C at only 3.4Ghz. Now using an old hacked up modified waterblock on a quad rad and overclock to 4.6, I'm hitting upper 50s, lower 60s with 24-25C ambients.
Anyhow, still working on it, but it made it to 4.6 without any extra voltage, just water...