I guess my E6600 @3.7GHZ stable since I bought the board (about a month ago) is not that bad after all I read.

But I am sure I could go higher with a better CPU since this is the limit for it no matter what. It did 3.6GHZ with 1.45v on air (nothing more on air) but needs 1.625 to do 3.7ghz on water and anything above (3.75Ghz did not test in between) is not stable in orthos no matter what. So that is it for me till the next upgrade to a Quad core and probably a new motherboard as well if it does not overclock well with the quad. But this will be in about a year or min 8 months depending on quad prices and games that could use it.