See if their is a bios update.
This is more frequent among DFI motherboards, however it is possible that Intel has a bios error as well.
BTW: For over clockers what boards are you guys using? I'm thinking of getting up to 3.2 ghz on my q6700, Anyone try to over clock the dg33tl using software yet?
Don't even bother trying to OC with the shipped board. You're limited in so many other areas that you'll just end up getting frustrated...