Core2Duos are very sweet and lets hope you don't have one from a bad batch that doesn't overclock so well.
Well it's up and running good so far. I had a bad PSU wire that was causing the HDD to not be recognised but got that worked around. And then it took ALL DAY LONG to format the 500G HDD... Now it waits for me to tidy up the wires in the case and then I have to get it connected to the internet to get it all updated.