[stansdds]

I have the Core duo E6850 3.0 Ghz but have never tried to overclock it....do you need extra cooling??

It's highly advisable. I overclocked my E6850 to 3.6 Ghz, it runs well below maximum allowable temps. My cooler is a Xigmatek S-1283. Not the greatest cooler in the world, but not the worst, price was good and it works quite well unless you are going for extreme overclocking. I also use an Antec 900 case, stock fans with the front two running as intakes at medium speeds, the top and rear fans as exhaust running at low speed.