How odd, Cedar Mill relates to the Pentium D/5 series. This chip is what you have I think:
http://www.newegg.com/Product/Product.asp?Item=N82E16819112230
Ok MY Celeron D 3.33 GHZ O got all the way to 4.5GHZ with the temp at 45C or 108F is that stable and at a good temp.
LISTEN IT IS A CEDAR MILL, there is a difference in D355 and D356, the 55 is a Prescott, the 56 is a CEDAR MILL