Celeron D 356 is a devilish overclocker - 5Ghz
 

HKEPC has a whoppa of a chip in there with the new Intel Celeron D 356. It is a 65nm Cedar Mill part and overclocks like crazy. How about 5GHz for a start? It comes with 512kb memory and is clocked at 3.325GHz which makes it, at least on paper as fast as an old Pentium Northwood 4 3.06GHz. At 5GHz, it manages to outclass a 2MB L2 Pentium 4 670 running at 3.8GHz, pretty easily. (Src: TheInq)

Be interested to see how the Sempron 3400+ overclocked for the comparision; GHz doesn't mean much anymore?