It seems the upcoming Core 2 Duo E8600 will offer lots of overclocking potential. Techpowerup spotted on Chinese hardware site Coolaler that someone managed to overclock a 45nm Core 2 Duo E8600 engineering sample from 3.3GHz to 6146.9MHz with liquid nitrogen cooling.
Coupled with a DFI LP UT P35 motherboard, 4GB of DDR2 memory, single Radeon HD 4870 card, and liquid nitrogen (LN) cooling the E8600 CPU was able to reach 6146.9MHz (614x10). That compared to its default speed of 3.33GHz (333x10), and we might have a new dual core overclocking winner. According to the information available on the Net, when released the E8600 will cost somewhere between $266 and $299.