If we're to believe the latest whispers from rumor sites, Intel will add a Core 2 Duo E8600 to its range of processors on August 10. Supposedly, the chip will cost $266 and feature a pair of 45nm Penryn cores clocked at 3.33GHz. Notorious Taiwanese overclocker Coolaler grabbed an E8600 ahead of the launch, and he's been able to push it a tad higher than that.
Going by the screenshots in the associated Coolaler.com news post, the overclocker's Core 2 Duo E8600 engineering sample successfully hit a staggering 6.25GHz—almost twice its stock clock speed. Achieving that phenomenal overclock involved a combination of liquid nitrogen, a 1.936V core voltage, and a DFI LanParty UT P35-T2R motherboard with its front-side bus cranked up to 625.4MHz (that's an "effective" 2501MHz, considering the quad-pumped nature of Intel's front-side bus).
When paired with 4GB of 1251MHz DDR2 memory, Coolaler apparently completed a 19-iteration Super PI 1M run in just under 7.3 seconds. Impressive, to say the least, although liquid nitrogen isn't exactly an everyday PC cooling solution.