http://www.expreview.com/13251.html
Relax, he hasn't actually found a way to get past the limited BCLK range. But he got a Core i7 2600 to run at 4GHz by upping BCLK slightly and using its highest Turbo Boost multiplier (39x), and turning off all power saving features. I suppose that counts as overclocking, doesn't it?