An overclocker from Taiwan by the name of HiCookie has overclocked Intel Core i7 3770K E1 (Ivy Bridge) past 7 GHz. He used Gigabyte GA-Z77X-UD3H motherboard, Corsair memory, Corsair AX 1200 power supply and of course liquid nitrogen to achieve this. 3 cores were disabled while HT was enabled, FSB was 111.63 MHz, 63x multiplier was used and the core voltage was a whopping 1.956V. Before this, the record was held by nkdfactory from Japan who achieved the highest frequency of 6931.1 MHz.
CPU-Z Certification: http://valid.canardpc.com/show_oc.php?id=2386564