The Overclocking Knights have set a new overclocking record with the Intel Core i7-4770K retail processor. They overclocked the processor all the way up to 7068.52 MHz using the MSI Z87 XPOWER motherboard, which is MSI’s top of the line overclocking motherboard.

All of the previous i7-4770K records were set with engineering samples, which are not available to normal users.
Source: CPU-Z, HWBOT | News Archive