The site reveals the chip has a 3.0GHz base frequency, 3.4GHz all-core Boost, and up to 4.0GHz Precision Boost. At stock clockspeed, the chip is able to achieve 6243 points in Cinebench, which climbs to an impressive 6399 when modestly overclocked. Interestingly, an overclock to 4.2GHz actually reduces the performance, presumably due to thermal throttling (it's a 250W TDP chip after all).
Via: VideoCardz