Sandy Bridge E processors ending in "K" or "X", like this one, have unlocked CPU clock multipliers. That means they are especially well suited for overclocking, as normal processors have the clock speeds much more locked-down.

Intel's Sandy Bridge-E series of Core i7 processors utilize socket 2011. They bring the technology improvements from the mainstream Sandy Bridge series into the enthusiast realm, delivering increased Turbo Boost speeds and higher per-clock performance. Quad-channel DDR3 memory is also supported, allowing for massive amounts of RAM and high memory bandwidth.