Question about Intel Core i7 4790K BOX

"Unlocked" designated as a "K" model means that the so-called multiplier is not locked on these processors. This means that these models can be overclocked via BIOS or software. With the "non K" models, the multiplier cannot be used for overclocking, as it cannot be adjusted/changed. However, it is also possible to overclock the non K version on some boards via BCLK. Clock frequency results from [multiplier x BCLK] ,

ok Thanks for the quick and informative answer ^^