Closely trailing ASRock and ECS, Gigabyte began releasing beta BIOS updates for its socket LGA1150 motherboards based on chipsets other than Z87 Express, which let you overclock Core "Haswell" K-series processors. Intel intended Z87 Express to be the only LGA1150 platform that lets you overclock processors, but motherboard vendors found their ways around the limitation, enabling a few overclocking features for motherboards based on other chipsets such as H87 Express, and B85 Express. These BIOS updates are marked beta, and typically feature the version number "FXc," with a change-log entry reading "enables K SKU CPU multiplier." With this BIOS installed, you can overclock K-series processors such as Core i7-4770K and Core i5-4670K, by tinkering with their base-clock multipliers.Many Thanks to DJElectric for the tip.