Maybe so for the K SKUs but not for the non-K SKUs, where it is much more important because you will be stuck at 102.99 BCLK without it. On my G7400 and X7e I can select MCUs in the drop-down but it does nothing, on next boot the little text field next to the drop-down still shows the new version (not the selected one) and BCLK is still stuck below 103.