Zahix wroteThere is a thing I don't really understand. the relation between CPU speed and RAM speed like in XMP profile or normal RAM OC.
My mobo is syncing speeds without letting me change the cpu speed.
Have you tried entering the XMP profile settings manually so that you are able to change RAM and CPU multipliers separately?
The base clock on LGA1155 platforms is fixed at 100MHz. RAM settings change only the RAM multiplier and timing, supposedly. They do not impact the CPU multiplier, which is unlocked on the K-series CPUs.