It sounds like you are trying to squeeze out some extra performance from your system.  Unfortunately, both of turbo boost (2.0) and turbo boost max (3.0) are not overclockable.  On the bright side, you have a high-end Skylake processor which is still good to handle today applications. On the concern regarding memory, whenever you mix your ram, the system default to the lowest clock.  Consider yourself lucky as many others having problem when mixing brands and clocks.
Hi Experts! I have a workstation Dell7710 Xeon , I am wondering where i can find xmp  mode . I tried F2 to enter bios but not know where this option available?
DELL 7710 where to find XMP BIOS