There is a fair bit of cross compatibility between socket 2011 chips but it's not perfect, it wasn't uncommon to see things that shipped with E5V1 chips not receive the requisite firmware upgrade to take E5V2 chips although there were plenty of systems that did, something similar happened with V3 and V4, it's also important to note that LGA 2011 and LGA 2011-3 are not electrically compatible so boards are either V1 and V2 or V3 and V4, I actually have a couple of boards that I know work with V2 Zions that would probably be fun for some overclocking but I don't have the time and patience to play with them anymore, they are the super micro x9 DAX - HFT boards they came with a unlocked FSB adjustments and the ability to manually set the memory speed which was not at all, I guess they were built for day trading and stock exchanges were being able to get every single clock cycle out was important my e5-2667 v2 submissions are all using one of those boards and honestly the only reason I'm moving away from it is because I got the system I'm putting the 2697 before in for a steel on a government auction otherwise I still have piles of DDR3 ECC some intended for overclocking even just sitting there
@neurotix I took a minute to look up the Rampage IV Formula, it's standard LGA 2011(gen 2 and gen 3 i7's and V1/V2 Xeon E5) If I was going to pick a xeon to throw in it I'd probably grab the E5-1680 v2 it's supposed to have an unlocked multiplier where the E5-26xx chips tend to be locked (although some boards like the X9DAX-HFT let you tinker with the bclk and lock them to all core turbo)