Thanks Al: trouble is I have been trying to get MSI to answer this one for a couple of days. I am building a replicate of my main workstation, which I built a couple of years ago when the X99A workstation came out and which used the Intel Core i7 processor extreme addition that went into the LGA2011-3 socket. My understanding is that the -3 socket is quite different from the -v3 and the -v4. However, the manufacturer sent me a -v4 and when questioned the supplier said they cannot confirm it will work in the motherboard - very frustrating. I guess I'll send it back and look for the -3. Would like to use the -v4 as I have it in hand and can get on with life if I knew it would work. It may simply need a BIOS upgrade to work but cannot get information on that either.
Thanks for your effort.
"It is better to see a thing once
than read about it a thousand times."