it seems i pre-emptively answered your questions a few minutes ago! im using the very latest BIOS and redfish IPMI firmwareI assume you have tried the A1,B1,C1,D1 config with different DIMMs to rule out a faulty one?
Resetting CMOS would've been my next idea, there are some LRDIMM specific settings which might not have mattered when you used RDIMMs before.
Which BIOS version are you using?
The X10QBi is a nasty diva, I always pray that I don't get and crude VM memory errors when rebooting the machine
P.S. yes, I am absolutely sure none of the new 64GB sticks are faulty. im running on all 24 of them in Ubuntu right now. the problem is just the DIMMC DIMMD thing