Hi!
My system based SuperMicro X8DTN+-FLR.
I have 4 system nodes and all was good condition with 4036 QDR switch and MHQH19-XTCs and MHQH29C-XTRs.
I don't use Intel vt-D (Direct-through) on vSphere environment. My vSphere environment is all 5.1.
Good luck...:)