There is a German Hardware Forum (not related to HP) which did alot of testing with the MicroServer and different combinations of CPU's, etc. but they also only list the V2 version of that CPU so I would recommend to either use that or any other they list:
Another website with tested CPU's (not tested by HPE!): http://homeservershow.com/forums/index.php?/topic/5639-proliant-microserver-gen8-links/#entry62204
But still better ask in the HPE Forum for a (officially) supported solution.