Hey, now that you mention it, the Tested Memory List for my Supermicro X9DRI-LN4F+ only lists 64 GB modules in the 1333 mhz section, so I'm not sure that even 1600 will work, but I'm willing to test,
To that end, I think I'll combine all my current 32gb rdimms into one server, and get four 1600...