Sorry Npolite2,  I missed the comment you said that you tested each in A1. When you did this was all the other dimms out of the server when you tested each in A1? If so then It does look like you may have some bad dimms shipped to you. That is the troubleshooting method for testing dimms at the individual level. 
Hi All, I purchased 4 Mushkin 16GB memory [URL] modules from Newegg. Putting 1 16GB memory into the server A1 slot worked and the system booted up. I then placed another stick in A2, one in B1 and B2. This is all the same memory but from two orders.   I booted in and the BIOS threw an unsupported configuration on A2,B1 and B2. I then took each stick A2, B1 and B2 and tried to boot the server with just the one stick in A1 and could not boot the server. Do I have bad luck and just have 3 bad sticks? The server is on bios 6.3.0 if that helps. Thanks
16GB memory R610 -- Bad luck?