I have two HP DL 380 G6 servers in my home lab for VMware. I have had zero issues with these servers from ESX5 -> ESX5.5 -> ESX6.0.
However, trying to install ESXi 6.5 on these servers I have run into nothing but problems. The USB flash drives that I was using to run my install were not detected by the ESXi 6.5 installer. It also failed to install to a local hard drive installed on the system.
However, as a long shot I went out and bought SanDisk 8GB SD Cards for the hosts and ESXi 6.5 was able to install on to those and I received a notice that the processors may not be supported in the next version (sad face).
Also, I was fighting the ILO’s on these things but version 2.29 did help a little bit.. still trying to get the right version of java loaded to make these things happy.