Installed vmware esxi on my home R510 last night. Apparently, v6.5 doesn't have NFS datastore connections in the classic client. There's not a free edition of the vsphere client/server either, so I was forced to downgrade to 6.0u3.
There's a builtin web client in 6.5. That's the preferred client now.
I saw mention of that, but I downgraded as I was unable to open the web client on the free license. VMware is really, really pushing people to get a license. That completely sucks because now I'm going to be experimenting on old software.