What type/model of server is that?
Why did you upgrade to ESXi 6.0 on a server with issues? First PSOD is 5.5.0 2nd is 6.0...
Perform some brief hardware tests and probably check if the cooling system works as expected.
Maybe even some driver is not working correctly as this seems to be a whitebox system. Which mainboard is in use and whuch brand/model of NIC?