We currently have ESXi on a Dell R710 running 4.1 on local storage (a local RAID volume). Trying to upgrade to 5.0 esxi, by just booting from 5.0 installed on a flash drive. During the load, we're getting a purple screen of death, with something about a "Motherboard LINT1" hardware error. At the same time, the status screen on the R710 turns to orange, and displays "E171F PCIe Fatal Error".
The R710 has a two port PCIe card, and I believe the RAID controller is also PCIe.
If i pull the power, and then restart the server to the 4.1 installed on local storage, then everything works great.
At the recommendation of several posts I found online, I also tried disabling C1E and C-States in the BIOS, but having the same issue.