I might be the oddity, but I have used i225 and i226 cards with NO trouble. Even Sabrent USB to 2.5gbe have worked great for me.
I will say though, I wish I would have skipped the 2.5gbe and went straight to fiber.
I am now in the process of migrating to all 10g fiber. It runs cooler, switches and NICs are abundant and cheap and it just works. And if I would have skipped the 2.5gbe entirely, It would have been similar in price. If not cheaper...
-Jay
ESXi ???
Not conventional KVM. But, think about it... Screen View/Control, Power Control, and more.