Posted 11 January 2017 - 11:55 PM
Welcome first off to the forum!
It's not officially supported according to some NVIDIA notes I've seen, but evidently works. We have a server with both a K1 and K2, for example. What won't mix are K and M series in the same server, so for example, a K2 and an M10. That's because they use different licensing mechanisms and the drivers conflict with each other.
As far as in the same pool and with different nodes having different GRID hardware, there is currently no support for VM migrations across nodes (currently in XenServer, at least) that are tied to GRID cards, so these would of course fail if you went to a node that didn't have a compatible set of drivers on it. In off-line mode (the VM not running), you should be able to start up a VM on a different server if it can leverage the same type of GRID card.
If you need more info, I know all the right people to ask for details.