Hi,
I finally upgrade my rig with x370 carbon and 4 Vega 56 and add 2 Vega 64.
I struggle a bit to get it working. Now every card are up in windows but I managed to get it working only with 5 Vega.
Indeed, the Vega which is on first pcie x16 port getting freezing the computer when I compute with it. And this is a new Vega 64 which I bought.

What do you think? IS it the new Vega 64 that is break or this is the fact to run on the pcie x16?
(I can still return the card and get refund, and I don't have an extra riser to try..)