Hmmm, same PSU I am using RM850.
I find it strange that you have the same issue with both cards, that to me rules out the card.
Did you try the clean driver tool to remove everything before installing a new driver?
Also, as I would do, have you tried ...
I find it strange that you have the same issue with both cards, that to me rules out the card.
Did you try the clean driver tool to remove everything before installing a new driver?
Also, as I would do, have you tried ...