Today I was going to add a third card to my computer that already houses 2 cards. The cards are 1xr9 390 sapphire, 1x570 4gb sapphire nitro+ and the one I was adding was a asus strix 570 4gb.
They all work fine if I just put them in one by one or two by two. But when I connect the third one via a riser I get this error on startup. (I don't even get to splash screen.)
I've tried every card in different risers and with different combos. I even wired one via a riser and one directly on the mobo. And that worked fine, but as soon as it's three cards simultaneously it bugs.
Mobo is Asus z170 pro gaming.
Help.