However, on the R9 290, only the DisplayPort can achieve 144 Hz. I figure no big deal, I got two of them for a reason! I'll plug one monitor on one GPU's DisplayPort, and the other monitor on the other GPU's DisplayPort... Except that doesn't seem to work.
In fact, nothing seems to work when I try ports from different cards. It seems both monitors need to be plugged in the same card to display anything (1 DisplayPort, 1 HDMI works... but the HDMI is locked at 60 Hz).
Help? How do I get this setup to work (one monitor plugged in each GPU's displayport)?