I've ordered an rx580 and rma'd it. for both cards every Time windows goes into sleep mode automatically, there is artifacting on one of my monitors. The monitor that has artifacting is an asus 144hz VG248 connected by dual link dvi. My other monitor, connected by HDMI does not experience any of this artifacting. It seems that changing the refresh rate of the monitor to 60hz and 144hz again fixes the artifacting until windows is put on sleep mode again.