We have a 86uh5e display that will not work with four inputs in "Multi Screen" mode. We started with a Matrox C680, 6 DisplayPort video card in a HP Z4 G4 Workstation running windows 10 Enterprise. After limiting the DisplayPort to 1920x1080p, we had three inputs working (two HDMA and the DisplayPort input). The remaining input (HDMI3/DVI) always showed "Not Supported". We added a second video card, GeForce xlr8 GTX 1650, which has two video outputs - HDMI and DVI. We were only able to get two inputs working with both video cards. The fourth input would work with a raspberry pi connected. We also checked the fourth DisplayPort on the Matrox card with a separate monitor, which worked. Matrox support suggested using Active display adapters which we tried and did not make any difference. Any ideas? Thanks.