I have a GTX 1660 graphic card with 3 displayports in a PC. One Oculus Rift S has been connected to first displayport and work fine, but I failed to add second Oculus Rift S connected to second displayport. Oculus application showed second Rift S not connected. Then I tried to add one more GTX 1660 to second Rift S that is still not connected. Is it possible to connect two Oculus Rift S in one PC?