I have two EVGA GTX 1070 TI FWT's that I would like to move to a GPU rendering server. When these cards are plugged into a workstation's PCI-E 16X slot they work just fine. When I move them to a PCI-E 1X to 16X riser card, they seem to not start up. The lights come on and the fans spin maybe 5 revolutions then stop. They then turn like this (5 revs) every few seconds. The card is not found by Windows 10. I have tried both cards and both do the same thing in this scenario. I am positive that this is an issue with this particular model of card because I plugged 2 EVGA GTX 1080 TI's as well as 2 EVGA RTX 2070's into this same riser and all four work just fine. It is only the 1070TI's that do this. Finally, when I put the 1070TI's back into a 16X slot in the same computer, they work just fine.