and did you try to check mobo spec how is it with this slot? Cos primary x16 full speed slot for graphic cards is that upper1. This1 is for those who want to run two cards etc and may be shared with something or may be only 8x.
i still believe it is possible to rewire those cables and mount the graphic card to the upper slot but unfortunelly iam too far to show you the proof 😀 its some professional deformation in my case propably. cos i cant live without clean look inside the case. and its hard to accept the truth that others arent like me 😀