What GPU riser cable do you use?

Hi watercooling experts :)

i like all your builds with vertically mounted GPUs. I tried it 2 years ago with my Radeon VII. It was the time with AMD blackscreens and bad drivers. After removing the riser cable most of the black screens were gone.

Today the waterblock for my Radeon 6900XT arrived and i want to give the vertikal mount a new chance. So my questions are : What riser cable do you use ? Do you use PCIe mode 3 or 4 ? Any problems with blackscreens etc ?

Thx in advance