Unfortunately, most manufacturers currently produce only motherboards with close end at their pcie x1 slots. There are many reasons why people want to have free end slots. And I am surprised why close end slots are still placed.
I have a usual motherboard, and I have an extension card (a usb controller) that is x4 size. My motherboard has three pcie x16 size slots, but I cannot use one of them for usb controller pcie x4 card: the pcie16_1 is for GPU, the pcie16_2 is free, but has improper iommu isolation (it is grouped with pciex16_1 slot), and pcie16_3 is for second GPU.
I want to mount my usb controller to one of the pcie x1 slots. It fits there, and so I do not need to use riser. The only problem is the close end of the slot.
I wish to convert the pcie x1 slots to free edge. Are there reliable safe ways to do it? I do not want to risk damaging my motherboard. Does some tools exist for this task (probably pcie edge cutters/scissors)?