one bad side for using riser is that if you accidentally plugged in wrong positions, the PCIEx1 cable riser can be easily plugged to pci-E x 16 slot of the mainboard even if not in correct positions and may cause short circuits, but my bad experience with risers is that I use 4pin molex psu cable powering up 3 Risers wit GPU Rx480 8GB, and ended up burning the cable connected to PSU.