Not really sure how PCIE works. I have a GTX 1070 on PCIE on my new build. I am running a little shy of USB ports. I want to get a 4 port USB (Includes 1 SATA as well) card. The one I found is PCIE. Will adding this to a free PCIE slot slow down/effect the video card performance? Just wondering since I know if you add an addition video card, it goes from 16x to 8x, but not sure if that is the same logic for addon cards etc. Thanks