Building a new UrRAID host to replace desktop PC's in my house and i needed two GPU's, and 3 USB controllers. Problem was, none of the mother boards that satisfied my other criteria had enough accessible PCIe slots if GPU's were in the long 16x and 4x slots.

 

The solution:

 

https://www.amazon.com/gp/product/B07N38Y799/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1

 

In the foreground of the photo is a tiny USB 3 card connected with the adaptor in the amazon link.  In the background, the other end of that USB cable is connected to the part that fits into the PCIe slot.  After this shot i was able to reinstall the 5500 GPI which fits perfectly with it's fans and heat syncs extended over the PCIe slot.