I see and have owned a bunch of x16 risers that are fat ribbon cables. Is there something that bundles the fibers together so that it's a cable instead of a ribbon cable? I would like to thread it ...

You might have heard the term “bifurcation” if you’ve been around PCIe, especially in mining or PC tinkering communities. This is splitting a PCIe slot into multiple PCIe links, and as you can imagine ...