Apparently the cross-compatibility and quality are quite variable. PCIe <= gen3 seems easier than gen4, though, and for your needs it sounds like gen3 signal will suffice.
This thread and this one contain a discussion about, and in the latter case an example of, using the ASRock boards’ SlimSAS connectors to connect PCIe devices such as USB controllers. If these connectors are unoccupied in your system, that could perhaps be an option?
Thanks for the info.
I don’t have any slimsas connectors but I have 2 minisas which I think can be converted to 1 slimsas but I plan on using those for storage.
Optionally I could get a pcie to slimsas card but with the card, the cables and a slimsas to female pcie (x3 at the minimum), it gets quite expensive (prob around $500).
and at that point I may as well go with something like this: plus an extension/riser
But you’ve given me a lot to think about, so thank you.
A note*
I read that USB 3.0 runs at about 5Gb which is a little more than pcie 3.0 at 4X (around 4gb)
I realize that no matter the bifurcation method, "splitting the pcie slot " will reduce speeds
But if I got a pcie 3.0 4 way splitter and 4 of those mining riser cards that would be a theoretical 4 way split.
which I cant think of any particular reason for that not working.
maybe even if I got a riser card that has 2 input on it, i could have 2 risers at 5Gb and 1 riser at 10. This would be great as one of my USB cards is going to be used for and Oculus rift.
Would there be any reason in particular why this wouldn’t work?
Is it even possible to do a 4X, 4X, 8X split?