My problem was I was trying to have my cake and eat it too, I wanted to keep playing games with either one card mining and one card playing, or to switch back in forth between gaming and mining; hence, I kept envisioning my 1080's still plugged into the x16 slots. I was trying to figure out how to use the risers with the cards smothering them. Looks like I need to make a decision.
Might I still be able to do this with these?
https://www.amazon.com/EZDIY-FAB-Express-PCIe3-0-Flexible-Extension/dp/B01CEKN5VO/ref=sr_1_3?s=electronics&ie=UTF8&qid=1520695470&sr=1-3&keywords=pcie+x16+riser
My concerns then would be cable length and stability.
Though the more I see, the more it looks like it'll be one or the other...