alll risers support 3.0 (x1). well if motherboard support only 2.0, than the riser will do 2.0 as well.
Holy shit that worked!
Above screenshot is from Asus PRIME Z270-A. I have 6 rigs with those mobos, so I'll switch the other 5 to gen3. Ditto on the my 2 MSI Z270-A PRO mobos. Should also work on my 2 X99 based rigs I suppose.
Once I get my Acorns, I'll drop them both in a 7x 1060 first, see how it does, then a 7x 1080Ti rig, to see which show the better increase in terms of $/day.
I realize 2 Acrons will run at 100% all the time on a 7x 1080Ti rig, but it should lift them all by an equal amount, and just partially offload the GPUs, right?
I would go check in your operating sysatem if they are really doing 3.0, because its highly unlikely that you get 3.0 with usb3 cable risers
EDIT: In linux for example this command would show your negotiated pcie speeds.
lspci -vv | grep -E 'LnkCap'