I thiink on Z77 I had max Pci e 1.1 with Celeron and hd 6870. But on Z170 all RX are runing on 3.0 and 006 ver . eitherway, 1.0 is more than enough for mining cards. For Acron, not sure, didnt pay attention.
I have 4 or 5 z170 boards from biostar
https://www.amazon.com/Biostar-RACING-Z170GT7-Intel-Motherboard/dp/B06XDKHN1SI think that these boards with the nest x2g and acorn 215+ will be true beasts
