iam planing soon to put 6 or 7 card so

i know we search for more slots pcie x16 and x1  as we can but it Connecting all this cards is do a problems in Connecting and hashrate


so can you advies me with best motherbord based in you
experience

MSI Z270 Gaming Plus

MSI Z270-A Pro

Asus Prime Z270-A

 Asrock H81 pro btc R2



i hope to get something cheap and done the jop