i find ASUS P8P67 EVO, Gigabyte GA-B150-HD3 they are really cheap and cpu for them is cheap and i have ram for them so is super, but they are good ? someone can tell me ?? i think also about MSI Z270-A PRO, ASRock B250 Pro4 but if i buy it I can not afford for next GPU so it little lame
Well maybe, try to find if it has bios settings for TOLUD set it to lower than 4G or above 4G. B150 chipset will not run more than 4 max out is 5 and it will run only on Biostar TB150 I think.
Maybe try one of these it's all Asrock. I think the used Z170 (MSI, ASUS) would be best low budget mobo if you can't get BTC ones, Z170 can run 6 gpu with some troubles.
http://cryptomining-blog.com/tag/motherboard-for-ethereum-mining/