I use this setup:
Cheap motherboard (12 cards) (107$) https://ru.aliexpress.com/item/B250/32853043621.html?dp=13187920c295676b27dbd528726e4265&af=194949_1697751&cv=47843&afref=&mall_affr=pr3&aff_platform=aaf&cpt=1517588644960&sk=VnYZvQVf&aff_trace_key=a59cc751595649958f08668bc3a0b184-1517588644960-07337-VnYZvQVf&terminal_id=e34519e5ebfc44e0a1d84d74abe5f8df
It seems like cheaper even with cpu and memory and risers and it has 12slots instead of 8...


Power supply 1800W (149$) i've bought 4 of them for 138 (1x powers 8x 1060, 2x powers 8x 1080ti, noisy, no spped regulator on fan): $https://ru.aliexpress.com/item/ETH-ZCASH-MINER-Gold-POWER-1300W-kenwei-1300W-BTC-power-supply-for-R9-380-RX-470/32779122989.html?dp=13187920c295676b27dbd528726e4265&af=194949_1697751&cv=47843&afref=&mall_affr=pr3&aff_platform=aaf&cpt=1517588644960&sk=VnYZvQVf&aff_trace_key=a59cc751595649958f08668bc3a0b184-1517588644960-07337-VnYZvQVf&terminal_id=e34519e5ebfc44e0a1d84d74abe5f8df

All system is running hiveos from cheapest 8gb flash stick found on aliexpress.