some old MSI Z77A-G43, Asus PRIME Z270-P (plus 2 biostar mATX motherboards with 2-3 pci-e on each), 2x ASUS STRIX 1080 A8G, 2x Gigabyte Extreme Gaming GTX 1080, 1x MSI GTX 1080 TI SEA HAWK X, 4x Gigabyte GTX 1080 Ti Aorus, 6 x ASUS STRIX GTX 1080 TI O11G

PSUS: Corsair AX860i, RM750x, 3 x RM 850i, Gigabyt B700H(80+ bronze isn't good)


CPU: Celeron G530(in old biostar baseboards), Celeron G3930 (in asus prime)

The cheapest HDDs(WD Caviar Blue 250 GB) and RAM