Pretty much any server hardware will work fine, personally I'm running a Tyan S7050 motherboard with a couple of E5-2667 V2 CPU's and 64gb of samsung ddr 3 ecc ram a couple of ssd's in (fake) raid 0 and 2 AMD gpu's. Unless you're pretty paranoid I wouldn't go with really old and slow hardware. If you have a decent amount of ddr4 I would look for an AMD Ryzen.
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