Hello im considering building a Vega rig for mining xmr . Can i get some suggestions with an either 4 or 6 card vega 64 build   I want something stable (not counting initial time building setting it up ofcorse) that i do not have to micromanage/troubleshoot every few days/weeks. electricity is around 10-11 $USD cents here in canada

im thinking:
6x Gigabyte Vega 64
Intel Pentium G4400
2x 900W HP Server platinum power supply    @220
32GB thumb drive for hard drive

thats as far as i got so far, need suggestions for motherboard and ram