Long time lurker here and wanted to share my rig that I made.
Motherboard: Asus z270 Killer with two M.2 Key M NGFF to PCI-E 4X Adapter Card to make it work for 8 gpus
risers: EXPLOMOS VER 008S from amazon
PSU: Bitmain 1200w
Frame: homemade. I made it high enough that I can put a regular ATX PSU under it but ended up using the Bitmain one for this.
https://photos.app.[Suspicious link removed]/ZHXxRfGN8rB98iMD3
https://photos.app.[Suspicious link removed]/EIEF2311qPkqPgRe2
https://photos.app.[Suspicious link removed]/it2GLQTCBrfX4wUE2
I'm not a handy man so I was pretty proud of the wood frame I built. It's very study, minimal design, cheap and can be lifted around very easily as the side support bars makes a good handle to carry.