Where are you guys buying your motherboards? I can't seem to find anything in stock from the major online retailers. I'm looking for a 6 slot motherboard for rx 470's. The same goes for the GPU's. Do you just wait on a waiting list for stock to replenish or do you settle for a different model?

My first choice is clearly the ASRock H81 Pro BTC.

I'm looking at the ASRock AB350 Pro4 AM4 ATX AMD motherboard as an alternative to the sold out one, but I can't seem to find any confirmation that it supports 6 cards on linux.

Any advice?