I wanted to build a rig with with Ryzen 5 1600 as the CPU mines cryptonote (XMR) at around 350H/s. ASRock AB350 with 6 PCIe looked to me a good option for the price, but I can't run more than two GPUs. Worse, when one M.2 SSD is installed, only one GPU works. Anyone tried this motherboard?
That is exactly what i did except I used a ssd. Everything works fine with 6 gpu. The initial set up is tedious though you need to add card one by one so a lot of reboots. After that, you should be fine.
https://bitcointalk.org/index.php?topic=1814199.0;topicseen