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?
https://bitcointalk.org/index.php?topic=1814199.0According to some posts in that thread, it should definitely be possible to get more than two cards running using your current board.
Can you provide more information? (RAM, PSU, OS, powered/unpowered risers, basically everything that might be relevant.)
When you try to run more than 2 GPUs, are the first two plugged directly into the x16 slots?