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@feraay highly doubt it to be honest, given my experience with what I believe is this same issue. I don't use unraid, but I follow this thread because I have been having all the same symptoms: random hangs with no syslog output - couldn't really find any other relevant info on the web. Disabling the i915 kernel module is the only thing that's made the system stable again. I've been running 5.16 kernels the entire time, and this has been happening all throughout. I'm gonna be trying again soon with the 5.17 series, though not super hopeful.

@accelaptd Biostar Z690A Valkyrie is the only board that fits those requirements that I'm aware of (I spent a very long time looking for additional boards). Running it myself, it works well - x8 HBA in one slot, other slot running a GPU at x8 as well, both direct to the CPU. No other boards have x8/x8 and DDR4 that I'm currently aware of. I actually ended up importing my Z690A from abroad as it wasn't sold locally. One thing additional thing to be aware of that @Brandon_K didn't mention is the DMI bus, and how that will limit things - on Z690 the bandwidth between the CPU and the chipset is equivalent to PCIe Gen4 x8. This bandwidth is shared among _everything_ connected to the chipset, which on most boards is all additional M.2 slots after the first (as that's connected straight to the CPU as PCIe Gen4 x4), all additional PCIe slots, and then stuff like ethernet, USB, etc etc. In many cases, this will be fine, but that is the big advantage of the x8/x8 boards - you can put two high bandwidth PCIe devices onto the motherboard without bottlenecking the chipset.