It was running on bios v1002 fine, but now it seems it won't even boot with 5 GPUs connected.

I set 4G encoding enabled, and set all PCI/PEG/PCH links to gen1 and I've tried reinstalling Win 10 and both with and without the AMD BC drivers installed - nothing works.  All GPUs work fine when limited to 4.

Anyone else is experiencing the same issue?