On my H12 I put in the settings on the following link and its works fine time. I also used the jumper to disable onboard video.
https://forums.servethehome.com/index.php?threads/sm-h12ssl-i-stuck-on-pci-enumeration-only-on-warm-reboot-restart-cold-power-up-fine.39009/#post-366633
James. I got it to boot and reboot.
1. Installed GPU in Slot 6
2. Disabled the onboard video with a jumper.
Disabled the following settings.
SR-IOV
BME DMA MITIGATION
PCIE ARI SUPPORT
PCIE TEN BIT TAG SUPPORT
PCIE SPREAD SPECTRUM
RELAXED ORDERING
NO SNOOP
VGA PRIORITY SET TO OFF BOARD...
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