hi, simpie10.

This thread might help you.
https://bitcointalk.org/index.php?topic=2307023.0;all

When the rig has less main memory,
In order to access too many PCIE devices, allocation to the IO memory map may not be enough.

You can try disabling "some unnecessary PCIE devices" (like HDMI audio on a video card) in device manager.

ty