Can confirm I can’t see IntelRCSetup in the bios anywhere 
Hang with me and I’ll do some testing with the bios and get back you. The board is currently in use in my Unraid server.
Thanks again
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@Lost_N_BIOS
Have just finished testing the 4 bios .CAPs.
I wasn’t able to strip the board down to a single card and test on a slot by slot basis, I have all pcie 5 slots populated as I would like them in the server.
Added some screenshots below.
http://s000.tinyupload.com/index.php?fil…691896364676020
I tested all 4 and didn’t notice any changes after flashing each bios, no split in the bus and no noticeable difference in HWINFO. Each time I loaded optimised defaults as advised. The IIO-2 4x4x bios seemed to cause a few issues with USB but that was my only observation.
The slot/bus order is:
1 - Root Port 3c
2 - Root Port 3a (IOU1)
3 - Root Port 2a (IOU0)
4 - Root Port 2c
5 - Root Port 1 (IOU2)
Looking to split slots 1, 3 and 5 from 8x to 4x4x
Hope this helps for now. Any suggestions, thoughts or anything else I need to check?
Thanks again