Note that on this case I think the best option will be to contact Asus directly since your question is related with RAID specifically.
That's a quite interesting configuration there. I've never heard of another platform that can run the IRST GUI, or another version of the IRST GUI for DOS, etc.
There is a SMALL chance the following may work, since the current versions of the IRST GUI (11.6, 11.7) when used with Windows 7, don't get along with other SATA controllers. Yes I know yours is SAS, but obviously SATA compatible.
It should install, but just warn you about installing an older version. IRST 11.7 in RAID mode is NOT specified as compatible with the ICH10R. It looks like there has been a transition in IRST, starting in 2012, at least partially due to Windows 8, and the continuing changes made to the PCH type chipset (which in a sense has evolved back into a "south bridge" chip like the ICH10R.) We can't just keep installing the newest versions of IRST on our older chipsets, they won't work correctly.