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But through the entire tree of menus, I was only able to find an IRQ for Serial Port 1 and Serial Port 2, under NCT6779D Super IO Configuration. Wikipedia's [https://en.wikipedia.org/wiki/Interrupt_request_(PC_architecture) article on interrupt requests] notes that, "PCI Express does not have physical interrupt lines at all, and uses MSI exclusively." So I guess IRQs are no longer a big deal (they "went the way of the dodo," as Ed says). With no other way to label the PCIe drives from the BIOS menu making itself clear, I exited and rebooted the computer to proceed with the installation.
 
Interesting side note: the mobo datasheet notes that the motherboard comes with utilities to set up RAID arrays. But there doesn't seem to be any benefit of doing it on the motherboard over doing it in the Ubuntu partitioner.
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