If you're not booting from the RS2WC080, try to disable the RAID BIOS in RAID BIOS console. You may also try to disable other unnecessary OpROM in BIOS, like the boot ROM of onboard NIC.
Thanks so much for the reply.
I tried to disable the RAID BIOS in RS2WC080 RAID BIOS console as you suggested. It was a good thought but unfortunately not the solution.
I couldn't find a setting in the 680i bios to specifically disable only the bios on the onboard nics but there was a setting called "mac config" which allowed me to disable the nic itself (so I turned them both off). As an experiment I also later disabled virtually every feature on the mobo (including features I needed) other than the drive necessary to boot. Still no luck.
Just so no one thinks this is open, I'm closing it as "answered". The final answer seems to be the EVGA 680I motherboard has an incompatiability with RS2WC080 so I just purchased a new Intel motherboard.