I think you will have to set up the disks in the RAID even if they are set them up as RAID 0.

I set up my r610 over the weekend and I have one SSD and 5 HDD I set up the 5 in a RAID and forgot to set up the SSD for the OS, when installing the OS i could see the HDD but not the SSD. I had to reboot and initialize that SSD as a disk in RAID 0 and I was back in business. I flashed the PERC when I started but the drives were still not active till RAID was set