Hi Talden and welcome to SevenForums,
What you are proposing certiainly should be possible - its no different from having an SSD+RAID0, or SSD+RAID1 combination. Please try this, if you already haven't:
1. Physically unplug the 4 xHDD's from the motherboard (simply disconnecting the SATA cables is sufficient):
- at this point, only the SSD should be connected
2. In the BIOS, change to AHCI mode, and proceed with the installation.
3. Once installation is completed, shut down the PC.
4. Reconnect the 4 x HDD's.
5. Boot the PC, and in BIOS, change back to RAID, and contunue booting as normal.
Please post back if that worked.
Regards,
Golden