In a few months I'm going to set up 2x6TB drives in RAID1 to backup an array of 4x2TB drives in RAID5. In addition to this I'm going to have an SSD for the NAS' OS + a 320GB scratch drive for a Plex DVR. If you're keeping count, that's 8 SATA drives scattered all over the very large Phanteks Enthoo Pro, which also needs SATA Power for the fan controller.
My EVGA B3 has only 2 dedicated ports for SATA cables. I noticed the pin layout on the Perif port is identical to the SATA cables, so I was curious if a 3rd 4xSATA connector power cable can be plugged into the Perif out, or if I should be looking at extensions.