Its SATA controller is Marvell 88SX6081 (the same as Supermicro 8-port PCI-X card in my recommendations in page 85) and this does not support PM. It is restricted to direct connect SATA interfaces. So you can connect up to 8 SATA drives (8TB if you use 1TB drives) to your controller card.
But as I wrote before, a 2-port PM-aware SATA control card is only $16. If you use two of this card, you should be able to connect 20 HDDs (20TB) (not tested )
- 2 x this card (SiI3132) (to be installed in the main system). (Or use HighPoint RocketRAID 2314 4-port eSATA PM-aware RAID controller PCIe x4 card ~$170.)
- NORCO PRC-4020
- 650W-750W PSU
- 4 x Addonics AD5SAPM 5X1 Internal SATA Port Multiplier (SiI3726)
- 4 x eSATA cable