Syba 5 Port SATA II Internal Port Multiplier with PCI Bracket Mounting (SY-PCI40037) JMB393 is a self-contained storage processor chip which completely frees up the main CPU loading. Supports RAID levels: 0 / 1 / 3 / 5 / 10 / JBOD / CLONE RAID 3 / 5 write-back cache to enhance performance