The RR 4522SGL is an eight-channel, external, 6Gb/s, SAS/SATA, PCIe 2.0 x8 RAID controller.
 
RR4522SGL key Features:
Hardware RAID 0, 1, 5, 6, 10, 50 & JBOD
Superior Reliability
DV Mode Technology
True Host-to-Target SAS 6Gb/s Connectivity
Support Windows, Linux, FreeBSD and Mac OS X Operating System
Thunderbolt™ Aware
Bootable RAID Array Support
Supports OCE / ORLM
4Kn Drive Compatible