HPE Smart Array P420 Controller (631670-B21) 6Gb/s, PCIe 3.0, Serial Attached SCSI (SAS) RAID controller that provides enterprise class-storage performance and data protection for HPE ProLiant Gen8 servers. SA P420 Controller features eight (8) internal SAS ports and provides advanced storage functionality such as increased server uptime, online RAID level migration with flash back write cache, global online spare, and pre-failure warning. In addition, it facilitates easy migration and data compatibility among all models of HPE Smart Array controllers.

Specifications
Brand: HPE
Model: 631670-B21, 633538-001, 610670-003
Product: Smart Array RAID Controller
Best for: HPE ProLiant Server
Interface: PCIe 3.0 X8
Backup Type: Flash Backed Cache
Number of Logical Drive Supported: 64
Ports: Eight (8) SAS physical links distributed across 2 internal x4 wide port connectors.
Cache: 1 GB
Data Transfer Rate: 6Gbps
RAID Levels Supported: RAID 0, RAID 1, RAID 5, RAID 10, RAID 50

Compatible Systems: 

HPE ProLiant DL Series: DL160 Gen8, DL160 Gen8 Entry, DL160 Gen8 Performance, DL320e Gen8, DL320e Gen8 Base, DL320e Gen8 Entry, DL320e Gen8 Performance, DL380e Gen8, DL380p Gen8, DL380p Gen8 Base, DL380p Gen8 Entry, DL380p Gen8 High Performance, DL380p Gen8 Special, DL385p Gen8, DL385p Gen8 Dedicated Workload, DL385p Gen8 Entry, DL385p Gen8 Maximized Consolidation, DL385p Gen8 Storage, DL560 Gen8, DL560 Gen8 Base, DL560 Gen8 Entry, DL560 Gen8 Performance

HPE ProLiant ML Series: ML310e Gen8, ML310e Gen8 Base, ML310e Gen8 Entry, ML310e Gen8 Performance, ML310e Gen8 v2, ML310e Gen8 v2 Base, ML310e Gen8 v2 Enty, ML310e Gen8 v2 Performance, ML350e Gen8, ML350e Gen8 Base, ML350e Gen8 Entry, ML350e Gen8 Performance, ML350e Gen8 v2, ML350p Gen8