HP 291966-B21 | SmartArray 641 Single Channel Ultra320 with Battery and 128M

1. Interface Type: PCI-X
2. Data Transfer Rate: 320 MBps
3. RAID Levels: RAID 0, RAID 1, RAID 10, RAID 5, RAID 50
4. Buffer Size: 128 MB
5. Number of Channels: 1
6. Supported Devices: Hard drive, tape drive
7. Max Storage Devices Qty: 56
8. Processor: 1 x Intel IOP321
9. RAM Installed: 64 MB
10. Battery Backup: Yes
11. Dimensions: 6.6 x 2.5 x 12.4 inches
12. Weight: 1.5 pounds

Helpful Notes:
1. The HP SmartArray 641 is compatible with a wide range of HP ProLiant servers.
2. The battery backup ensures that data is not lost in case of a power failure.
3. The SmartArray 641 supports online RAID level migration and capacity expansion.