HP SmartArray 642 PCI-X 0.320Gbit/s

Smart Array 642 Ultra320 SCSI controller board with 64MB cache - 64-bit, 133MHz, PCI-X PC board - Does not include cache memory module or battery, Refurbished The Smart Array 642 Controller is a 64-bit, 133MHz PCI-X, dual channel, SCSI array controller for entry-level hardware-based fault tolerance that allows you to configure up to 6 internal and 14 external hard drives to store up to 2.9 TB of storage.