HP SmartArray 641 PCI-X 0.320Gbit/s

Smart Array 641 Ultra320 SCSI controller with 64MB cache - 64-bit, 133MHz - Requires one PCI-X slot - Does not include a cache module or a battery The Smart Array 641 Controller is a 64-bit, 133MHz PCI -X, single channel, SCSI array controller for entry-level hardware-based fault tolerance that allows you to configure up to 6 internal hard drives to store up to 1.80 TB of storage.