The HP OEM LSI22320 has only one internal connector instead of two internal connectors as on the retail version.

The following product description is copied from LSI's web site for LSI22320.

• The LSI Logic LSI22320 Ultra320 SCSI Dual Channel host adapter delivers the speed and bandwidth required by todays data intensive storage applications.
• With 640 MBps and capability of up to 100,000 I/Os per second, this adapter is ideal for enterprise servers and high performance workstations working in environments where data intensive, high capacity and high availability applications are being used.
• It also utilizes Fusion-MPT architecture that allows for thinner drivers for better performance (up to 100,000 I/Os per sec) while adding value and flexibility at the firmware level. 
• With PCI-X throughput of 1056 MBps, this adapter also capitalizes on maximum system performance for those systems needing it; yet is backward compatible with existing PCI systems.
• It features LSI Logic SureLINK domain validation technology ensuring data integrity by intelligently testing the network before completing negotiation.
• Ultra320 SCSI, PCI-X 133MHz
• 640 MBps of Ultra320 speeds on two channels
• Fusion-MPT architecture featuring 100,000 IO/s
• Integrated Mirroring for boot volume and OS protection
• Connects up to 30 internal/external connects such as JBOD and hard disk drives
• Supports all major operating systems
• Supports Sun and Intel based systems