HP Integrity servers are the Itanium2 based offshoot of the Mid-Range HP9000 series machines.

In 2003 Hewlett Packard unveiled the Integrity line of servers which cater to the same segment as some HP9000 servers however the line is only available with Itanium2 processors. Beginning in 2009, rp-xxxx PA-RISC based platforms will no longer be available through HP which will leave the Integrity family as the single Mid-Range solution from HP.

PA-RISC processors have been a staple in HPs mid-range and high-end servers since the early 1980s so this transition will mark the end of an era. The current Integrity lineup has offerings ranging from their rx-1600 which is a 1U, 1/2-Way machine all the way up to the rx-8620-16 17U, 16/32-Way monster. The latter of which matches the socket count of the smallest of HPs flagship Superdome series, so the Integrity family covers a sizable segment.

Delving into the internals, the workstation and entry level server configurations are based around the zx1 "Pluto" chipset which can scale up to 4 sockets, while the higher end models use the same sx1000 cell technology found in Superdome servers. The zx1 chipset employs three additional components, the HP chipset & memory I/O controller for connecting memory and CPUs together, the HP chipset I/O adapter which acts as a bridge to which additional bus' and other I/O devices are attached (PCI-X, SCSI, IDE, NIC and USB) and 2x scalable memory adapter chips to facilitate more memory banks when used in a server configuration. On the other end of the spectrum, HPs sx1000 is a completely different technology from the ground up.