HPE Superdome

The HPE Superdome is a high-end server computer designed and manufactured by Hewlett Packard Enterprise (formerly Hewlett-Packard). The product's most recent version, "Superdome 2," was released in 2010 supporting 2 to 32 sockets (up to 128 cores) and 4 TB of memory. The Superdome used PA-RISC processors when it debuted in 2000. Since 2002, a second version of the machine based on Itanium 2 processors has been marketed as the HP Integrity Superdome.

The classic PA-RISC Superdome was later renamed HP 9000 Superdome. The HP V-Class was the Superdome's predecessor (which was based on a design acquired from Convex).

The HP Integrity Superdome 2 uses the Intel Itanium 93xx-series microprocessor, known as "Tukwila", and is redesigned with parts from the HP BladeSystem C7000 enclosure.

Since 2012, Intel Itanium 95xx microprocessor Poulson became available. In 2017, Intel announced that their most recent Itanium chip (code-named Kittson) would be their last Itanium update.

In 2016, Hewlett Packard Enterprise released the Superdome X, which is based on Intel Xeon processors, supporting 16 CPU sockets and 24 TB of RAM memory.

Superdome usually runs the HP-UX operating system, although the Itanium 2 version is also compatible with other systems, for example with Microsoft Windows Server 2008 R2, SUSE Linux Enterprise Server 11 SP4, Red Hat Enterprise Linux, Debian Wheezy (Long Term Support for it has ended), and OpenVMS V8.2-1.

There are 4 different generations of the Superdome:

A building block is a cell, a card holding 4 processors and memory. Superdome has a ccNUMA architecture, which means that processors have shorter access times for their cell's memory but longer access times for other cell's memories, and data items are allowed to be replicated across individual cache memories but are kept coherent with one another by cache coherence hardware mechanisms. In this case, a directory-based coherency mechanism is employed.