Editing HPE Integrity Servers (section)

==General==
Over the years, Integrity systems have supported [[Windows Server]], [[HP-UX#HP-UX 11i operating environments|HP-UX 11i]], [[OpenVMS]], [[NonStop (server computers)|NonStop]], [[Red Hat Enterprise Linux]] and [[SUSE Linux Enterprise Server]] [[operating systems]] on Integrity servers.<ref>{{Cite web |title= HP Integrity Servers |url= http://h20341.www2.hp.com/integrity/us/en/systems/integrity-systems-overview.html |work= Web site |access-date= April 3, 2010 |archive-date= April 7, 2010 |archive-url= https://web.archive.org/web/20100407035156/http://h20341.www2.hp.com/integrity/us/en/systems/integrity-systems-overview.html |url-status= dead }}</ref> As of 2020, the operating systems that are supported are HP-UX 11i,<ref>{{Cite web|title=HPE INTEGRITY WITH HP-UX|url= https://www.hpe.com/us/en/servers/hp-ux.html|work= Web site}}</ref> OpenVMS and NonStop.

Early Integrity servers were based on two closely related [[chipset]]s. The zx1 chipset supported up to 4 CPUs and up to 8 [[PCI-X]] busses. They consisted of three distinct [[application-specific integrated circuit]]s; a memory and I/O controller, a scalable memory adapter and an I/O adapter. The [[PA-8800]] and [[PA-8900]] microprocessors use the same bus as the Itanium 2 processors, allowing HP to also use this chipset for the [[HP 9000]] servers and C8000 workstations.

The memory and I/O controller can be attached directly to up to 12 [[DDR SDRAM]] slots. If more slots than this are needed, two scalable memory adapters can be attached instead, allowing up to 48 memory slots. The chipset supports DIMM sizes up to 4 GB, theoretically allowing a machine to support up to 192 GB of RAM, although the largest supported configuration was 128 GB.

The sx1000 chipset supported up to 64 CPUs and up to 192 PCI-X buses. The successor chipsets were the zx2 and sx2000 respectively.