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((Short description|Workstation computer series))
((more citations needed|date=October 2019))
[[File:SGI Tezro.jpg|thumb|SGI Tezro]]
[[File:Silicon Graphics Tezro Workstation.jpg|thumb|right|SGI Tezro front]]
[[File:Silicon Graphics Tezro (1) Rackmount.jpg|thumb|right|SGI Tezro workstation - rack mount version]]
The '''SGI Tezro''' is a series of high-end [[computer workstation]]s sold by [[Silicon Graphics|SGI]] from 2003 until 2006. Using MIPS CPUs and running [[IRIX]], it is the immediate successor to the [[SGI Octane]] line. The systems were produced in both rack-mount and tower versions, and the series was released in June 2003 with a list price of ((USD|20,500)). The Tezro was released alongside the [[SGI Onyx4]] and rack-mountable Tezros share many components with it,<ref name="SGI 2003 at fxguide">((cite web | title=Exclusive Coverage of SGI 2003 New Product Line – Part 1 – Overview | date=July 14, 2003 | first=Mike | last=Seymour | publisher=fxguide | url=https://www.fxguide.com/featured/exclusive_coverage_of_sgi_2003_new_product_line_-_part_1_-_overview/ | accessdate=December 15, 2015))</ref> including plastic skins. The rack-mounted Tezros are functionally very similar to an Infinite Performance-equipped SGI Onyx350. Tezro marked the return of the original cube logo to SGI machines.

It was replaced in 2008 by the [[SGI Virtu]] product line.

==Technical specifications==
=== Architecture ===
Similar to other SGI systems, the Tezro uses a non-blocking [[crossbar switch|crossbar interconnect]] to connect all subsystems together. Tezro is based on SGI's [[Origin 3000]] architecture.<ref>((Cite web|title=sgistuff.net : Hardware : Systems : Tezro|url=http://sgistuff.net/hardware/systems/tezro.html|access-date=2021-05-24|website=sgistuff.net))</ref>

[[ARCS (computing)|ARCS]] is provided as the boot [[firmware]], as with other SGI computer systems of that era.

=== Processors ===
Tezro systems use two or four 64-bit [[MIPS Technologies|MIPS]] [[R10000#R16000|R16000]] [[microprocessor]]s.

The following R16000 processor types were available options:

{| class="wikitable"
|'''L2 Cache:'''
|'''Dual (MHz):'''
|'''Quad (MHz):'''
|-
|4 MB
|700; 800
|700; 800
|-
|8 MB
|700; 800
|700; 800
|-
|16 MB
|1000
|1000
|-
|}

Node boards from Onyx/Origin 350/3900 systems are compatible and use the same RAM. For example, a quad-R16K/700&nbsp;MHz (8 MB L2) board from a CX-Brick will work in a Tezro; likewise, other boards up to the same quad-1&nbsp;GHz edition.<ref>((cite web |url=http://forums.nekochan.net/viewtopic.php?f=14&t=16727444 |title=Nekochan Net • View topic - Tezro: 4x700mhz ((!)) 8GB ((!)) DCD ((!)) V12 ((!)) SAS ((!)) FIBER |website=forums.nekochan.net |url-status=dead |archive-url=https://web.archive.org/web/20130616231206/http://forums.nekochan.net/viewtopic.php?f=14&t=16727444 |archive-date=2013-06-16)) </ref>

=== Memory ===
The Tezro shipped with 512 MB of [[Double pumped|DDR]] [[SDRAM]]. It can be expanded using proprietary [[DIMM]]s. The tower version can hold up to 8 GB of [[main memory]] total, and the rack version can hold up to 8 GB per brick (2 bricks can be directly linked by [[NUMAlink]] cables, or up to 8 with the use of a NUMAlink Router).

=== Graphics ===
Tezro supports the [[SGI VPro|VPro]] V10 and V12 graphics options. Dual-channel options were produced for the desktop variants allowing up to two 1920x1200 displays, while dual-head, dual-channel were available for the rack version, allowing a fully equipped rackmount Tezro to drive up to four 1920x1200 displays at once.

=== Audio ===
Tower systems shipped with analog audio output as standard, and [[PCI bus|PCI]] cards provide audio capabilities (including 2-channel 24-bit AES and 8-channel ADAT connectors) on rack-mountable versions.

== Expansion ==
The number of available 64-bit PCI slots included in a Tezro system depends upon the number of CPUs installed in the system:

* 7 133/100&nbsp;MHz slots in two- or four-CPU tower systems
* 3 133/100&nbsp;MHz slots in single-CPU tower systems
* 6 100&nbsp;MHz slots and two 66&nbsp;MHz slots in 4U rackmountable systems
* 2 100&nbsp;MHz slots and one 66&nbsp;MHz slot in 2U rackmountable systems.

All PCI slots in each Tezro model are 3.3V card slots.

A single [[SCSI|U160 SCSI]] connector was produced for attaching external peripherals, as was an optional [[FireWire]] card.

((SGI computer timeline))

==References==
((Reflist))

== External links ==
<!-- *[http://www.sgi.com/products/remarketed/tezro/Tezro home page] -->
<!-- *[http://www.egn.de/produkte/sgi/datenblaetter/tezro_ataglance.pdf Press release announcing the Tezro] -->
*[http://techpubs.spinlocksolutions.com/irix/remote-irix-6.5-installation-from-linux.html Remotely installing SGI IRIX 6.5 from a GNU/Linux server]

((Silicon Graphics))

((DEFAULTSORT:Sgi Tezro))
[[Category:SGI workstations|Tezro]]
[[Category:Advanced RISC Computing]]
[[Category:64-bit computers]]

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