View source for Macintosh Quadra

{{Short description|Family of personal computers  by Apple}}
[[File:Quadra 840AV & Macintosh 16-inch Color Display & AppleDesign Powered Speakers & Apple Extended Keyboard II & Apple Desktop Bus Mouse II.jpg|thumb|300px|A [[Macintosh Quadra 840AV]] with accompanying keyboard, mouse, display, and speakers]]
The '''Macintosh Quadra''' is a family of [[personal computer]]s designed, manufactured and sold by [[Apple Inc.|Apple Computer, Inc.]] from October 1991 to October 1995. The Quadra, named for the [[Motorola 68040]] [[central processing unit]], replaced the [[Macintosh II family]] as the high-end [[Mac (computer)|Macintosh]] model.

The first models were the [[Macintosh Quadra 700|Quadra 700]] and [[Macintosh Quadra 900|Quadra 900]], both introduced in October 1991, with the latter discontinued after six months and replaced by the [[Macintosh Quadra 950|Quadra 950]]. The [[Macintosh Quadra 800|Quadra 800]] was added in February 1993 (succeeding the Quadra 700), followed the multimedia-focused [[Macintosh Quadra 840AV|840AV]] at the end of July 1993. The [[Macintosh Centris]] line was merged with the Quadra in October 1993, adding the [[Macintosh Quadra 610|610]], [[Macintosh Quadra 650|650]] and [[Macintosh Quadra 660AV|660AV]] to the range. The [[Macintosh Quadra 605|605]] (also sold as the Performa 475 or LC 475) was also introduced in October 1993, featuring the 68LC040 (lacking an FPU) as standard although it could be upgraded to the full 68040. After the introduction of the [[Power Macintosh]] line in early 1994, the [[Macintosh Quadra 630|Quadra 630]] (using the "full" [[Motorola 68040]] instead of the LC's [[Motorola 68LC040|68LC040]]) became the last new Quadra member. The Quadra 950 continued to be sold until October 1995.

The product manager for the Quadra family was Frank Casanova who was also the Product Manager for the [[Macintosh IIfx]].

==Models==
{{Multiple image
| perrow  =3
| total_width=400
| header   =Quadra towers
| image1   =Macintosh_Quadra_700.png
| caption1 =[[Macintosh Quadra 700]]
| image2   =Macintosh_Quadra_900.jpg
| caption2 =[[Macintosh Quadra 900]]
| image3   =Quadra_950_hero.jpg
| caption3 =[[Macintosh Quadra 950|Quadra 950 / Workgroup Server 95]]
}}
{{Multiple image
| perrow  =3
| total_width=400
| header   =Quadra "pizza boxes"
| image5   =Macintosh_Quadra_610.jpg
| caption5 =[[Macintosh Quadra 610|Quadra 610 / Workgroup Server 60]]
| image6   =Macintosh_Centris_660AV.jpg
| caption6 =[[Macintosh Quadra 660AV]]
| image7   =Macintosh_quadra_605_warm.jpg
| caption7 =[[Macintosh Quadra 605]]
}}
{{Multiple image
| perrow            = 2
| total_width       = 400
| header            = Quadra desktops
| image7            = Macintosh_Quadra_650.jpg
| caption7          = [[Macintosh Quadra 650|Quadra / Centris 650]]
| image8            = Macintosh_LC_630.jpg
| caption8          = [[Macintosh Quadra 630|Quadra / LC / Performa 630]]
| image1            = 
}}
{{Multiple image
| perrow  =2
| total_width=400
| header   =Quadra later towers
| image9   =Apple mac quadra 800.jpg
| caption9 =[[Macintosh Quadra 800|Quadra 800 / Workgroup Server 80]]
| image10  =Macintosh_Quadra_840AV.jpg
| caption10=[[Macintosh Quadra 840AV|Quadra 840AV]]
}}
The first computers bearing the Macintosh Quadra name were the [[Macintosh Quadra 700|Quadra 700]] and [[Macintosh Quadra 900|Quadra 900]], both introduced in 1991 with a [[central processing unit]] (CPU) speed of 25 [[hertz|MHz]]. The 700 featured identical case dimensions as the [[Macintosh IIci]] but vertically oriented as a mini-tower, with a [[Processor Direct Slot]] (PDS) expansion slot, while the latter was a newly designed [[Computer_tower#Full-tower|full-tower case]] with five [[NuBus]] expansion slots and one PDS slot. The 900 was replaced in 1992 with the very similar [[Macintosh Quadra 950|Quadra 950]], with a faster CPU speed of 33&nbsp;MHz and improved graphics support. 

The [[Macintosh Quadra 800|Quadra 800]] was added in February 1993. It was positioned below the flagship Quadra 950 and succeeded the Quadra 700 (which was discontinued shortly after the Quadra 800's announcement). Debuting at half the price of the Quadra 950, the Quadra 800 featured the same [[Motorola 68040]] 33&nbsp;MHz processor as the 950 but its additional [[interleaved memory|interleaved]] [[RAM]] running at 70 ns, as well as an enhanced video system and [[SCSI]] bus, enabled it to outperform the 950.<ref name=macworld>{{cite magazine
| title = Quadra 800 - The new high-end Mac performs like a Quadra 950 at a lower cost
| url = https://archive.org/stream/MacWorld_9304_April_1993#page/n117/mode/2up
| pages = 114–119
| date = April 1993
| magazine = [[Macworld]]
| first = Galen
| last = Gruman
| volume = 10
| issue = 4
}}</ref> The Quadra 800's [[Computer tower|mid-tower]] case had four drive bays, giving it more expansion options than the Quadra 700's mini-tower, while having a form factor still considerably shorter than the Quadra 900/950's full tower. <ref>{{cite web
| url = http://www.lowendmac.com/roadapples/q800case.shtml
| title = Road Apples - The Quadra 800 case
| website = Low End Mac
| first = Dan
| last = Knight
| date = 8 November 1999
| access-date = April 14, 2006
| archive-date = September 7, 2017
| archive-url = https://web.archive.org/web/20170907122224/http://www.lowendmac.com/roadapples/q800case.shtml
| url-status = live
}}</ref> 

In July 1993, the [[Macintosh Quadra 840AV|Quadra 840AV]] and [[Macintosh Quadra 660AV|660AV]] (originally branded as Centris 660AV) were introduced at 40&nbsp;MHz and 25&nbsp;MHz respectively. They included an [[AT&T Corporation|AT&T]] 3210 [[Digital signal processor]] and [[S-Video]] and [[composite video]] input/output ports, as well as [[compact disc|CD]]-quality [[microphone]] and audio output ports.<ref>{{cite web | title=MacWorld 9310 October 1993 | date=October 1993 | url=https://archive.org/details/MacWorld_9310_October_1993/page/n87/mode/2up }}</ref> The AV models also introduced [[PlainTalk]], consisting of the text-to-speech software [[MacinTalk#Original MacInTalk|MacinTalk Pro]] and speech control (although not dictation). However, all of these features were poorly supported in software and a DSP was not installed in later AV Macs, which were based on the more powerful [[PowerPC 600#PowerPC 601|PowerPC 601]] - a CPU powerful enough to handle the coprocessor's duties on its own.<ref>{{cite web | title=MacWorld 9309 September 1993 | date=September 1993 | url=https://archive.org/details/MacWorld_9309_September_1993/page/n35/mode/2up }}</ref>

The Quadra name was also used for the successors to the [[Macintosh Centris|Centris]] models that briefly existed during 1993: the [[Macintosh Quadra 610|610]], the [[Macintosh Quadra 650|650]] and the [[Macintosh Quadra 660AV|660AV]]. Centris was a "mid-range" line of systems (featuring slower 68040 CPUs, often the 68LC040 which omits the FPU), between the existing Quadra on the high end (featuring the faster 68040 CPU) and the [[Macintosh LC|LC]] on the low end (built around the 68030 CPU), but it was later decided that there were too many product lines and so Centris was dropped in October 1993. 

The [[Macintosh Quadra 605|605]] (also sold as the Performa 475 or LC 475) was also introduced in October 1993, featuring the 68LC040 as standard although it could be upgraded to the full 68040. At that point, the Quadra lineup consisted of the 950 using a full tower case, the "800-series" machines with a [[Mid-tower]] case design ([[Macintosh Quadra 800|Quadra 800]] and [[Macintosh Quadra 840AV|840AV]]), and the "600-series" (the [[Macintosh Quadra 605|Quadra 605]], [[Macintosh Quadra 610|Quadra 610]] and [[Macintosh Quadra 660AV|660AV]] had [[pizza box form factor|pizza box]] desktop cases, while the Quadra 650 had a taller desktop case). 

After the [[Power Macintosh]] line was launched in early 1994, only one more member of the Quadra family was released which was in July 1994, the [[Macintosh Quadra 630|Quadra 630]], which was a variation of the LC 630 using a "full" [[Motorola 68040]] instead of the LC's [[Motorola 68LC040|68LC040]], and introduced together with it in 1994. The 630 was the first Mac to use an [[Advanced Technology Attachment|IDE]] based drive bus for the internal [[hard disk]] drive, whereas all earlier models had used [[SCSI]]. All of the other Quadra models introduced in 1993 would be discontinued in 1994 after being available for sale for a year, to be replaced by Power Macintosh models, except for the Quadra 950 which continued to be sold until October 1995. 

==Branding==
Apple hired marketing firm Lexicon Branding to come up with the name. Lexicon chose the name Quadra hoping to appeal to engineers by evoking technical terms like quadrant and quadriceps.<ref>{{Cite news |last=Beckett |first=Jamie |date=23 Oct 1992 |title=Finding names in unusual places |work=[[San Francisco Chronicle]]}}</ref>

The first three [[Apple Workgroup Server]] models, the WGS 60, the WGS 80 and the WGS 95 (mostly called "AWS 95" for "Apple Workgroup Server") were based on the Quadra 610 (originally Centris 610), the Quadra 800 and the Quadra 950, respectively.

In October 1993, to keep pace with the growing number of relatively affordable [[IBM compatible]]s powered by the [[Intel 80486]], Apple introduced or rebranded numerous "entry-level" Quadra models (particularly the 605, 610, and later 630) for home or education use with their 68LC040 CPU, in comparison to the original models (700, 800/840AV, 900/950) which were positioned as high-end workstations due to their 68040 CPU and higher RAM ceilings. These low-end models arguably devaluated the Quadra branding, as the "600-series" also featured the higher-end models 650 and 660AV that more faithful to the original Quadra family (despite being rebranded from Centris).  Furthermore the 605 and 630 were sold under the LC and Performa labels which created further confusion among consumers, whereas the more expensive Quadra models did not have an alternative branding. <ref>{{cite magazine
| url = https://archive.org/stream/MacWEEKV07N25/MacWEEK_V07N25#page/n31/mode/2up
| first1 = Jon
| last1 = Swartz
| first2 = Lisa
| last2 = Picarille
| date = 21 June 1993
| title = Dealers not sold on Apple rebates
| page = 32-34
| volume = 7
| issue = 25
| magazine = [[MacWEEK]]
}}</ref> Ultimately, the Quadra family's demise was hastened as models were succeeded by the [[Power Macintosh]], the latter family aiming to compete with IBM compatibles powered by the [[Pentium (original)|Pentium (P5)]].

==Processor==
The transition to the Motorola 68040 was not as smooth as the previous transitions to the [[Motorola 68020]] or [[Motorola 68030]]. Due to the Motorola 68040's split instruction and data caches, the Quadra had compatibility problems with [[self-modifying code]] (including relocating code, which was common under the [[Classic Mac OS memory management|Macintosh memory model]]). Apple partially fixed this by having the basic Mac OS memory copy call flush the caches. This solved the vast majority of stability problems, but negated much of the Motorola 68040's performance improvements. Apple also introduced a variant of the memory copy call that did not flush the cache.<ref>{{Cite web |title=Apple Developer Connection - BlockMove 11 |url=https://developer.apple.com/documentation/Hardware/DeviceManagers/pci_srvcs/pci_cards_drivers/PCI_BOOK.16a.html |url-status=dead |archiveurl=https://web.archive.org/web/20040911052814/http://developer.apple.com/documentation/Hardware/DeviceManagers/pci_srvcs/pci_cards_drivers/PCI_BOOK.16a.html |archivedate=September 11, 2004}}</ref> The new trap was defined in such a way that calling it on an older version of Mac OS would simply call the previous memory copy routine. The net effect of this was that many complex applications were initially slow or prone to crashing on the 68040, although developers quickly adapted to the new architecture by relying on Apple's memory copy routines rather than their own (or flushing the cache) and using the memory copy that did not flush the cache when appropriate (most of the time).

== Specifications ==
{{All are obsolete}}

{| class="wikitable mw-collapsible" style="font-size:small; text-align:center"

|-
! colspan=2 | Model
<!--Q700-->! style="background:#FF9999" | [[Macintosh Quadra 700|Quadra 700]]<ref name="EM700">{{Cite web |title=Macintosh Quadra 700 Specs: EveryMac.com |url=https://everymac.com/systems/apple/mac_quadra/specs/mac_quadra_700.html |website=everymac.com |access-date=2022-06-19 |archive-date=2021-10-31 |archive-url=https://web.archive.org/web/20211031100552/https://everymac.com/systems/apple/mac_quadra/specs/mac_quadra_700.html |url-status=live }}</ref><ref name="LEM700">{{Cite web|url=https://lowendmac.com/1991/quadra-700/|title=Quadra 700 &#124; Low End Mac|website=lowendmac.com|date=21 October 1991 |access-date=2022-06-20|archive-date=2022-06-20|archive-url=https://web.archive.org/web/20220620134915/https://lowendmac.com/1991/quadra-700/|url-status=live}}</ref>
<!--Q900-->! style="background:#FF9999" | [[Macintosh Quadra 900|Quadra 900]]<ref name="EM900">{{Cite web|url=https://everymac.com/systems/apple/mac_quadra/specs/mac_quadra_900.html|title=Macintosh Quadra 900 Specs: EveryMac.com|website=everymac.com|access-date=2022-06-20|archive-date=2022-06-20|archive-url=https://web.archive.org/web/20220620130353/https://everymac.com/systems/apple/mac_quadra/specs/mac_quadra_900.html|url-status=live}}</ref><ref name="LEM900">{{Cite web|url=https://lowendmac.com/1991/quadra-900/|title=Quadra 900 &#124; Low End Mac|website=lowendmac.com|date=21 October 1991 |access-date=2022-06-20|archive-date=2022-06-20|archive-url=https://web.archive.org/web/20220620134854/https://lowendmac.com/1991/quadra-900/|url-status=live}}</ref>
<!--Q950-->! style="background:#FF9999" | [[Macintosh Quadra 950|Quadra 950]]<ref name="EM950">{{Cite web |title=Macintosh Quadra 950 Specs: EveryMac.com |url=https://everymac.com/systems/apple/mac_quadra/specs/mac_quadra_950.html |website=everymac.com |access-date=2022-06-19 |archive-date=2022-06-19 |archive-url=https://web.archive.org/web/20220619174223/https://everymac.com/systems/apple/mac_quadra/specs/mac_quadra_950.html |url-status=live }}</ref><ref name="LEM950">{{Cite web|url=https://lowendmac.com/1992/quadra-950/|title=Quadra 950 &#124; Low End Mac|website=lowendmac.com|date=18 May 1992 |access-date=2022-06-20|archive-date=2022-06-20|archive-url=https://web.archive.org/web/20220620134856/https://lowendmac.com/1992/quadra-950/|url-status=live}}</ref>
<!--Q800-->! style="background:#FF9999" | [[Macintosh Quadra 800|Quadra 800]]<ref name="EM800">{{Cite web |title=Macintosh Quadra 800 Specs: EveryMac.com |url=https://everymac.com/systems/apple/mac_quadra/specs/mac_quadra_800.html |website=everymac.com |access-date=2022-06-19 |archive-date=2022-06-19 |archive-url=https://web.archive.org/web/20220619174224/https://everymac.com/systems/apple/mac_quadra/specs/mac_quadra_800.html |url-status=live }}</ref><ref name="LEM800">{{Cite web|url=https://lowendmac.com/1993/quadra-800/|title=Quadra 800 &#124; Low End Mac|website=lowendmac.com|date=10 February 1993 |access-date=2022-06-20|archive-date=2022-06-20|archive-url=https://web.archive.org/web/20220620134856/https://lowendmac.com/1993/quadra-800/|url-status=live}}</ref>
<!--Q650-->! style="background:#FF9999" | [[Macintosh Quadra 650|Quadra 650]]<ref name="EM650">{{Cite web|url=https://everymac.com/systems/apple/mac_quadra/specs/mac_quadra_650.html|title=Macintosh Quadra 650 Specs: EveryMac.com|website=everymac.com|access-date=2022-06-20|archive-date=2022-06-20|archive-url=https://web.archive.org/web/20220620130352/https://everymac.com/systems/apple/mac_quadra/specs/mac_quadra_650.html|url-status=live}}</ref><ref name="LEM650">{{Cite web|url=https://lowendmac.com/1993/quadra-650/|title=Quadra 650 &#124; Low End Mac|website=lowendmac.com|date=21 October 1993 |access-date=2022-06-20|archive-date=2022-06-20|archive-url=https://web.archive.org/web/20220620134855/https://lowendmac.com/1993/quadra-650/|url-status=live}}</ref><br/>(Centris 650)
<!--Q610-->! style="background:#FF9999" | [[Macintosh Quadra 610|Quadra 610]]<ref name="EM610">{{Cite web|url=https://everymac.com/systems/apple/mac_quadra/specs/mac_quadra_610.html|title=Macintosh Quadra 610 (PC) Specs: EveryMac.com|website=everymac.com|access-date=2022-06-20|archive-date=2022-06-20|archive-url=https://web.archive.org/web/20220620130355/https://everymac.com/systems/apple/mac_quadra/specs/mac_quadra_610.html|url-status=live}}</ref><ref name="LEM610">{{Cite web|url=https://lowendmac.com/1993/quadra-610/|title=Quadra 610 &#124; Low End Mac|website=lowendmac.com|date=21 October 1993 |access-date=2022-06-20|archive-date=2022-06-20|archive-url=https://web.archive.org/web/20220620134855/https://lowendmac.com/1993/quadra-610/|url-status=live}}</ref><br/>(Centris 610)
<!--Q660-->! style="background:#FF9999" | [[Macintosh Quadra 660AV|Quadra 660AV]]<ref name="EM660">{{Cite web|url=https://everymac.com/systems/apple/mac_quadra/specs/mac_quadra_660av.html|title=Macintosh Quadra 660AV Specs: EveryMac.com|website=everymac.com|access-date=2022-06-20|archive-date=2021-08-22|archive-url=https://web.archive.org/web/20210822171826/https://everymac.com/systems/apple/mac_quadra/specs/mac_quadra_660av.html|url-status=live}}</ref><ref name="LEM660">{{Cite web|url=https://lowendmac.com/1993/centris-660av-quadra-660av/|title=Centris 660av (Quadra 660av) &#124; Low End Mac|website=lowendmac.com|date=29 July 1993 |access-date=2022-06-20|archive-date=2022-06-20|archive-url=https://web.archive.org/web/20220620134907/https://lowendmac.com/1993/centris-660av-quadra-660av/|url-status=live}}</ref><br/>(Centris 660AV)
<!--Q840-->! style="background:#FF9999" | [[Macintosh Quadra 840AV|Quadra 840AV]]<ref name="EM840">{{Cite web |title=Macintosh Quadra 840AV Specs: EveryMac.com |url=https://everymac.com/systems/apple/mac_quadra/specs/mac_quadra_840av.html |website=everymac.com |access-date=2022-06-19 |archive-date=2022-06-19 |archive-url=https://web.archive.org/web/20220619174225/https://everymac.com/systems/apple/mac_quadra/specs/mac_quadra_840av.html |url-status=live }}</ref><ref name="LEM840">{{Cite web|url=https://lowendmac.com/1993/quadra-840av/|title=Quadra 840av &#124; Low End Mac|website=lowendmac.com|date=29 July 1993 |access-date=2022-06-20|archive-date=2022-06-20|archive-url=https://web.archive.org/web/20220620134911/https://lowendmac.com/1993/quadra-840av/|url-status=live}}</ref><br/>
<!--Q605-->! style="background:#FF9999" | [[Macintosh Quadra 605|Quadra 605]]<ref name="EM605">{{Cite web|url=https://everymac.com/systems/apple/mac_quadra/specs/mac_quadra_605.html|title=Macintosh Quadra 605 Specs: EveryMac.com|website=everymac.com|access-date=2022-06-20|archive-date=2022-06-20|archive-url=https://web.archive.org/web/20220620130354/https://everymac.com/systems/apple/mac_quadra/specs/mac_quadra_605.html|url-status=live}}</ref><ref name="LEM605">{{Cite web|url=https://lowendmac.com/1993/quadra-605/|title=Quadra 605 &#124; Low End Mac|website=lowendmac.com|date=18 October 1993 |access-date=2022-06-20|archive-date=2021-11-04|archive-url=https://web.archive.org/web/20211104222852/https://lowendmac.com/1993/quadra-605/|url-status=live}}</ref><br/>([[Macintosh LC 475|LC 475]], [[Macintosh Performa 475|Performa 475]], [[Macintosh Performa 476|Performa 476]])
<!--Q630-->! style="background:#FF9999" | [[Macintosh Quadra 630|Quadra / LC / Performa 630]]<ref name="EM630">{{Cite web|url=https://everymac.com/systems/apple/mac_quadra/specs/mac_quadra_630.html|title=Macintosh Quadra 630 Specs: EveryMac.com|website=everymac.com|access-date=2022-06-19|archive-date=2022-06-19|archive-url=https://web.archive.org/web/20220619211010/https://everymac.com/systems/apple/mac_quadra/specs/mac_quadra_630.html|url-status=live}}</ref><ref name="LEM630">{{Cite web|url=https://lowendmac.com/1994/quadra-630/|title=Quadra 630 &#124; Low End Mac|website=lowendmac.com|date=18 July 1994 |access-date=2022-06-20|archive-date=2022-06-20|archive-url=https://web.archive.org/web/20220620134854/https://lowendmac.com/1994/quadra-630/|url-status=live}}</ref>

|-
! rowspan=4 | Timetable
! Predecessor
<!--Q700-->| [[Macintosh IIci|IIci]]
<!--Q900-->| [[Macintosh IIfx|IIfx]]
<!--Q950-->| [[Macintosh Quadra 900|Quadra 900]]
<!--Q800-->| [[Macintosh Quadra 700|Quadra 700]]
<!--Q650-->| [[Macintosh IIvi|IIvi]]/[[Macintosh IIvx|vx]]
<!--Q610-->| [[Macintosh IIsi|IIsi]]
<!--Q660-->| None
<!--Q840-->| [[Macintosh Quadra 950|Quadra 950]] & [[Macintosh Quadra 800|Quadra 800]]
<!--Q605-->| [[Macintosh LC III|LC III]]
<!--Q630-->| [[Macintosh Quadra 610|Quadra 610]]

|-
! Released
| colspan=2 | October 21, 1991
<!--Q950-->| May 18, 1992
| colspan=2 | February 9, 1993
<!--Q610-->| February 10, 1993
| colspan=2 | July 29, 1993
<!--Q605-->| October 21, 1993
<!--Q630-->| July 15, 1994

|-
! Discontinued
<!--Q700-->| March 15, 1993
<!--Q900-->| May 18, 1992
<!--Q950-->| October 14, 1995
<!--Q800-->| March 14, 1994
<!--Q650-->| September 12, 1994
<!--Q610-->| July 18, 1994
<!--Q660-->| September 12, 1994
<!--Q840-->| July 18, 1994
<!--Q605-->| October 17, 1994
<!--Q630-->| October 5, 1995

|-
! Successor
<!--Q700-->| [[Macintosh Quadra 650|Centris 650]] & [[Macintosh Quadra 800|Quadra 800]]
<!--Q900-->| [[Macintosh Quadra 950|Quadra 950]]
<!--Q950-->| [[Power Macintosh 9500]]
<!--Q800-->| [[Macintosh Quadra 840AV|Quadra 840AV]] & [[Power Macintosh 8100]]
<!--Q650-->| [[Macintosh Quadra 630|Quadra 630]] & [[Power Macintosh 6100/60AV]]
<!--Q610-->| [[Macintosh Quadra 630|Quadra 630]] & [[Macintosh Quadra 660AV|Quadra 660AV]] & [[Power Macintosh 6100]]
<!--Q660-->| [[Power Macintosh 8100/80AV]]
<!--Q840-->| [[Power Macintosh 7100/66AV]] & [[Power Macintosh 8100/80AV]]
<!--Q605-->| [[Macintosh LC 520|LC 520]]
<!--Q630-->| [[Power Macintosh 6300]]

|-
! rowspan=3 | Model
! Marketing model no.
<!--Q700-->| M5921
<!--Q900-->| M4210
<!--Q950-->| M6710
<!--Q800-->| M1287
<!--Q650-->| M2107
<!--Q610-->| M2372
<!--Q660-->| M2691
<!--Q840-->| M9025
<!--Q605-->| M1821
<!--Q630-->| M3491

|-
! Model number
<!--Q700-->| M5920
<!--Q900-->| M4200
<!--Q950-->| M4300
<!--Q800-->| M1206
<!--Q650-->| M2118
<!--Q610-->| M2113
<!--Q660-->| M9040
<!--Q840-->| M9020
<!--Q605-->| M1476
<!--Q630-->| M3076

|-
! Gestalt ID
<!--Q700-->| 22
<!--Q900-->| 20
<!--Q950-->| 26
<!--Q800-->| 35
<!--Q650-->| 36
<!--Q610-->| 53
<!--Q660-->| 60
<!--Q840-->| 78
<!--Q605-->| 89
<!--Q630-->| 98

|-
! colspan=2 | Enclosure
| [[Macintosh IIcx]] tower/desktop
| colspan=2 | Mac Quadra 900 tower
| Mac Quadra 800 tower
| Mac IIvx desktop
| colspan=2 | Mac Centris 610 desktop
| Mac Quadra 800 tower
| Mac Quadra 605 desktop
| Mac Quadra 630 desktop

|-
! rowspan=3 | Performance
! [[Central processing unit|Processor]]
<!--Q700-->| 25&nbsp;MHz<br/>[[Motorola 68040]]<ref>{{Cite web |date=September 16, 2014 |title=Overclocking the Mac Quadra Series - Quadra 700 |url=http://lowendmac.com/2014/overclocking-the-mac-quadra-series/ |access-date=June 19, 2022 |archive-date=October 26, 2021 |archive-url=https://web.archive.org/web/20211026051348/https://lowendmac.com/2014/overclocking-the-mac-quadra-series/ |url-status=live }}</ref>
<!--Q900-->| 25&nbsp;MHz<br/>[[Motorola 68040]]
| colspan=3 | 33&nbsp;MHz<br/>[[Motorola 68040]]<br/>{{Gray|(25 MHz [[Motorola 68LC040]] or [[Motorola 68040|68040]] for Centris 650)}}
| colspan=2 | 25&nbsp;MHz<br/>[[Motorola 68040]]<br/>{{Gray|(20 MHz [[Motorola 68LC040]] for Centris 610)}}
<!--Q840-->| 40&nbsp;MHz<br/>[[Motorola 68040]]
<!--Q605-->| 25&nbsp;MHz<br/>[[Motorola 68LC040]]
<!--Q630-->| 33&nbsp;MHz<br/>[[Motorola 68040]]<br/>{{Gray|([[Motorola 68LC040]] for LC and Performa)}}

|-
! rowspan=2 | [[Random access memory|Memory]]
<!--Q700-->| 4 [[megabyte|MB]] {{Gray|(expandable to 68 MB)}}
<!--Q900-->| 4 MB {{Gray|(expandable to 256 MB)}}
<!--Q950-->| 8 MB {{Gray|(expandable to 256 MB)}}
<!--Q800-->| 8 MB {{Gray|(expandable to 136 MB)}}
<!--Q650-->| 4 MB {{Gray|(expandable to 132 MB)}}<br/>or 8 MB {{Gray|(expandable to 136 MB)}}
<!--Q610-->| 4 MB {{Gray|(expandable to 68 MB)}}
<!--Q660-->| 8 MB {{Gray|(expandable to 68 MB)}}
<!--Q840-->| 8 or 16 MB {{Gray|(expandable to 128 MB)}}
<!--Q605-->| 4 or 8 MB {{Gray|(expandable to 36 MB)}}
<!--Q630-->| 4 MB {{Gray|(expandable to 36 MB)}}

|-<!-- RAM type -->
<!--Q700-->| 4 x 80 ns 30-pin SIMM
| colspan=2 | 16 x 80 ns 30-pin SIMM
<!--Q800-->| 4 x 60 ns 72-pin SIMM
<!--Q650-->| 1 x 80 ns 72-pin SIMM
<!--Q610-->| 2 x 80 ns 72-pin SIMM
<!--Q660-->| 2 x 70 ns 72-pin SIMM
<!--Q840-->| 4 x 60 ns 72-pin SIMM
| colspan=2 | 1 x 80 ns 72-pin SIMM

|-
! colspan=2 | [[Video card]]
<!--Q700-->| 512 KB – 2 MB<br/>6 x 100 ns VRAM SIMM slots
<!--Q900-->| 1 MB – 2 MB<br/>6 x 100 ns VRAM SIMM slots
<!--Q950-->| 1 MB – 2MB<br/>4 x 80 ns VRAM SIMM slots
| colspan=2 | 512 KB – 1MB<br/>2 x 80 ns VRAM SIMM slots
<!--Q610-->| 512 KB – 1MB<br/>2 x 100 ns VRAM SIMM slots
<!--Q660-->| 1 MB<br/>1 x 80 ns VRAM SIMM slot
<!--Q840-->| 1 MB – 2 MB<br/>4 x 80 ns VRAM SIMM slots
<!--Q605-->| 512 KB – 1 MB<br/>2 x 80 ns VRAM SIMM slots
<!--Q630-->| 1 MB<br/>1 x 60 ns VRAM SIMM slot

|-
! rowspan=2 | Storage
! [[Hard drive]]
<!--Q700-->| 0, 80, 160 or 400 MB (SCSI)
<!--Q900-->| 0, 160 or 400 MB (SCSI)
<!--Q950-->| 230, 400 MB, or 1 GB (SCSI)
| colspan=2 | 230 or 500 MB (SCSI)
<!--Q610-->| 160 or 230 MB (SCSI)
<!--Q660-->| 230 or 500 MB (SCSI)
<!--Q840-->| 230, 500 MB, or 1 GB (SCSI)
<!--Q605-->| 80 or 160 MB (SCSI)
<!--Q630-->| 250 MB (IDE)

|-
! Optical drive
| colspan=2 | None
| colspan=6 | None<br/>{{Gray|(Optional 2x CD-ROM)}}
<!--Q605-->| None
<!--Q630-->| None<br/>{{Gray|(Optional 2x CD-ROM)}}

|-
! colspan=2 | Ports
| colspan=10 | 2 x ADB<br/>2 x DIN-8 RS-422<br/>SCSI DB-25

|-
! rowspan=2 | Operating system
! Minimum
<!--Q700-->| [[System 7|System 7.0.1]]<br/>[[A/UX]]
| colspan=2 | [[System 7|System 7.0.1]]
| colspan=6 | [[System 7|System 7.1]]
<!--Q630-->| [[System 7|System 7.1.2P]]

|-
! Maximum
<!--Q700-->| colspan="10" | [[Mac OS 8|Mac OS 8.1]]<br/>[[Mac OS 9|Mac OS 9.1]] (with PowerPC upgrade)

|}

==Timelines==
{{Timeline of Macintosh LC models}}

==See also==

* [[List of Macintosh models grouped by CPU type]]
* [[Timeline of Macintosh models]]

== Notes ==
{{Notelist}}

== References ==
{{reflist}}

==External links==
{{commons category|Macintosh Quadra}}
* [http://www.everymac.com/systems/apple/mac_quadra/ EveryMac.com - Macintosh Quadra series]
* [http://www.lowendmac.com/quadra/index.shtml Lowendmac.com - Centris/Quadra Index]

{{Apple hardware before 1998}}
{{Apple hardware}}

[[Category:Macintosh Quadra| ]]
[[Category:Computer-related introductions in 1991]]
[[Category:Products and services discontinued in 1995]]
[[Category:Discontinued Apple Inc. products]]