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Apple Macintosh Quadra 900 Specs

All Macintosh Quadra Models | All 1991 Models | Dynamically Compare This Mac to Others


Apple Macintosh Quadra 900Promoted as "up to twice as fast as the Macintosh IIfx," the Apple Macintosh Quadra 900 features a 25 MHz 68040 processor, 4 MB of RAM, and either no hard drive (just a 1.44 MB floppy disk drive) or a floppy disk and a 160 MB or 400 MB hard drive in a gigantic tower case design.

Most notably, the Quadra 900 was the first Macintosh to come in a proper tower case and accordingly packed sixteen RAM slots, three drive bays, and five NuBus slots to offer numerous expansion options.

In the picture, the Quadra 900 is on the left and the Quadra 700 is on the right.


  • Tech Specs
  • Ports

Click on the category for related details. The most commonly needed info is "open" by default, but all info is important.


October 21, 1991 May 18, 1992
Details: The "Introduction Date" refers to the date a model was introduced via press release. The "Discontinued Date" refers to the date a model either was replaced by a subsequent system or production otherwise ended.

Also see: All Macs introduced in 1991.
25 MHz* 68040
Details: *The Macintosh Quadra 900 has a 32-bit processor and a 32-bit data path. Sometimes this model is designated as having a 50 MHz processor, since the clock input runs at 50 MHz. However, the processor itself is not "clock doubled," so technically it only is a 25 MHz processor.
Third-Party* Integrated
Details: *A variety of third-party processor upgrades and accelerators were available.
25 MHz N/A
Details: N/A
Macintosh ROM 1 MB
Details: N/A
8k N/A
Details: N/A
30-pin SIMM 80 ns
Details: N/A
4 MB 256 MB*
Details: *Apple officially supports 64 MB of RAM in this model, but third-parties have been able to upgrade it to 256 MB with sixteen 16 MB SIMMs.

Also see: Actual Max RAM of All G3 & Later Macs.
None 16*
Details: *Four identical RAM SIMMs must be installed in a group.
Dedicated* VRAM SIMM*
Details: *This model has four 80 ns VRAM SIMM slots.
1 MB* 2 MB*
Details: *1 MB of VRAM onboard. Four slots support 256k 80 ns VRAM SIMMs for a maximum total of as much as 2 MB of VRAM. 512k VRAM SIMMs can be installed, but four identical ones must be installed and the system can only use 256k of each SIMM.
Single Display* 512x384-1152x870*
Details: *By default, the Macintosh Quadra 900 only supports a single display, but a second one can be supported with the addition of a compatible NuBus video card. The onboard video can support 512x384 at 24-bit and 640x480, 832x624 and 1152x870 at 8-bit. With 2 MB of VRAM installed, it can support up to 832x624 at 24-bit and 1152x870 at 8-bit.
Single Display* Variable*
Details: *This model can support a second display with the addition of a video card. By default, it only supports a single display.
160 MB, 400 MB* SCSI
Details: *By default, this model is configured with either no hard drive, a 160 MB or 400 MB hard drive. All are SCSI.
None* 1.44 MB (Auto)
Details: *A front-facing 5.25" drive bay is designed to support a CD-ROM drive, but one was not installed by default.
None AAUI-15
Details: AAUI-15 Ethernet standard.
1 040 PDS, 5 NuBus* 2 (5.25")**
Details: *Three NuBus slots provide 15-watts of power and two provide 25-watts of power.

**If a hard drive is not installed, a third internal bay is available.
Tower Mac Quadra 900
Details: N/A
M4210LL/A* Macintosh Quadra 900
Details: *M4210LL/A refers to the configuration with just a floppy drive. Configured with a 160 MB hard drive, the order number is M4230LL/A.
M4200 20
Details: Please note that these identifiers commonly refer to multiple models.

Also see: All Macs with the M4200 Model Number and 20 Gestalt ID.

For more about identifiers and how to locate them on modern Macs, please refer to EveryMac.com's Mac Identification section.
3.6V Lithium N/A
Details: N/A
7.0.1 7.0.1-7.5.1, 7.5.3-8.1
Details: Earlier and later versions of the Macintosh System/Finder and Mac OS are not supported.
18.6 x 8.9 x 20.6 36.8 lbs (11.5 kg)
Details: In inches - height by width by depth, (47.2 cm, 22.6 cm, 52.3 cm).
US$7200, US$8500 N/A
Details: Photo Credit: Apple Computer, Inc (MacUser Advertisement).


Click on a category for additional details. The most commonly needed info is "open" by default, but all info is important. The icons correspond with the icons for each port on the computer.


1 (DB-15) None
Details: N/A
1 1 (DB-25)
Details: N/A
2 None
Details: Serial ports are marked by printer and modem icons.
None 1 (AAUI-15)
Details: AAUI-15 Ethernet standard.
None None
Details: N/A
1 (Omni) None
Details: N/A
1 (8-Bit Stereo) None
Details: N/A
1 (Lockable Front) None
Details: N/A
1 N/A
Details: 100V-240V AC, 50-60 Hz Frequency, 303 Max Watts.

Icon Credit: Apple Computer, Inc.

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