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Apple Power Macintosh G4 400 (PCI) Specs

Identifiers: Power Mac G4 - PCI - M7631LL/A - PowerMac1,2 - M5183 - 1832

All Power Macintosh G4 Models | All 1999 Models | Dynamically Compare This Mac to Others

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Apple Power Mac G4The Apple Power Macintosh G4/400 (PCI Graphics), based on the Yikes! architecture, features a 400 MHz PowerPC 7400 (G4) processor with the AltiVec "Velocity Engine" vector processing unit and 1 MB of backside cache. It shipped configured with 64 MB of RAM, a 10 GB Ultra ATA/33 hard drive, a 32X CD-ROM drive, and an ATI Rage 128 graphics card with 16 MB of SDRAM.

On October 13, 1999, a mere two weeks after introduction -- due to Motorola's inability to provide sufficient numbers of PowerPC 7400 (G4) processors -- Apple quickly, and infamously, "reconfigured" or "speed dumped" this model -- replacing it with the Power Macintosh G4/350 (PCI Graphics), and introducing the Power Macintosh G4/400 (AGP Graphics) and a revised configuration of the Power Macintosh G4/450 (AGP Graphics).

The Power Macintosh G4/400 (PCI Graphics) uses a case design effectively the same as that introduced with the Power Macintosh G3 (Blue & White) -- complete with a fold down door on the side that makes upgrading very easy -- but is clad in a more conservative "graphite" and white color scheme. Custom configurations also were available.

To purchase or upgrade a G3 Mac -- as well as newer Macs -- see site sponsor OHS.


  • Tech Specs
  • Ports
  • Popular Q&As

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


August 31, 1999 October 13, 1999*
Details: The "Introduction Date" refers to the date a model was introduced via press release. The "Discontinued Date" generally refers to the date a model either was replaced by a subsequent system or production otherwise ended.

*The lifespan of this model was cut short by Motorola's inability to provide sufficient numbers of PowerPC 7400 (G4) processors, causing Apple to quickly, and infamously, "reconfigure" or "speed dump" this model -- replacing it with the Power Macintosh G4/350 (PCI Graphics), and introducing the Power Macintosh G4/400 (AGP Graphics) and a revised configuration of the Power Macintosh G4/450 (AGP Graphics).

Also see: All Macs introduced in 1999.
1 247
Details: This model only is compatible with the 32-bit Geekbench 2 benchmark. These numbers reflect an average of user provided 32-bit and 64-bit results as submitted to the Geekbench website. Higher numbers are better.

You also might be interested in reviewing all 32-bit Geekbench 2 user submissions for Macs with the PowerMac1,2 Model Identifier, which may include multiple models.

To dynamically compare Geekbench results from different Macs side-by-side, see EveryMac.com's Ultimate Mac Comparison.
400 MHz PowerPC 7400 (G4)
Details: The PowerPC G4 includes the AltiVec "Velocity Engine" vector processor.
ZIF Socket Integrated
Details: The Power Macintosh G4 (PCI Graphics) models have the processor mounted on a ZIF socket.
100 MHz 200 MHz
Details: This system has a 200 MHz backside bus and 1 MB of level 2 cache.
Open Firmware 1 MB
Details: Boot ROM and around 1 MB, other instructions are loaded into RAM (NewWorld).
64k 1 MB (backside)
Details: The 1 MB of backside cache has a 200 MHz bus.
PC100 SDRAM 100 MHz
Details: Officially supports 100 MHz PC100 SDRAM (3.3v, unbuffered, 64-bit-wide, 168-pin), but PC133 SDRAM is backwards compatible and may be used as well.
64 MB 1 GB
Details: Installed as a single 64 MB module. There is no performance advantage to installing memory modules in pairs.

Site sponsor Other World Computing sells memory -- as well as other upgrades -- for this Power Macintosh G4.

Also see: Actual Max RAM of All G3 & Later Macs.
None 4
Details: There is no performance advantage to installing memory modules in pairs.
Rage 128 SDRAM
Details: The ATI Rage 128 graphics card with 16 MB of SDRAM occupies a 66 MHz PCI slot.
16 MB 16 MB
Details: N/A
Single Display 1600x1200
Details: Apple advertised that this system can support "up to 1600 by 1200 pixel resolution at 32 bits per pixel (millions of colors) and up to 85-Hz refresh rate."
None N/A
Details: N/A
10 GB HDD 5400 RPM
Details: It also could be configured with up to three Ultra2 SCSI drives at the time of purchase as a build-to-order option.

In the US (and many other countries), site sponsor Other World Computing sells storage upgrades for this Power Mac G4.

Also see: SSD Compatibility Guide for All G3 & Later Macs.
3.5" (25.4 mm) Ultra ATA/33 (ATA-4)
Details: Can officially support two 3.5" Ultra ATA/33 hard drives or SSDs on the original bus (more drives can be supported with a third-party controller PCI card) -- drives larger than 128 GB are not natively supported. Ultra ATA/100 hard drives are backwards compatible with the Ultra ATA/33 standard.
32X CD-ROM None*
Details: The 32X CD-ROM drive uses a EIDE (ATA-3) bus. Optional 5X DVD-ROM or DVD-RAM drives were available build-to-order.

*By default, this model shipped without a disk drive, but it could be configured with an internal Zip 100 drive as a build-to-order option.
56k 10/100Base-T
Details: Internal modem and 10/100Base-T Ethernet standard.
None None
Details: N/A
2 (1.1) 2 (400)
Details: USB 1.1 ports share a single channel.
3 PCI* 5 3.5"
Details: *In the default configuration, this model has three open 33 MHz PCI slots and a 66 MHz PCI slot occupied by the graphics card.

It has five 3.5" drive bays (four are internal and intended for hard drives, and one is external and intended for a Zip 100 drive). By default, with a single drive installed, three internal 3.5" bays are free as is the external 3.5" bay. The system also has an external 5.25" drive bay occupied by the optical drive.
Apple USB Keyboard Apple USB Mouse
Details: N/A
Tower Power Mac G4 (Graphite)
Details:
M7631LL/A Power Mac G4 - PCI
Details: The Apple order number should be unique to this system.
M5183 (EMC 1832) PowerMac1,2
Details: Please note that these identifiers refer to more than one model.

Also see: All Macs with the M5183 Model Number, the 1832 EMC Number, and the PowerMac1,2 Model Identifier.

For more about these identifiers and how to locate them on each Mac, please refer to EveryMac.com's Mac Identification section.
3.6V Lithium N/A
Details: N/A
8.6 X 10.4.11
Details: This system cannot run versions of MacOS X more recent than 10.4.11.
Boot/Classic Mode Emulation Only
Details: This Power Macintosh G4 model is capable of booting Mac OS 9 and using Mac OS 9 applications within the Mac OS X "Classic" environment.

Site sponsor OHS specializes in heavily upgraded Macs capable of running both Mac OS X and Mac OS 9 applications.
17.0 x 8.9 x 18.4 30.0 lbs. (13.6 kg)
Details: In inches - height by width by depth, (43.2 cm, 22.6 cm, 46.7 cm).
US$1599 N/A
Details: Please note that on average the estimated current retail pricing of used systems is updated twice a year (please refer to the date on the bottom of the page for the date last updated).

Photo Credit: Apple Computer.


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 (VGA) None
Details: One 15-pin mini D-Sub VGA port.
None None
Details: N/A
None None
Details: N/A
2 (1.1) 2 (400)
Details: USB 1.1 ports share a single channel.
1 (RJ-11) 1 (RJ-45)
Details: 10/100Base-T Ethernet standard.
None None
Details: N/A
None 1
Details: Includes a single analog 16-bit stereo sound in jack.
1 None
Details: Includes a single rear mounted analog 16-bit stereo sound out jack.
1 N/A
Details: N/A
1 N/A
Details: 115V AC (90V to 132V AC) or 230V AC (180V to 264V AC). 200W maximum.

Ten of the most popular Q&As about the Power Macintosh G4 models follow.



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