Apple Power Mac G4 dual processors

Model 867MHz, Model 1GHz, Model 1.25GHz

The all-new Power Mac G4 features features the dual processors providing increased memory bandwidth and faster data transfer. No matter which speed you choose, you'll get the staggering performance of dual processors at 867MHz, 1GHz or 1.25GHz, which adds 500MHz to the previous generation of Power Mac G4.
The original single processor 500MHz Power Mac G4 had a measured peak performance of 3.7 gigaflops. Power Mac performance has increased fivefold since then. In other words, you'd need five of the original Power Mac G4 systems to get the processing power available in the new Power Mac G4.

The dual 1.25GHz PowerPC G4 processors perform 18 billion floating-point operations per second, or 18 gigaflops. The 1.25GHz G4 runs professional applications like Adobe Photoshop up to 90 percent faster than a 2.53GHz Pentium 4-based PC. To harness all this power required the new system controller designed for Xserve as well as its L3 cache and DDR memory.
The processor speed gets an additional boost with an advanced cache memory architecture that provides ultrafast, dedicated memory. While accessing data from main memory is significantly faster than accessing data from the hard drive, all three new Power Mac G4s get an even faster level of memory called L3 cache.

The L3 cache boosts processor function by providing fast access to data and application code at speeds of up to 4 gigabytes per second. The dual 1.25GHz model uses 2MB of high-speed DDR SRAM running at up to 500MHz on each of its chips, while the dual 867MHz and 1GHz models offer up 1MB DDR SDRAM on each of their chips.
New Power Mac G4 systems feature Double Data Rate synchronous dynamic random access memory, also known as DDR SDRAM main memory. DDR SDRAM allows the system to read and write data to and from memory on both the rising and falling edge of each clock cycle. This provides twice the throughput of Single Data Rate SDRAM, which reads and writes only on the rising edge of the clock cycle. The resulting throughput between main memory and the system controller is 2.7GBps, more than double the throughput of the previous dual 1GHz Power Mac G4.

Graphics processors and dual display support across the product line. AGP 4X graphics slot suuport
NVIDIA GeForce4 MX graphics card (with 32MB of DDR SDRAM) Model 867MHz, ATI Radeon 9000 Pro graphics card (64MB of DDR SDRAM, quad-pipe architecture) Model 1GHz, Model 1.25GHz. As a build-to-order option you can get the NVIDIA GeForce4 Ti graphics card and its 128MB frame buffer of DDR SDRAM, which lets it perform 1.23 trillion operations per second. Each card comes with both ADC and DVI connectors for dual monitor support, without an extra PCI card.
Apple Display Connector (ADC). Available to connect: 23-inch (1920-by-1200-pixel resolution) Apple Cinema HD Display, the 22-inch Apple Cinema Display, or the 15-inch or 17-inch Apple Studio Display.

You also get the benefit of built-in Gigabit Ethernet for shooting large files across your LAN at high speeds, 56K modem, AirPort Card slot, two 400Mbps FireWire ports and four USB ports (two on the computer, two on the keyboard). Incidentally, FireWire, PCI expansion (four full-length 64-bit, 33MHz PCI slots with 215MB per second throughput) and Gigabit Ethernet are integrated directly into the main system controller, reducing latencies and providing superior I/O performance.

In fornt a vailable optical bay for
Combo DVD / CD-RW or/and SuperDrive (DVD-R / CD-RW)
The dual 1GHz and 1.25GHz models come with SuperDrive, while the dual 867MHz offers the Combo DVD/CD-RW drive. Available space for a second optical drive.
Data archiving on CD and DVD
Optical discs are ideal for backup because they offer huge capacity in a small package that's both easy to store and lasts a long time. CDs can hold up to 650MB of data, more than 450 times as much as a floppy disk. DVDs can store 4.7GB of data, the equivalent of about 18 Zip 250 disks or 3200 floppy disks.
SuperDrive-equipped Power Mac G4 lets you read and burn both CDs and DVDs that can be played in most consumer DVD players. The SuperDrive (DVD-R/CD-RW) reads DVD titles at 6x (7.8 megabytes per second), and writes to 4.7-gigabyte DVD-R discs at 2x (2.6 megabytes per second). The SuperDrive also reads CDs at 24x, writes to CD-R at 8x, and writes to CD-RW at 4x. It supports DVD-Video, DVD-ROM and DVD-R, as well as CD-ROM, CD-Audio, CD-R, CD-RW, CDI, CD Bridge, CD Extended, CD Mixed Mode and Photo CD media.
All SuperDrive equipped Macs are compatible with all currently shipping 1x and 2x DVD-R media, new higher speed media will become available later (2002/2003). It is important that your SuperDrive be up to date before using this new media.
Using new high-speed media
The DVD Forum recently released specifications for new high-speed discs for DVD recording (4x for DVD-R and 2x for DVD-RW). All SuperDrive equipped Macs can easily be updated to be compatible with this new media. Apple is providing a quick and easy way for customers to update their SuperDrive before this new media becomes widely available. This update is available as an automatic update and as a manual update for both Mac OS 9 and Mac OS X.

The Power Mac G4 also features dual ATA interfaces, one Ultra ATA/100 and one Ultra ATA/66, and you can put two drives on each interface for a total of four internal hard drives. (Or add a SCSI PCI card and mix and match for a total of four drives)

Technical Specifications

Processing and memory

Dual 867MHz, 1GHz or 1.25GHz PowerPC G4 processors

Velocity Engine vector processing unit

Full 128-bit internal memory data paths

Powerful floating-point unit supporting single-cycle, double-precision calculations

Data stream prefetching operations supporting four simultaneous 32-bit data streams

256K on-chip L2 cache running at processor speed

Up to 2MB DDR SRAM L3 cache per processor, with up to 4.6GBps throughput

Up to 167MHz system bus supporting over 1.3GBps data throughput

256MB or 512MB of PC2100 or PC2700 DDR SDRAM main memory supporting up to 2.7GBps throughput

Four DIMM slots supporting up to 2GB of DDR SDRAM using one of the following:
256MB DIMMs (64-bit-wide, 128-Mbit) ,
512MB DIMMs (64-bit-wide, 256-Mbit)

Graphics and display support

One of the following graphics cards installed in a dedicated AGP 4X graphics slot:
-NVIDIA GeForce4 MX graphics card with 32MB of DDR SDRAM ,
-ATI Radeon 9000 Pro graphics card with 64MB of DDR SDRAM ,
- NVIDIA GeForce4 Ti graphics card with 128MB of DDR SDRAM (build-to-order option)

Support for digital resolutions up to 1920 by 1200 pixels and analog resolutions up to 1600 by 1200 pixels

ADC and DVI connectors; DVI to VGA adapter included

Dual display support for extended desktop and video mirroring modes

Support for up to two Apple displays (second Apple flat-panel display requires the Apple DVI to ADC Adapter, sold separately)


10/100/1000BASE-T Ethernet connector (RJ-45)

Built-in antennas and card slot for optional 11Mbps AirPort Card; IEEE 802.11b compliant (Wireless Internet access requires AirPort Card, AirPort Base Station, and Internet access -fees may apply-. Some ISPs are not currently compatible with AirPort. Range may vary with site conditions)

Built-in 56K v.92 modem (Appropriate ISP and telephone services required. Your ISP may not support all v.92 features. Modem will function according to v.90 standards if v.92 services are not available. Actual modem speeds lower; speed depends on connection rate and other factors)

Storage and expansion

Four 3.5-inch hard drive expansion bays:
- One 7200-rpm Ultra ATA drive preinstalled on standard configurations: 60GB, 80GB, or 120GB,
- Support for up to four internal ATA drives (two Ultra ATA/100 and two Ultra ATA/66),
- Support for up to four internal SCSI drives (requires PCI SCSI card, sold separately),
-Support for a combination of internal SCSI and ATA drives (total of four)

One of the following optical drives:

-SuperDrive (DVD-R/CD-RW); writes DVD-R discs at 2x speed, reads DVDs at 6x speed, writesCD-R discs at 8x speed, writes CD-RW discs at 4x speed, reads CDs at 24x speed
- Combo drive (DVD-ROM/CD-RW); reads DVDs at 8x speed, writes CD-R discs at 16x speed, writes CD-RW discs at 10x speed, reads CDs at 32x speed
-Optional Combo drive in second optical drive bay

Four open full-length 64-bit, 33MHz PCI slots

One AGP 4X slot with graphics card installed

Peripherals and audio

Two 400Mbps FireWire ports (15W total power) (Actual rates will vary)

Four USB ports (two on system, two on keyboard)

Front headphone jack

Built-in speaker

Stereo audio line in and line out minijacks

Apple speaker minijack for connection to optional Apple Pro Speakers

Electrical and environmental requirements

Line voltage: 100V-125V AC or 200V-240V AC

Frequency: 50Hz to 60Hz, single phase

Maximum current: 6.5A (lowvoltage range) or 7.5A (high voltage range)

Operating temperature: 50° to 95° F (10° to 35° C)

Storage temperature: -40° to 116° F (-40° to 47° C)

Relative humidity: 5% to 95% noncondensing

Maximum altitude: 10,000 feet

Size and weight

Height: 17.0 inches (43.2 cm)

Width: 8.9 inches (22.7 cm)

Depth: 18.4 inches (46.8 cm)

Weight: 42 pounds (19.1 kg)(8)

Available Configurations

Dual 867MHz
PowerPC G4
Dual 1GHz
PowerPC G4
Dual 1.25GHz
PowerPC G4


Dual 867MHz PowerPC G4
Dual 1GHz PowerPC G4
Dual 1.25GHz PowerPC G4

L3 cache

1MB DDR SRAM per processor
1MB DDR SRAM per processor
2MB DDR SRAM per processor

System bus


Memory (2GB maximum)

256MB PC2100 266MHz DDR SDRAM
256MB PC2700 333MHz DDR SDRAM
512MB PC2700 333MHz DDR SDRAM

Hard disk drive

60GB Ultra ATA/100; 7200 rpm
80GB Ultra ATA/100;7200 rpm
120GB Ultra ATA/100; 7200 rpm

Optical drive

SuperDrive (DVD-R/CD-RW)
SuperDrive (DVD-R/CD-RW)

Graphics support

NVIDIA GeForce4 MX with 32MB of DDR SDRAM
ATI Radeon 9000 Pro with 64MB of DDR SDRAM
ATI Radeon 9000 Pro with 64MB of DDR SDRAM

Us $



867MHz PowerPC G4

256K L2 cache and 1MB L3 cache/processor

133MHz System Bus


60GB Ultra ATA drive

Combo drive (DVD/CD-RW)


56K internal modem


Dual 1GHz PowerPC G4

256K L2 cache and 1MB L3 cache/processor

167MHz System Bus


80GB Ultra ATA drive

SuperDrive (DVD-R/CD-RW)

ATI Radeon 9000 Pro

56K internal modem


Dual 1.25GHz PowerPC G4

256K L2 cache

& 2MB L3 cache/processor

167MHz System Bus


20GB Ultra ATA drive

SuperDrive (DVD-R/CD-RW)

ATI Radeon 9000 Pro

56K internal modem

Us $



Dual 1.25GHz
PowerPC G4
build-to-order option


Dual 1.25GHz PowerPC G4

256K L2 cache and 2MB L3 cache/processor

167MHz System Bus


120GB Ultra ATA drive

SuperDrive & Combo drive

NVIDIA GeForce4 Titanium

56K internal modem

Expansion slots and bays

Four open 64-bit, 33MHz PCI slots; AGP 4X slot with graphics card installed; four internal hard drive bays (one occupied); two optical drive bays (one occupied)


Two FireWire, four USB, front headphone minijack and speaker, rear Apple speaker minijack, audio line in, audio line out, ADC and DVI connectors


Built-in 100/100/1000BASE-T Ethernet and v.92 56K modem(6); AirPort ready(5)

System software

Mac OS X v10.2, Mac OS 9.2


QuickTime, iChat, iMovie, iPhoto, iTunes, iDVD (requires SuperDrive), DVD Player, Mac OS X Mail, Microsoft Internet Explorer, EarthLink, Acrobat Reader, Art Director's Toolkit, FAXstf, FileMaker Pro Trial, Graphic Converter, OmniGraffle, OmniOutliner, PixelNhance, Snapz Pro, Developer Tools

Hardware accessories

All models include Apple Pro Keyboard, Apple Pro Mouse, DVI to VGA adapter, modem cable

Build-to-Order Displays

Apple available:
Apple Studio Display (15-inch flat panel) M7928ZM/A
Apple Studio Display (17-inch flat panel) M7649ZM/A
Apple Cinema Display (22-inch flat panel) M8058ZM/A
Apple Cinema HD Display (23-inch flat panel) M8661ZM/A

advanced technologic sound magazine
2003 january issue 110

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