Configurations	Single 1.8GHz SuperDrive	Dual 1.8GHz SuperDrive	Dual 2GHz SuperDrive	Dual 2.5GHz SuperDrive
Model	M9555LL/A	M9454LL/A	M9455LL/A	M9457LL/A
G5 Processor	Single 1.8GHz PowerPC G5	Dual 1.8GHz PowerPC G5	Dual 2GHz PowerPC G5	Dual 2.5GHz PowerPC G5
L2 Cache	512K per processor
Frontside bus	600MHz	900MHz per processor	1GHz per processor	1.25GHz per processor
DDR SDRAM memory	256MB PC3200 (400MHz) Supports up to 4GB		4.5GB PC3200 (400MHz) Upgraded from 512MB, supports up to 8GB
8X AGP Pro graphics	ATI RADEON 9600 XT with 128MB DDR SDRAM, DVI and ADC ports (Upgraded from NVIDIA GeForce FX 5200 Ultra with 64MB DDR SDRAM)
Hard drives	80GB Serial ATA; 7200 rpm		1 x 160GB Serial ATA; 7200 rpm 1 x 500GB Serial ATA; 7200 rpm
Optical drive	SuperDrive (DVD-R/CD-RW)
PCI slots	Three open full-length 33MHz, 64-bit PCI slots		Three open full-length PCI-X slots: one 133MHz, 64-bit slot and two 100MHz, 64-bit slots
Expansion	One FireWire 800 port, two FireWire 400 ports (one on front); three USB 2.0 ports (one on front), two USB 1.1 ports (on keyboard); AGP 8X Pro slot with graphics card installed
Bays	Two internal hard drive bays (occupied); one optical drive bay (occupied)
Networking	Built-in 10/100/1000BASE-T Ethernet and 56K V.92 modem
Wireless	AirPort Extreme ready (based on 802.11g specification; IEEE 802.11b Wi-Fi certified); Bluetooth option
Audio	Optical digital audio input, optical digital audio output, analog audio input, analog audio output, front headphone minijack and speaker
System software	Mac OS X, version 10.5.5 Panther (Upgraded from 10.3)
Software	iLife ’08 (includes iTunes, iPhoto, iMovie HD, iDVD, and GarageBand), Microsoft Office 2008 for Mac, OmniGraffle, OmniOutliner, QuickBooks for Mac New User Edition, Zinio Reader, Mail, iChat AV, Safari, Sherlock, Address Book, QuickTime, iSync, iCal, DVD Player, Classic environment, Xcode Developer Tools
Hardware accessories	Apple Keyboard, Apple Mouse, AirPort antenna
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