My 2.3 was introduced a little bit before the dual cores... so it's not that old, maybe in computer years but its still a VERY capable machine...

2.3 GHz dual 512/160 introduced 2005.04.27 at $2,499

replaced 2005.10.19 by Power Mac G5s with dual-core CPUs

requires Mac OS X 10.4 or later

CPU: 2.0/2.3/2.7 GHz PowerPC 970

bus: 1.0 GHz/1.15/1.35 GHz (half CPU speed)

performance:

Geekbench 2 (Leoapard): 2251 (2.7 GHz), 1906 (2.3 GHz), 1704 (2.0 GHz)

Geekbench 2 (Tiger): 2269 (2.7 GHz), 2066 (2.3 GHz), 1828 (2.0 GHz)

L2 cache: 512 KB on-chip L2 cache

L3 cache: none

RAM: 512 MB, expandable to 4 GB or 8 GB using pairs of 400 MHz PC3200 DDR RAM (4 RAM slots in 2.0 GHz model, 8 slots in faster ones)

Video: AGP 8x

2.0/2.3 GHz: ATI Radeon 9600

2.7 GHz: ATI Radeon 9650

ATI Radeon 9800 XT with 256 MB optional

VRAM: 128 MB (9600) or 256 MB (Radeon 9650)

hard drive: 160/250 Serial ATA 7200 rpm

16x SuperDrive standard on all models

3 33 MHz 64-bit PCI slots on 2.0 GHz model

3 64-bit PCI-X slots on faster models (two 100 MHz, one 133 MHz)

internal 56k v.92 modem, optional

microphone: standard 3.5mm minijack, compatible with line-level input, not compatible with Apple's PlainTalk microphone

FireWire: 2 FW400 ports (1 on front), 1 FW800 port

USB: 3 USB 2.0 ports (1 on front)

ethernet: 10/100/gigabit

WiFi: antenna and connector for 802.11g AirPort Extreme card

Bluetooth: built in, optional antenna

PRAM battery: 3V CR2032 lithium

size (HxWxD): 20.1" x 8.1" x 18.7" (51.1 x 20.6 x 47.5 cm)

weight: 39.2 lb. (17.8 kg)

Gestalt ID: n/a

PRAM battery: 3.6V half-AA

Part no.: M9747 (2.0 GHz), M9748 (2.3 GHz), M9749 (2.7 GHz)