Apple iMac G5 PowerPC G5 2.1GHz 512MB 250GB DVD&plusmn;RW Radeon X600 XT 20" AirPort OS X w/Webcam & Bluetooth White color Mac OS X 10.4 pre-installed PowerPC G5 2.1 GHz processor 700 MHz front side bus, 512K L2 cache 512 MB DDR2 SDRAM (supports up to 2.5 GB)