PC4200/533 MHz DDR2 240 pin DIMM
For 2005 'iSight' iMac G5 with PCI-Express Graphics
2005 Dual Core G5 with PCI-Express
Note: G5 Towers require RAM modules to be installed
in pairs.
Purchase modules in pairs, example: 1 GB upgrade is two 512MB Modules
You can install single module in iMac