512MB PC-3200 184pin DIMM internal memory module for the Apple computer systems shown in the table below. This unit is backwardly compatible with PC-2100 and PC-2700 memory i.e. it will work in any system capable of running PC-2100 or PC-2700 memory.
This is a used & tested part taken from a recycled Apple laptop.

Compatibility table
eMac	1.25GHz and 1.42GHz models only
iMac G5	1.6GHz, 1.8GHz and 2.0GHz models only
PowerMac G5	1.6GHz, 1.8GHz Dual 1.8GHz, Dual 2GHz, Dual 2.3GHz, Dual 2.5GHz & Dual 2.7GHz
PowerMac G4	Mirror door models only (Dual 867MHz, 1GHz, Dual 1GHz, Dual 1.25GHz & Dual 1.42GHz
Xserve G4	1GHz, Dual 1GHz, 1.33GHz & Dual 1.33GHz

Image shown is a generic memory DIMM, not specifically this model."