The Kingston KTA-G4133/512 SDRAM Apple Power Mac G4 Vintage Memory Modules are a set of six DIMM memory modules with a total capacity of 512 MB each. These modules are designed for vintage Apple Power Mac G4 computers and feature ECC memory for enhanced error correction. With a bus speed of PC-133, they offer reliable performance for older Mac systems. Backed by a lifetime manufacturer warranty, these Kingston memory modules are a valuable upgrade option for users looking to increase the memory capacity of their vintage Mac computer.