This is 512mb PC-2100 184 pin Dimm (Non ECC). Lifetime warranty with Kingston Can be used on the Pentium IV mainboards that support PC2100 184 Pin DDR Ram or your AMD Athlon System. DDR Ram PC-2100 184 pins Kingston Ram is Compatible with almost all motherboards that uses DDR ram-please go to www.kingston to check on the approved list of mainboards that uses the Ram. Industry standard memory work with Most motherboards :Asus, Abit, Acer, BioStar, EPoX, PCChips, BioStar, Intel, MicoStar, QDI, Tyan, SuperMicron and Tekram. Compability with most Industry standard desktop PC motherboard supporting PC2100 Check your manufacturer's specifications manual or computer manufacturer for compatibility requirements if you have any questions.