Umm, depends on the type of RAM. If it is DDR or SDRAM, sure, go for it. If it is RDRAM (Rambus), then absolutely not! Rambus ram requires matched pairs of identical RAM, and completely matching speeds, bit lengths, etc. If you have Rambus, please tell me now, so I can show you what to get, otherwise, just tell me what type you have and I will find it so fast, your head will spin.