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What is RDRAM? Can I mix and match these modules with SDRAM?

RDRAM is Rambus Dynamic Random Access Memory.  It has a unique technology developed by Rambus, Inc.  These modules, also called RIMM, are extremely fast and use a narrow, high-bandwidth channel to transmit data at a much higher speed than SDRAM.  Motherboards are specifically designed to accept RIMMs so these modules cannot be mixed with SDRAM DIMMs.

You can easily identify if a module is a RIMM if it has an aluminum covering placed over the RAM chips.  This sheath acts as a heat sink to protect the chips from overheating.