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.