Memory modules that utilize temporary storage areas (known as
buffers) to help manage the data sent to the memory by the memory
controller. Buffers act as current regulators keeping the amount of
current flowing to and from the chips at optimal levels. The
purpose of this is to allow for more memory chips on modules by
keeping the memory from being overloaded by the chipset. It can
also be used to allow more modules to be used in the system. Not
all systems can use buffered memory; the type of memory required is
dependent upon the computer's memory controller.
Buffered memory is an older term for registered memory.
However, some new large systems use "fully buffered memory". In
normal registered/buffered memory only the control lines are
buffered, in fully buffered memory the data lines are buffered as
well.