Fully Buffered DIMM (or
FB-DIMM) is a memory technology that can be used to increase reliability and density of memory systems. Conventionally, data lines from the
memory controller have to be connected to data lines in every
DRAM module, i.e. via
multidrop buses. As the memory width increases together with the access speed, the signal degrades at the interface between the bus and the device. This limits the speed and memory density, so FB-
DIMMs take a different approach to solve the problem.