SDRAM (Synchronous Dynamic Random Access Memory) is a step up from standard DRAM as it has the capability to alternate between two sets of data when retrieving information. By doing this the delay created when one address bank shuts down awaiting the next one to be opened is eliminated. The term 'synchronous' is used as the SDRAM is sychronised with the computers CPU bus's clock speed, so the faster the bus the faster SDRAM.