SimpleTech S512M3RHA1 512MB PC2700 ECC DDR 184pin DIMM Viable alternative to the OEM part 400313-B21 Twice as fast as standard SDRAM memory Delivers a wicked fast gaming experience and enhanced performance for all advanced computer processing Maintains a transfer rate of up to 2.7GB of data per second Highest quality assurance rating available - ISO9001 Certified