Brand New HP 512MB DDR2-667 ECC MEMORY (1X512) XW4300 (HP DRAM Memory) -PV940ET-ABU: Storage Capacity-512 MB, Upgrade Type-System specific, Technology-DDR2 SDRAM, Form Factor- DIMM 240-pin, Data Integrity Check-ECC, Features-Unbuffered, Memory Speed- 667 MHz ( PC2-5300 ). A high-quality memory add-on for users who require increased performance and improved efficiency for running daily applications and tackling increasingly complex design or data simulation.