Micron 1GB 533MHz DDR2 SODIMM Notebook Memory EE687A 374663-631 Micron P/N MT16HTF12864HY-53EB3, Get improved performance: DDR II memory modules use the latest memory architecture and have flexible bandwidth up to 8.5GB/s; and the new memory controller supports dual channel memory capability1 Work on several applications simultaneously and enhance your ability to access larger files. Install easily with the instructions tailored for your machine Depend on HP memory upgrade kits, which have been qualified and tested in HP Pavilion and Compaq Presario notebook PCs Compatibility: HP Pavilion zd8000 notebooks, dv4217cl, dv4223cl, dv4250ca, dv4253us, dv4269us, dv4270ca, dv4270us, dv4272us, dv4275nr, configurable dv4000 units ordered on 9/28/05 or later; Compaq Presario X6000 notebooks, V4220NR, V4240US, V4245US, and configurable V4000 units ordered on 9/28/05 or later