1GB RAM Memory Upgrade for the HP DV2550SE Laptop Notebook (DDR2-667, PC2-5300, SODIMM) Guaranteed Compatible for the HP DV2550SE Speed up your system with up to 2GB of memory! Lifetime Replacement Warranty! Will ship the same day when ordered at or before 4pm EST! All others ship next day! Fully-staffed call center to help with installation or inquiries! Call 866-335-1355 with questions or for help!