HP Pavilion xt5377qv Laptop (2.66-GHz Pentium 4, 512 MB RAM, 40 GB Hard Drive, DVD/CD-RW Drive) Standard Memory 512 MB = 256 MB (removable) + 256 MB (removable) CPU Type 2.66GHz Intel Pentium 4 Upgrade up to a maximum of 1.0 GB Memory, the system has 2 sockets to install Memory, already with 512 MB = 256 MB + 256 MB standard Memory installed Memory Comments PC2100 DDR SDRAM SODIMMs For best Laptop performance use the maximum amount of allowed Memory per slot for your Laptop choose HP Pavilion xt5377qv Laptop