Compaq Presario 18XL580 can be upgraded to a maximum memory of
320 MB , this system has 1 socket to install
Memory and comes already installed with 192 MB = (128 MB removable + 64 MB non-removable) of standard Memory. Compaq Presario 18XL580 takes PC100 SDRAM SODIMMs . You may choose the following Memory Upgrades.