The Sony PCG FR Series of laptops come in 14 different models. The computers come with between 256 MB and 512 MB of removable RAM. They have 2 memory card slots and are upgradable to 1 GB of total memory. Installing new memory is fast and easy. Replacement chips are used for repairs or upgrades. The personal laptop computers use non-registered, non-ECC, unbuffered RAM. Memory is sold in single chips or kits containing 2 chips.