Sony VAIO PCV MXS Series Computers come standard with 512 MB of removable memory. The computers can hold a maximum of 512 MB, and replacement memory is readily available at an affordable price. The computers have 2 memory slots, and each slot holds up to 256 MB of RAM for a total system load of 512 MB. Replacement memory is available in 64 MB, 128 MB and 256 MB chips. Memory chips are easy to install and simply plug into the memory slot.