Your Sony Vaio PCG-4A1L supports a Maximum of 1GB of PC-2100 RAM. The standard configuration from the manufacturer for a Vaio PCG-4A1L has 256/512MB of RAM and has 2 bank(s) of memory socket(s) for a total 2 memory socket(s). Installing the largest capacity memory module in each memory socket will provide maximum system performance.
The above memory modules are made from Top Quality Components and backed by a Lifetime Warranty. If your memory should ever fail, Premium Memory will replace or fix the memory at no charge to you as long as you own the memory. We also provide Toll-Free Technical Support to help you if you ever have any questions about your Premium Memory.