8GB (4GBx2) Team High Performance Memory RAM Upgrade For Lenovo ThinkPad T510 Series W500 Series Laptop. The Memory Kit comes with Life Time Warranty. at Amazon.com
Lenovo ThinkPad W Series W500 RAM Repair Guide | Installation Video
4GB DDR3 Memory RAM for Lenovo ThinkPad W500 2055 at Amazon.com
4GB Memory Upgrade RAM For Lenovo ThinkPad W500 Series at Amazon.com