4GB Upgrade for a Lenovo ThinkPad W500 Series System (DDR3 PC3-12800, Non-ECC, ) at Amazon.com
4GB Memory Upgrade RAM For Lenovo ThinkPad W500 Series at Amazon.com
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