4GB RAM Memory for Lenovo ThinkPad T Series T510 (4314DDU) Black Diamond Memory Module DDR3 SO-DIMM 204pin PC3-8500 1066MHz Upgrade System Specific Memory - Newegg.com
8GB Kit (4GBx2) Upgrade for a Lenovo ThinkPad T510 Series System (DDR3 PC3-12800, Non-ECC, ) at Amazon.com