CMS 2GB (1X2GB) DDR3 8500 1066MHZ Non ECC SODIMM Memory Ram Upgrade Compatible with Lenovo® Thinkpad R400 7440, 7443, 7445, 7446, 7447 - A48 at Amazon.com
8GB (4GBx2) Team High Performance Memory RAM Upgrade For Lenovo ThinkPad R400 Series R500 Series Laptop. The Memory Kit comes with Life Time Warranty. at Amazon.com