How to upgrade RAM in your Lenovo ThinkPad T490 | Windows Central
8GB (4GBx2) Team High Performance Memory RAM Upgrade For Lenovo ThinkPad T400 Series T410 Series Laptop. The Memory Kit comes with Life Time Warranty. at Amazon.com
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CMS 2GB (1X2GB) DDR3 8500 1066MHZ NON ECC SODIMM Memory Ram Upgrade Compatible with Lenovo® Thinkpad T400, T400S Notebook Series Ddr3-Pc1066 - A48 - Newegg.com