4GB Memory RAM High Speed Upgrade for Lenovo ThinkPad T400 T500. at Amazon.com
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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memory - Lenovo Thinkpad 400 beeps after installing 2x4GB RAM - Super User