Does the ThinkPad T60 support a maximum of 3 or 4GB RAM? - Quora
IBM Thinkpad T60 RAM Replacement - iFixit Repair Guide
4GB (2GBx2) Team High Performance Memory RAM Upgrade For Lenovo ThinkPad T60 Series (Type 8741) (Type 8742) Laptop. The Memory Kit comes with Life Time Warranty. at Amazon.com
IBM Thinkpad T60 RAM Replacement - iFixit Repair Guide