2GB RAM Memory Upgrade for the IBM Lenovo Thinkpad T61 and T61p Series Notebook Laptops (DDR2-667, PC2-5300, SODIMM) Guaranteed Compatible for the IBM Lenovo Thinkpad T60 and T60p Series Notebook Laptops. This includes all T61 and T61p submodels (i.e. T61 7659-xxx). If you are unsure about your model or compatibility please give us a call! Speed up your system with up to 4.0GB of memory! Lifetime Replacement Warranty! Will ship the same day when ordered at or before 4pm EST! All others ship next day! Fully-staffed call center to help with installation or inquiries! Call 866-335-1355 with questions or for help!