2GB DDR2-800 (PC2-6400) RAM Memory Upgrade for the Dell Precision T3400 64-Bit 2GB DDR2-800 PC2-6400 Non-ECC Unbuffered 240 Pin 1.8V CL=6 Memory 128X8 When you purchase RAM from 4AllDeals, it comes with a lifetime warranty, as well as lifetime telephone technical support from our US-based technicians. PLEASE NOTE* If you do not purchase this module from 4AllDeals direct, you do not get the lifetime warranty or tech support offered in this ad. Put your trust in a company that has been in business for 12 years, not some fly by night seller you won't be able to get ahold of! 100% Guaranteed Compatible for the computer listed in the title of this ad This module is an ECC module, which often must be installed in matched pairs. Please check your system to ensure that you can use a single module, or purchase in even numbers.