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This Lenovo® 22P9272 compatible 1GB DDR-400MHz Dual Rank Unbuffered 2.5V 184-pin CL3 UDIMM is 100% guaranteed to be compatible with your system and to work right the first time. Adding additional memory is the best way to increase the performance of your system. All our memory is built to strict JEDEC standards to meet or exceed the Tier 1 OEM's factory requirements. Our products are also guaranteed by federal law to not affect or void OEM warranties.