This Dell A1595856 compatible 2GB DDR3-1066MHz Dual Rank Unbuffered 1.5V 240-pin CL7 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 memory is built to strict JEDEC standards to meet or exceed the Tier 1 OEM's factory requirements. The products are also guaranteed by federal law to not affect or void OEM warranties.