AddOn AA2133D4SR8S/4G x1 JEDEC Standard 4GB DDR4-2133MHz Unbuffered Single Rank x8 1.2V 260-pin CL15 SODIMMThis Industry Standard 4GB DDR4 2133MHz Single Rank Unbuffered 1. 2V 260 pin CL15 SODIMM 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. 4