Add-On Computer AddOn 16GB DDR4 SDRAM Memory Module - For Desktop PC, Notebook, Computer - 16 GB (1 x 16GB) - DDR3-2666/PC3-21300 DDR4 SDRAM - 2666 MHz - CL17 - 1.20 V - Non-ECC - Unbuffered - 288-pin - DIMM - Lifetime Warranty

AddOn 16GB DDR4 SDRAM Memory Module - For Desktop PC, Notebook, Computer - 16 GB (1 x 16GB) - DDR3-2666/PC3-21300 DDR4 SDRAM - 2666 MHz - CL17 - 1.20 V - Non-ECC - Unbuffered - 288-pin - DIMM - Lifetime Warranty

This Lenovo® 4X70R38788 compatible 16GB DDR4-2666MHz dual rank x8 unbuffered 1.2V 288-pin CL17 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.