Fully working, removed from a working system. The Kingston 8GB DDR4 2666MHz Laptop RAM is a high-quality memory module designed for laptops. With a total capacity of 8GB and a form factor of SO-DIMM, this RAM is perfect for enhancing the performance of your computer. It features a bus speed of PC4-21300 (DDR4-2666) and is ideal for users looking to upgrade their laptop's memory capacity. With reliable brand support from Kingston, this RAM module is a dependable choice for improving your computing experience.