The AddOn HP 3TK85AA Compatible 4GB DDR4 - 2666MHz Unbuffered Single Rank x8 UDIMM is designed to enhance your computer's efficiency and speed. With a memory speed of 2666 MHz and a CAS latency of CL17, this 288 - pin DDR4 SDRAM module ensures quick access to data, making it ideal for gaming and heavy software applications. The unbuffered design and single - rank configuration provide reliable performance while minimizing power consumption. This memory module is built to strict JEDEC standards, ensuring compatibility and optimal performance for your system. It comes with a lifetime warranty, guaranteeing its durability and reliability.