Make your Dell Latitude C840 / C640 Notebook a champion by upgrading with memory specifically engineered and tested for your laptop. At Dell we focus on quality parts and rigorous testing so that your computer can tackle the challenges faced by high-end operating systems and multimedia applications. With Dell Memory we also offer a limited lifetime warranty* and the benefits of Dells award winning service and support. We know that you are focused on maximizing the total cost of your laptop, so we offer this enhanced performance at industry leading prices. Trust only Dell Memory for your next Dell system upgrade!