Dell? Branded memory offered in the Memory Selector is fully compatible and supported by Dell. Memory offered now may differ in speed from the original system memory but has been qualified to work in the system. When mixed, the memory will perform at the lowest speed populated or the highest speed allowed by the system. Make your Dell? system a champion by upgrading with memory specifically engineered and tested for your system. At Dell we focus on quality parts and rigorous testing so that your system 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 Dell?s service and support. Trust only Dell Memory for your next Dell system upgrade!