Make your Dell™ system a champion by upgrading with memory specifically engineered & tested for your system. At Dell we focus on quality parts & rigorous testing so that your system can tackle the challenges faced by high-end operating systems & multimedia applications. With Dell Memory we also offer a limited lifetime warranty & the benefits of Dell′s service & support. Trust only Dell Memory for your next Dell system upgrade! Dell™ Branded memory offered in the Memory Selector is fully compatible & 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. On a system configured with 4 GB of memory (RAM), Microsoft Windows will report 3.0 GB to 3.8 GB of available memory. This is normal for 32-bit versions of Windows (the most common versions). A 64-bit operating system (Microsoft Windows 64-bit version) is required to utilize 4GB or more of memory.