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. 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! 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. This product is compatible with the following systems: Power Edge C5220 Power Edge C8220 Power Edge C8220x Power Edge M420 Power Edge M520 Power Edge M620 Power Edge M915 Power Edge R210 II Power Edge R220 Power Edge R320 Power Edge R415 Power Edge R420 Power Edge R515 Power Edge R520 Power Edge R620 Power Edge R715 Power Edge R720 Power Edge R815 Poweredge T110 II Power Edge T20 Power Edge T320 Power Edge T420 Power Edge T620 Precision Work Station T1700