Upgrade your Dell OptiPlex 390 Desktop with DDR3 memory - the quickest, easiest way to boost performance and speed! Adding extra memory is one of the most cost-effective ways to make your operating system and applications run faster and smoother for peak performance.TOP BRANDSGuaranteed brand-new stock from the best brands in the world, including Kingston, Samsung, Crucial, Micron and SK hynix. The brand you receive will depend on current market prices and available stock (images for illustration only).LIFETIME WARRANTYAll memory comes with a full Mr Memory Lifetime Warranty. This upgrade will NOT invalidate your system warranty.100% COMPATIBLEGuaranteed compatible with your Dell OptiPlex 390 Desktop and all operating systems. We always send the correct chipset, ranking, voltage and CAS la.