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I want to fit a second drive but I only have one socket on the motherboard

Hi, Here is a link to the Owner’s manual for your desktop. Scroll down to p.103-104, it shows that there are 5 sata ports on the motherboard. (#3 + #6 on the motherboard layout) If you want to fit a 2nd HDD there are at least 3 spare ports available for you to use, if your current arrangement is only 1xHDD + 1xODD, unless you have more sata connected devices installed. http://downloads.dell.com/Manuals/all-pr

The Dell XPS 480 is the perfect computer for adding additional HDD’s. You can add up to 3 additional drives giving you loads more storage if required.