This is a Smart IBM ThinkCentre Memory 512MB DDR2 1Rx8 PC2-4200U DIMM. The FRU number is 30R5121. This item is new and has never been used. It was originally made for use for an OEM as a part of a system. Even though it may have the same part number as a standard part this item may be configured specifically for the OEM that originally ordered it. We have re-packaged them for individual sale. It is being sold as pictured and does not come with any additional parts or accessories.