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You can look up the specifications of these products on Compaq's website.  Note: On refurbished products, the first character in the Compaq Part Numbers in this list have been replaced with an Alpha Character.   Number 1 becomes A, 2 becomes B, 3 becomes C .   For example the spec sheet for  Item A79804-007 can be found on www.compaq.com as 179804 .  Item c14890-b21 can be found on www.compaq.com as 314890-b21