A-Tech 16GB Kit (4 x 4GB) Max RAM for Dell OptiPlex 980 (MT, DT, SFF) - DDR3 1333MHz PC3-10600 Non-ECC DIMM Memory Modules at Amazon.com
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Dell Optiplex 980 Small Form Factor Desktop w/ Intel Core i5 650@3.20GHz, 4GB DDR3 RAM, 250GB HDD and licensed Windows 7 Professional from a Microsoft Authorized Refurbisher : Amazon.ca: Electronics