A-Tech 16GB (2x8GB) RAM for Dell Inspiron 660, 660s | DDR3 1600MHz DIMM PC3-12800 240-Pin Non-ECC UDIMM Desktop Max Memory Upgrade Kit at Amazon.com
Restored Dell Inspiron 660-6987BK Desktop PC with Intel Core i5-3330 Processor, 8GB Memory, 23" Monitor, 1TB Hard Drive and Windows 8 Operating System (Refurbished) - Walmart.com