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According to Dell you can use 1600MHz memory in the 660S. You can probably use 1333MHz, but you should use 1600MHz in order to obtain maximum speed. PNY Brand Champion
Sorry, there was a problem. Please try again later.Hello, To answer your question no this is not compatible. This is laptop/notebook memory and you need desktop DDR3 1600mhz desktop memory modules for your system. PNY Brand Champion
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