Full Details from Amazon.com : http://www.amazon.com/gp/product/B00B4G8A9C?tag=onigi-20<br /><br />4GB DDR3 Memory Upgrade for Dell Inspiron 660s PC3-12800 240 pin 1600MHz Desktop RAM (PARTS-QUICK<br /><br />4GB PC3-12800 DDR3 1600MHz 240 pin for Dell Inspiron 660s <br />Capacity 4GB <br />Speed PC3-12800 DDR3 1600MHz <br />Form Factor 240 pin DIMM <br />Halogen Free ROHS Warranty Lifetime
