Full Details on Amazon.com : http://www.amazon.com/gp/product/B00NG1VLDA?tag=tsukuyomi-204gb (1x4gb) Memory RAM for Dell Inspiron I15-3521 I15rvt-13333blk I15rv-954blk204PIN SODIMM DDR3 SDRAM DDR3-12800 DDR3-1600MHZ 1 SINGLE PC