Full Details from Amazon.com : http://www.amazon.com/gp/product/B00CWH7IDG?tag=onigi-208GB (1x8GB) RAM Memory SODIMM Compatible with Dell XPS 15 (L502X) Notebooks DDR3204PIN SODIMM DDR3 SDRAM DDR3-PC10600 PC3-1333MHZ 1 SINGLE PC