I have an alienware m15x 1333mhz ram at 2*2 Gb sticks, so 4 Gbs total. It is 204 pin ram the fell tech would not tell me much more than that and Im unreadable to 2 4Gb sticks because i only have four slots. Here are thru exact specs of the memory can be found here http://search.dell.com/results.aspx?s=dhs&c=us&l=en&cs=19&k=A3132535&cat=all
if this link dost work just go to dell.com and search for part number A3132535. Thank you all for your time and help.