I have alienware x51 i5-2320 with 4 gb ram as stock. Now i want to upgrade G skill 4 GB DDR3 1333MHz F3-10666CL9S-4GBXL RIPJAWS with 2- 4GB separate ram means 8 gb in total. My question is as my system has only 2 ram slots will this two rams fit side by side or do i need to look for new ram? Please suggest.