Check http://www.Crucial.c

Check http://www.Crucial.com for ram, it will inspect your system and give you some options, they buy it at hrrp://www.BHPhotoVideo.com or just check out B & H photo video if you know what you need, Ram is getting cheaper by the day. I got an additional 8 gig of ram from B & H for under $150 for a Mac no less, PC should be less expensive.