I order ram from Newegg, or Crucial myself. If you don't already know what type of ram your machine takes find the manual and check. It is true that faster ram will work in a PC if the ram uses the same pin layout but I have had lowend motherboards that wouldn't work with some types of the cheap ram. One thing I always do when I get ram is run memtest86 to make sure it works with my motherbaord. I have never had a problem with ram from Crucial.