Hello i need help...The guy who building my kids pc just told me that one of 2 ddr3 doesnt work The motherboard gigabyte p55m-ud2 ,i5, memory corsair 2x2gb 1333, and also he installed windows 7. He said that he cant se in windows 4 gb and also that motherboard was making strange noice.I just bought those items to make a present for my kids and now a bit worry. Maybe he doing something wrong ? We are friends and i can tell him watever you suggest. Ty in advance.