So i recently got a gifted an old gateway and i plan on upgrading it. I have a 550 w PSU and a pretty good Graphics card. All i need now is RAM. I'm wondering if there are certain RAM for certain builds. I understand that DDR3 is the best but i'm not sure if there are specifications, or if any RAM would fit any MoBo. btw i plan on buying http://www.newegg.com/Product/Product.aspx?Item=N82E16820231277&cm_re=ram-_-20-231-277-_-Product and my MoBo is PCI Express.