I am looking into upgrading the RAM in my current system. Right now it has two of these: Nanya Technology DDR2-SDRAM PC4300 - 256 MBytes Looking to replace them with either of these: http://www.newegg.com/Product/Product.asp?Item=N82E16820227047 http://www.newegg.com/Product/Product.asp?Item=N82E16820144336 (when they are back in stock) The computer is a Dell Dimension 9150 with Pentium D. The first link is PC2 5300 and the 2nd is PC 4300. Is it possible to upgrade like that? I've never upgraded RAM before, so what else do I need to know? Looking to upgrade to 2GB, so I'm also open to any other suggestions.