I'm thinking about upgrading to this board: (http://www.newegg.com/Product/Product.aspx?Item=N82E168...) so long as it fits my XPS 420 case/components. I know that Dell's are nearly impossible to upgrade, but I saw this board listed on the Dell website, so I am curious. I would like to use an SLI configuration in the near future. Please let me know if I can do this. Thanks!