To give you more info, I have a copy of window ultimate I'm planning to install. Since I already have the 3x4gb in there, I'm thinking maybe it's better to take out the extra one on the outside and add 2x8gb. Would that be a problem to have 2x4gb + 2x8gb. I know ideally I should change all 4 to match, but I don't want to mess with the 2 on the inside and void my warranty. While on the subject, does anyone have suggestion of Ram to recommend? Money isn't too much of an issue.