I am just curious. I bought a Gateway GT5660E desktop some time ago. Warranty is out and all. I have been using the on-board graphics. I want to put a new PCI-E x16 (I have the open slot for it) in but want to know if this is going to cause problems? I remember a long time ago some desktop PCs were impossible to upgrade yourself. If anyone can give me any tips or anything to look out for when doing this it would be appreciated. Thanks.