I have a dell dimension 8400 and i think it uses intel 925x. Not exactly sure becuase i went to a few different sites to find info. Anyways, I was wondering what processors i could upgrade it to or what would be compatible with it like quad cores or duo cores. Also im looking to add more ram and was wondering what kind of ram i could add. I think it uses DDR SDRAM. Can I add ram like pc 6400 ddr2 dual channel rams for that?