I have a computer that I want to find out its graphics capabilities without looking up on the internet my specific model of computer. I want to attain this skill and find out whether any of my computers has the capability of a dual slot card as I cannot tell if it is able to house one. I also want to know what a power connector for a GPU looks like. I already know that if I have a 300w PSU it cannot hold a 350w GPU, but that is pretty much all I know about GPU upgrades. Thanks for any help!