I'm just about to start building my computer and there are a few things I'm not sure about. Should I install the graphics card on the motherboard straight away? I read in the manual that you need to disable the graphic chips on the motherboard first for it to work. How would I do that? Also, how do standoffs protect against short circuit if they are metal? One last thing, what the **** is a toroidal choke? do I need it? Cheers!