I'm building one good PC out of several old PCs for a [money-less] nonprofit museum. The best of the lot is a 6-year old Dell Studio XPS so I'm building on that. The best graphics card I have is an ATI Radeon X850 XT card (circa 2006) but I don't have the power supply adapter cable it requires. Does anyone have an idea where I can get one or even what it is so I can get parts and build one up?