i have a pci-express graphics card that requires a 6-pin pci-express connector. however, my power supply doesnt have this connectr. so i acquired a molex to pci-express thingamabob. it has 2 molex plugs. do have to plug both in? if i use an additional thingy that makes one molex connecotr into 2, and then i hook those 2 it just made instead of one into the pci-express adapter will i be defeating the purpose of the pci-express adapter having 2 molex plugs. does it do that because it needs double the power or what?