I have an old dell gx280 pentium 4 that I want to add a two-three more hard drives to. I have used the extra sata port and the extra sata power adapter. There is an open 3.5 bay and i could remove the floppy drive for another 3.5 bay. I will add a sata pci card to get more sata ports. However, I don't know how to power these 2-3 extra hdds. I would rather not buy a new psu. Is there an adapter that i can use to plug the spare power cords into the sata hdd? There is one spare power cord with a cap on it that says P4, one that says p6, and one that says p8. An image of the inside of the case is attached.