Aizen Shisuke said:
My grandmother has an old motherboard and I've got two relatively new power supplies lying around. Hers just died so I tried to replace it with one of mine. But my power supplies only have 8-pin connectors. Could I just shove 4 of those in the slot or do I need a special cable?
If the PSUs only provide an 8-pin connector, then it should be two 4-pin connectors snapped together. Split the 8-pin into two 4-pin connectors and use only one of them.