I have a Gateway computer, picked it up dirt cheap, with a 300 watt power supply. The motherboard is a Foxconn (Bengal) RS780. I want to upgrade the power supply as I would like to put a better graphics card in, such as the GTX 580. My question is how can I determine the max power supply that the motherboard can handle? I would like to put something around 650 or more watt power supply in but don't want to buy anything until I'm sure of the max power the system can handle. I've tried to do some research already but haven't anything that answers my question. I know when selecting a power supply, besides the watts, I also need to keep in mind things such as if it will fit into the case and if the fan is positioned correctly. So can anyone here help?Thanks,EdEdit: Okay never mind I found the answer. I was under the impression that the restriction is on the max wattage the motherboard can handle. In fact the restriction is the pin type it can accept. In my case all I need to do is find a 24 pin power supply in the wattage I want.

Hi, Some video cards also require that you have a minimum of amps on the rails... Example: Evga GTX 460 requires 450 watts and 2 six pin connectors with 24 amps on the 12v rail. Also, I've read that a single rail power supply is better than multiple rails. I don't know why, but that is what I've read. Hope this helps. Howard

Never buy PSU cheap, if you intend to overclock at least. Read up on reviews on the PSUs that interest you. Bjorn