Power supply burnout running 4 monitors?

The monitors have nothing to do with it, but if both video cards are dual heads (two connections) they can draw a lot of power. Number of drives and usb devices will also create demand that the base power supply was not designed to handle.

This would have nothing to do with what is being displayed, but rather the full load amps being drawn by the two video cards and the motherboard.

It is quite normal to have to upgrade the original power supply of a computer when installing just one, newer and more powerful video card. You are talking about two, dual port cards, which would draw a lot of power.

If you only have 10A of power coming from the power supply, that would only give you 120 watts of power on the 12 volt main bus. This is very little power to run even one video card.

You need to research the recommended power supply for the video cards, and double it, since you have two. Then add in the 200 to 400 watts required by the motherboard. The total you arrive at is the minimum power wattage of the power supply you should be using. Meet or exceed this wattage if possible. You will find that many online stores sell upgrade power supplies that will fit into the same space as the original OEM power supply. This should solve the burn out issue, and more importantly, prevent the possible damage of the video cards or motherboard when the power supply fails.

Too much load on the protector is going to cause the voltage to spike a lot on the output side, where it can not protect. This is highly likely to cause other equipment to fail. He should first upgrade his power supply in case the 2 cards are too much for the current one. Also he should get another surge protector. He IS overloading the one he has.

I see no reason why it shouldn't work fine. Now if it was the other way around, 6 amp running on a 4 amp power supply you might have a problem. The 12 volts is the most important thing involved here. (computer Technician.)