An important tip from one of our users: don't just check total power output, find out what you need in the way of current on each power rail. If you need 20 A on your +12V rails and the supply only has 15A, it doesn't matter how many watts the supply puts out: don't buy it. Make certain that you have ENOUGH rails, too: sometimes, you need more than just two +12V rails for your setup.
Replacing an existing power supply is easier: just get a replacement that meets or exceeds the specifications of the old one. (You can usually find those printed on the side of the supply.)
That said, here's a power supply that is compatible with most ATX format motherboards, puts out 500 watts of power (see specifications for exact distribution). Could this be your next power supply?
- ATX12V v2.0 CompatibleCompatible with the ATX12V v2.0 standard, the Antec earthwatts EA500 provides maximum power stability to drive the latest Intel and AMD processors as well as other system components.
- 500W Maximum PowerThe Antec Earthwatts EA500 power supply provides a maximum power of 500W to deliver safe, reliable output for high-end computer systems.
- Efficient CoolingThe Antec Earthwatts EA500 is equipped with a low-noise 80mm fan to provide highly efficient cooling for the power supply and the whole system while remaining quiet operation.
- 80 Plus CertifiedThe 80 PLUS certified power supply provides high power efficiency of at least 80% at any load between 20% and 100%, saving your money on your electrical bill, reducing heat in your computer's system and prolonging its life.