Not all power supply units are equal
If you compare two power supply units with the same power rating. (For example marked as 400w ) you may be surprised to find they have completely different rating and specifications. When you look at the power supply unit detail spec. Some 400w power supply units may be less powerful than your old 300w unit. It is always better to go for bit bigger power supply than the minimum required. Keep in mind most modern processors, DVD Writer, Video cards are all power demanding more than ever. For example if you have a DVD Writer and a 256 meg or better video card going for a 500W or better ATX power supply is a must, even though you may be able to carry on with a 400W for the short term. One good news is the latest Core 2 Duo introduced by Intel in mid 2006 is bit of a power saver, consuming much less power than it's predecessors. Following guide will give some middle of the range power supply specifications. DC out put on each of the rails or outlets on typical ATX power supply
Higher the Amperage rating, better the unit. (20A is better than a 18A ). The power required will depend on the Processor as well as the number of drives (Hard drives, CD and DVD drives, Writers ), the video card and also other PCI cards you have on the system We see lot of power supply units in the industry and they are over-rated. They may fail under load and as well as may cause damage to other expensive parts of your computer. Also it is more likely that an over-rated power supply unit will pass on a spike in the mains supply than a good power supply. So remember when it comes to power supply units "Not all are created equal "
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