1. Compatibility & Connectors

What's the most important feature of a computer power supply? Well, its got to be its compatibility. Older motherboards will need a 20-pin ATX connector. Newer, more advanced motherboards will need the 24-pin ATX connector in a power supply.


2. Molex Connectors

If you look at a modern power supply in a PC, you will see it has many of those octopus-like connectors. Those are really 12V molex connectors and they hook up to peripherals like hard drives, CD and DVD-ROM drives and PC case fans. You need to make sure the number of molex connectors in your power supply is enough to meet the number of components in the PC.


3. SLI and CrossFire Technology

Ok, if you're one of those hardcore PC enthusiasts, you'll know that a new technology called SLI has come up in the PC industry.

What does SLI do? It allows you to combine the processing power and memory of two Nvidia video cards. There is an equivalent term called 'CrossFire' if you're using ATI video cards.

Think about that for a moment - we're talking about insane performance. If you intend to go the SLI path, then your power should be SLI Certified (if you are using Nvidia video cards) or ATI CrossFire Ready (if you are running ATI video).


4. Overrated Peak Wattage Numbers

One thing you should always know about purchasing power supplies is that the peak wattage is usually overstated. My advice is this - go for a higher wattage than you need. If you building a system, going for anything less than 400W is not a good idea.


5. Size Of The Power Supply

Another factor to consider is no doubt the size of the power supply unit you have. Most of the power supplies out there conform to the ATX specification. Make sure that your case is also in the ATX form factor if you are buying such a power supply.

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V.Vadivelan

There never a wrong time to do the right thing.

Thanks! A piece of good information. Will share it somewhere

This is a great post... The only thing you're missing is that you need to check the reputation. I had a powerful power supply made by thermaltake that died after a year. One day it just didn't start.. However, it had excellent stats on paper. 650 watts, tons of connectors, it should've been a god. Make sure you check reviews!