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http://www.gadgetspeak.com/blog/detail.rhtm/678579/Selecting_the_Best_Power_Supply_Unit_for.html
Nov 29, 2012

Selecting the Best Power Supply Unit for Your PC 

Once you have the central processing unit, graphics card, mains cable, case and the motherboard that you want to use to assemble your computer. The next item you need to have is the power supply. Which one should you choose? What are you looking at when you select the given power supply unit (PSU)? Let us look at some of the aspects of the PSU that you need to keep in mind when looking for one.

What do you look for when looking for a PSU?
As a shopper who has little information on the PSU on the market, you may end up having a hard time selecting the best unit for your PC tower. You will be faced with many form factors, brands, connector types and other factors which may end up confusing you if you have no knowledge about what to look for. Some considerations are discussed below.


The Dimensions of the PSU and its form factor

Before you can consider anything else, you need to consider the size of the PSU that you need. You will be disappointed when you buy a PSU and find that it is small or too big for the slot provided. You need to be sure that the width, length and the height of your PSU fits in the case you have. You need to compare the replacement PSU with the one you have removed, or follow the manual that comes with the case so that you find out the specifications.

The standard ATX PSU dimensions usually range within 3.25" high, 6" long and 5.5" wide. The microATX PSU dimensions come in at 2.5" high x 5" long and 5" wide. The dimensions may change according to the dimensions of the manufacturer.

You need to match your form factor with the size of the PSU. You need to check out the way your case is laid out so that you can get the best case that will fit in the enclosure. If you are not sure about the form factor of your PC, you need to consult with your manufacturer guide.

Is the brand reliable?


You need to check into the history of the manufacturer so that you know how reliable the manufacturer's product is. You can check out the reviews of the product on different websites or review forums. Don't trust every review, but go with the problem that is coming up time and again.

Many manufacturers will certify units that are processed by a processor company. This will act as a reference for the dealer to show that the power supply meets the output and input quality of the manufacturer.

The type of connectors


The PSU unit you get needs to have a description of the type of connectors and how many they are. It also needs to have a specification of the power ratings on every rail. If you have a Pentium IV computer, you need to have a PSU with an extra 4 pin connector to provide adequate power supply to the unit.

What is the total deliverable power?


You need to target a PSU that has a maximum power rating that is higher than the drain from devices in the computer. This will allow for growth in case you decide to add another device in the unit.

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