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Topic Title: Power Supply Unit
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Created On: 03/26/2004 04:40 AM
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 03/26/2004 04:40 AM
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Joined: 11/02/2003

Comes in at various sizes and flavors.

AT - Had 2 separate power lines to the motherboard, a push button straight to the PSU for startup and shutdown, old tech, used in 486 and older.
ATX - A single line to the motherboard, use of APM and ACPI allowed for automatic startup and shutdown by motherboards control(timer, etc.), still used.
ATX12V - An extension to the ATX, an additional +12V/-12V line to help the Pentium IV power hunger, also used with Athlon 64. Can be found on some AXP boards for extra stability(if you have many fans etc.)
µATX - A smaller version of ATX, designed for small barebone computers.
Other PSU's used in small computers are SFF, SFX, PS/3 and FlexATX

When you think of a PSU, you think the more wattage the better it is, like one could think the more MHz or RAM is better. But once again, in the world of computers, this equation is far from true.

A cheap über 500W PSU could only produce 350W. A good 300W PSU could also be able to maintain a 350W current.

When purchasing a PSU, a customer always looks at the wattage, possible fans or just the fancy looks. Not the actual brand. As long as the brand is good, in the end you really don't need to look at the ampers the voltage rails can provide, a good PSU will have good voltage rails.
So when purchasing a PSU, remember to check brand too okay?

Tom's Hardware Comparison of 21 Power Supplies ' "> (One of the few good tests Tom has made)
SilentPCReview Power Supplies Section Article Index' ">
Takaman's Power Supply Calculator' ">
JS Custom PCs, LLC, Power Supply Wattage Calculator' ">
FiringSquad's Guide to Power Supplies' ">

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