Power supply physical dimensions

  cyberphobic 22:10 17 May 2009

I am refurbing an old desktop PC which I was given, but the PSU is dead so I am looking for a replacement. The case is micro ATX, so a standard ATX PSU won't fit. I need a PSU which is the same cross section as an ATX PSU (150MM wide by 85MM high) but instead of being 140MM deep like most ATX cases, I need a PSU which is only 90MM deep. can anyoner point me in the right direction with this? As far as I can see micro ATX PSUs are smaller than this, is there a special term for this size which I should be looking for?

  Fruit Bat /\0/\ 22:19 17 May 2009

If renewing a PSU check:

1. The physical size of your PSU, some are hard to replace due to being a non standard size.
2. The amount of power need from the PSU don't skimp.
3 The correct connections for your equipment

1. Physical Dimensions

Besides the specs and form factors, the physical dimensions are also important factors in selecting a compatible power supply. Here is an outline of the physical dimensions of most standard power supplies:

# ATX: 6x3.5x5.5", HxWxD. Most common. Uses 4 mounting screws.
# Mini-ATX: 5x3.5x5", HxWxD. Rare size. Uses 4 mounting screws. Can be used in a regular ATX case, but often not the other way around.
# MicroATX: 5x3x4", HxWxD. Use 3 mounting screws. Not interchangeable with ATX or miniATX.
# Flex ATX: Even smaller than Micro ATX. Various sizes according to case specs; often not interchangeable.

Use the data above to determine if a particular power supply would fit your case.

The quality of a power supply can be estimated by its weight. While this is not a true scientific or thorough measurement of the power supply reliability, it is nevertheless a very simple and easy way for ordinary PC users to estimate and compare the quality of a power supply. Why weight matters click here

2. Power supply calculator click here

3. Correct connections
Some boards have 20 pin connectors others 24 pin
There is often a 4 pin plug required to power Intel CPUs
Molex D plugs for IDE HDD and CD/DVD drives
SATA power connections for latest HDDs and DVD drives.

Guide to changing PSU
click here
click here

  Technotiger 22:23 17 May 2009

You could start your search here ...

click here

  phono 22:24 17 May 2009

You may find it easier, and cheaper, to buy a new standard ATX case and PSU.

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