Replacing a power unit

  Newuser3605 22:54 09 Dec 11

Is it ok to replace a 480w power unit with a 550W one?

  rdave13 23:14 09 Dec 11

Yes but make sure of the dimentions of the new PSU so that it will fit in your PC.

  robin_x 23:16 09 Dec 11

Yes. Larger is fine.

They can supply up to their Wattage.

You wouldn't use a 200W PSU for a 250W PC, for example.

  Fruit Bat /\0/\ 10:31 10 Dec 11

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

2. Power supply calculator

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.

  Newuser3605 12:54 11 Dec 11

Many thanks for the advice. I swapped it over the power units and the computer works perfectly. I realise that for those providing assistance some of the questions might seem simple but for the person asking, like me, this stuff is really important to find out. So, a big thanks to all those giving their time and expertise. It really is appreciated.

  spuds 13:40 11 Dec 11

Perhaps a bit late now, but does the replacement unit have a (thermal?) fuse device fitted?.

  Strawballs 15:16 11 Dec 11

Most of us started here with the simple questions and learn from there.

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