Would a 400w PSU suffice for normal PC use?

  ross_mcculloch 11:18 04 Jan 08

yay or nay?

  martjc 12:39 04 Jan 08

...a machine running :

two HDDs, two optical drives, medium quality graphics card [AGP], multi-card reader, floppy drive, occasional usb devices attached a graphics tablet.

  Totally-braindead 19:50 04 Jan 08

Basically yes as long as theres no high tech graphics card installed. In fact it would run on a lot less than 400 watts.

  Fruit Bat /\0/\ 11:53 06 Jan 08

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

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.

2. Power supply calculator click here

Guide to changing PSU
click here
click here

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