is a 250w PSU too small?

  InCog 13:41 17 Jun 07
Locked

I've acquired a replacement PSU (250 watts) but my PC keeps cutting out. Could the PSU be the problem? The PC has XP Professional / 1 gb RAM / AMD 2ghz processor (I think) /128mb video card.

  the old man 13:45 17 Jun 07

absolutely. Would suggest 350/400w to be on safe side.

  Technotiger 13:46 17 Jun 07

Hi, I would opt for nothing less than 500w and the best quality you can afford. Quality counts a lot, often a poor quality 500w is not as powerfull as a good quality 400w.

  InCog 14:13 17 Jun 07

Thanks. I'll get a new one then!

  Diodorus Siculus 20:41 17 Jun 07

Why did you get a replacement? Was the other also 250W and was it causing problems?

  woodchip 20:44 17 Jun 07

That will not make many cups of tea

  scolley 21:51 17 Jun 07

how can you check what watts your psu is now do i have to take the side off, or is it in the comp files some where,
Scolley

  Technotiger 22:13 17 Jun 07

The only way to check power of PSU is to look at the label on the side or the top of the PSU. If the label is on the top then you would need to at least partially remove the PSU.

  Fruit Bat /\0/\ 22:41 17 Jun 07

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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