Power supply upgrade

  thewasp 16:57 21 Jan 2008

My current 300w psu has been working fine now for 4 years, but the fan is a little noisy on startup.

I am planning to replace it with something the same or a bit more powerful.

This may seem a daft question but will a 400w psu constantly use more power than a 300w, even on standby for example?

There seems to be a lot of dirt cheap items on the market, how much should I pay for a quiet 350w and what should I look for?

  Diodorus Siculus 17:00 21 Jan 2008

Get a quality one - it will be more stable as well as running quieter.

I generally use the midrange hiper PSUs from Novatech.

They will only use as much electricity as they need at any time as I understand it,

For about £40 you should get a perfectly good one; just ensure that it has the currect connections for your machne.

  Fruit Bat /\0/\ 17:18 21 Jan 2008

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.

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

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