Power problems

  chrisjmat 20:32 22 Dec 2008


I have just moved my PC to the states. The power unit in my pc says max 300 watts. I have bought a step down transformer rated 500 watts. However when I start trying to play games etc the PC shuts down. I am running XP home. I think I will need to actually have to change my PC power unit for a 110 input. Is there anything I can check before doing this? I think my step dowm transformer cannot cope with the load. Any help would be appreciated and if I change the unit will a 400 watts rated one work fine?

Many thanks


  Fruit Bat /\0/\ 21:11 22 Dec 2008

I change the unit will a 400 watts rated one work fine?

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

  Switcher 22:41 22 Dec 2008

"I have bought a step down transformer"

There is usually a slide switch on the back of the PSU to allow an input voltage change from 230V to 110V.

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