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Hope it is of decent quality and not some £20 piece of junk. To give you an idea as to why to avoid cheap no-names,
The Bargain Basement Power Supply Roundup Review
They also have a very bad habit when they die to take out other things as well. Can make it very expensive having to replace the motherboard (and/or ram, video card, etc), all from saving a few quid on the power supply.
Bit of a long read but well worth it before buying a power supply,
Power Supply Information and Selection - Tech Support Forum