When purchasing a power supply look for one that has a good warranty as the cheaper models are known to give out prematurely. Also here is a guide to make sure you are getting a power supply with enough wattage. Be sure to leave 100 -200 watts to spare in case of future computer hardware upgrades.
Component Wattage Requirements
Motherboard 15-30
Low-End CPU 20-50
Mid To High-End CPU 40-100
Memory 14 per 256MB
PCI Add On Card 5
Low To Mid-Range Graphics 20-60
High-End Graphics 60-100
IDE Hard Drives 10-30
Optical Drives 10-25

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