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I had the 300W powersupply fail in my main home PC and searched on line for an exact replacement. I couldn't believe the price, so I did a search on line and found that Best Buy carried the Dynex™ 400-Watt supply at half the price (and a third more power rating). Our local store had it in stock, I showed up as soon as they opened; they let me take the new supply out of the boxt so I could compare form-factor and plug configurations. I was back home, up and running in less than an hour.
What's great about it: Form, fit, and function replacement