I would like to replace the 250W PSU in my HP a6620f with the 350W PSU from an older Dell Dimension. Any reason this would not work?
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  1. It might work. What model was the older Dell Dimension?
  2. That would be a Dimension 8400.
  3. I can think of one reason why it "might" not work. Over the years the international standards for power supplies changed. Changes were made based on power requirements of cpu's, motherboards, video cards, and other components.
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