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Hello, I have a Dimesion 3000, P4 2.8 GHz that is dead. I was going to try to replace the power supply in it. It has a 250 Input 100-120 /6A 200-240 /3A output +5V 22 A Max ect.. Do I have to replace this with the same one or can I put a larger watt in it? If I can put a different one in it, What would you suggest? Thanks for the input.

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  • Latest Post Latest Post by tocalosh

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Higher wattage is fine in principle, but it is not the only thing that matters. was right that required wattage depends on the parts you actually have, and is right that calculator pages can be flaky — so check the machine itself rather than relying on a single online tool.

Quick checklist to confirm compatibility:

  • Open the case and note the main motherboard power connector and the CPU power plug. If you see a standard ATX 20/20+4 pin main connector plus a 4-pin (ATX12V) CPU plug, a modern ATX replacement will usually work.
  • Check drive power plugs (Molex vs SATA). Modern PSUs sometimes lack legacy Molex; cheap adapters exist but use them only if necessary.
  • Look at the original PSU label for a part number and the rail amperages. If the PSU uses a single odd plastic block or unusual connector, the chassis may require a proprietary Dell unit — in that case match the OEM part number or find a verified adapter.

What to choose:

  • For a P4 2.8 GHz system with no discrete GPU, a quality 300–400W PSU from a reputable maker (80 Plus certified if possible) is typically more than enough. If a discrete graphics card or several drives are present, pick a higher-rated unit and ensure the +12V rail has adequate amperage. Aim for 20–30% headroom rather than buying the smallest possible unit.

Installation and safety notes:

  • Unplug the PC, ground yourself, and confirm screw-hole alignment and cable reach before final assembly. Incorrect pinouts or forcing a nonstandard connector can damage the board. If the PSU connector looks proprietary or you are unsure about rail amperage, use the exact OEM replacement or have a technician fit a compatible ATX unit.

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Member Avatar for rch1231

Hello,

Yes you can put in a higher wattage power supply. The wattage really depends on the devices you are going to run from the power supply. There is a pretty good calculator on the ASUS web site but it is primaryl for theior mother boards but it will give you an idea.

Member Avatar for tocalosh

Dude the calculator does not work

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