Adequate Power Supply??

By macx
Dec 5, 2005
  1. Helping a friend with a few upgrades on a Compaq Presario

    It came with one 40g 5400rpm drive, and (only!) 128 Ram.

    I'd like to add a 7200 rpm West Digital drive of around
    80g, one 512 stick of RAM and a 92mm Antec Smart
    case fan (the only fan it currently has is for the 2g AMD cpu).

    They only have one small PCI fax modem dialup card.

    It's got a 250 watt power supply - will that be enough?

    (I didn't see ANY graphics card in it)

  2. DonNagual

    DonNagual TechSpot Ambassador Posts: 2,404

    It's hard to say really. It depends on what else you have hooked up to that system, and more importantly, the quality of that 250w psu you have in there.

    But, you can take a look at this calculator to see how much power you need:

    From what you have described above, 250w will probably be enough, assuming it is a quality PSU.
  3. iss

    iss TechSpot Chancellor Posts: 1,994

    if it is able to recognize and use a 40GB drive then it should be able to use a hard drive up to at least 137GB without a bios update.

    the power supply should be ok as long as you arent trying to load up multiple hard drives, three or more optical drives and a power hungry AGP video card.
  4. Greenmachine

    Greenmachine TS Rookie Posts: 149

  5. macx

    macx TS Evangelist Topic Starter Posts: 710

    Really appreciate the input & info!!

    Love that power calculator!
    Looks like we'll have a little to spare,
    even taking the higher of the available
    listed 2.0 AMD Athlon CPUs and adding
    a USB camera.

    I just built a new unit (2.8 P4 Northwoods,
    ASUS P4C800E-Del board, with a GEForce 6600GT,
    2 512 sticks of DDR RAM, a CDRW, Floppy, 1 IDE
    & 2 SATA drives, 92 & 120mm plus the original 80
    case fans, and a 1394 & several USB external
    devices (although not all working at once)
    and I was VERY happy to see I had plenty
    power to spare with my 450 watt PSU.

    BTW - I learned a LOT about building &
    configuring it, not to mention what components
    to select, on this site. Steep ramp up in
    my learning curve!

    I now can render home video to my heart's
    content for hours without dropping a frame
    and the CPU hasn't gone over 41C & the board
    over 30 C yet!!
    BIG :approve:

    Thanks to all who helped educate me!!!
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