Bought XFX 9800 GT XXX, possible PSU problems or buy another?

Discussion in 'OT Technology' started by martinez32, Jan 15, 2009.

  1. martinez32

    martinez32 New Member

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    Bear with me, I'm not totally computer literate here.

    I just bought a XFX 9800 GT XXX, to replace my OE 8500 GT so I can play the newer games fairly reasonably, I don't need all the bells and whistles. The computer already had a 400W PSU and read on some sites that minimum requirments for the card are 400w, figured it would do. Went home installed it, fan on the card turned on but the LED that indicates that the card is powered didn't even light. Mind you the led is supose to light green when power is good and red when its not, it didn't even glow period.

    So I looked around and read that it needed at least 26A on the +12V rail, googled around and messageboards said that combined amps on multiple +12v rails should equal to or exceed the requirment despite lower power on just one rail. I went kinda cheap ($80) and bought a Thermaltake Purepower 500W with 14A and 15A rails, but same problem continues

    Should i just return the Thermaltake and buy a more powerfull one with at least 26A on one rail or is this defective card? My brother said it may
    possible could be a combination of both:noes:
     
  2. Doomsday

    Doomsday XXX

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    its the psu
     
  3. martinez32

    martinez32 New Member

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    any suggestions on a decent psu, brands?
     
  4. Doomsday

    Doomsday XXX

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  5. martinez32

    martinez32 New Member

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  6. XR250rdr

    XR250rdr OT Supporter

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    You did connect the PCIe connector on the card right?
     
  7. MSTRBKR

    MSTRBKR New Member

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    +1 for Corsair PSUs.

    Quality products.
     
  8. Hate Crime

    Hate Crime Don't Hate OT Supporter

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    Unless you have a ton of hardware that needs powering, or you have overclocked shit, the 500w should have powered it up.
     
  9. XR250rdr

    XR250rdr OT Supporter

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    After reading it again I'm thinking its a bad card. They are always very conservative on minimum power requirements.
     
  10. Doomsday

    Doomsday XXX

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    if this is the PSU,....

    [​IMG]

    it only has 23A total on the dual +12V rails

    that XFX 9800GT XXX is factory overclocked and draws more power than a regular 9800GT, probably around 11-12A.
    note that the 26A requirement is for the whole system.

    so,... you only got like 12A left for your cpu and other shit.

    a modern dual core cpu would consume about 6A of that.
    an old dual core or quad cpu consumes about 9-10A.
    moar if you oc.
    hdds, drives, and shit,... about another 10A.

    do the math
     
  11. dave5678

    dave5678 New Member

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    XR I think you are correct...
     
  12. XR250rdr

    XR250rdr OT Supporter

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    That current draw is at full tilt. At boot time the card isn't using hardly any power though. If it was a PSU issue it would more than likely show up when the card was stressed.

    If its not something dumb like the PCIe connector not being plugged in, its probably a bad card.
     
  13. Doomsday

    Doomsday XXX

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    boot up/power on needs a lot of juice

    and i quote PC Power & Cooling,...
    Nvidia cards, w/o the PCI-E power connector, if turned on, will scream like a bitch

    bad card? maybe. let's wait for his reply.
     

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