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Thread: isnt 480W enought for 7900gt?

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    Unhappy isnt 480W enought for 7900gt?

    nvidia software is telling me not enough power, so settings are lowered to prevent damaging hardware.

    Now, I got a 480W Thermaltake PSU Click here with
    Motherboard
    1 x gfx card
    1 x HD 80GB IDE

    is there a setting i missed or a mistake by me? or do I need a need psu?

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    Re: isnt 480W enought for 7900gt?

    Plugged in the 6pin PCI connector yet?

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    Re: isnt 480W enought for 7900gt?

    It seems you need at least 22a on the 12v rail for the 7900gt. The PSU above indicates it only has 18a
    Last edited by Mithrandir; 27-03-2008 at 08:24 PM.
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      • Motherboard:
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    Re: isnt 480W enought for 7900gt?

    Quote Originally Posted by Grimley View Post
    Plugged in the 6pin PCI connector yet?
    Yes i have connected both ends

    Quote Originally Posted by Mithrandir View Post
    It seems you need at least 22a on the 12v rail for the 7900gt. The PSU above indicates it only has 18a
    Seems like you are right, looks like new PSU for me

    Kind of worried too, read in alot of forums about 7900's crashing

    Thanks guys

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    Senior Member Pob255's Avatar
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    Re: isnt 480W enought for 7900gt?

    The problem is not that it's got enought power but not enough on the +12v
    With only 18a on a single rail it's not cutting it.

    For a relatively lowcost PSU have a look at the Corsair VX450w, should be more than enough power for you, good quality and it's not going to cost the earth.

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    Re: isnt 480W enought for 7900gt?

    Quote Originally Posted by Pob255 View Post
    The problem is not that it's got enought power but not enough on the +12v
    With only 18a on a single rail it's not cutting it.

    For a relatively lowcost PSU have a look at the Corsair VX450w, should be more than enough power for you, good quality and it's not going to cost the earth.
    oh ok, that corsair has 33A on +12. Yesterday I had the Blue Screen of Death, so emailed Nvidia, as I'm thinking it might be memory leak.

    Although it looks like i need a new PSU anyways as most new cards require more power, right?

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    Senior Member Pob255's Avatar
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    Re: isnt 480W enought for 7900gt?

    Yes however ss I said before it's the move to +12v that before was not used much, older PSUs like yours are stressed more on the +5v which was mainly used by the cpu and feeds the graphics card through the agp slot, the +12v was only used for fans, cd rom and hard drives.
    However with the 6 series geforce onwards the graphics card started useing the +12v far more and then the newer cpu's also started using the +12v.

    Blue screening can be caused by power problems, mainly as the PSU starts to get pushed on any one rail that rail can often start fluxtuating and this instablity can cause problems. This is often where a quality PSU shows over a low quality one, a low quality psu will get lots of power noise and may not be capable of sustaining it's "given" wattage, where as high quality psu will have less power noise as it approaches it's given specs and useally have a cutout to stop the psu from going over spec when thus never getting to the point when power noise would become a problem.
    Beware this can also lead to damageing your graphics card.

    Bit of a shame really because a few years back that PSU would of been a good solid unit and should in theroy of lasted a good while if voltage focus hadn't shifted.

    Have you got a friend who has a pc which you could try this card out in?
    Most independant local pc shops will happly agree to test a card if you ask them (but will often charge you) however they are often more open to haggling and a chance of a sale. . .
    You may be able to get them to test the card as part of a deal on a new psu although find out what they want to sell you and for how much first. Then do a bit of research on how much there sugested psu's cost elseware and what these psu's are like. (beware of over selling)

    PS what's the rest of your system?

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      • Motherboard:
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      • CPU:
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      • Memory:
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      • PSU:
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      • Internet:
      • 8MB..but BT so 512kps

    Re: isnt 480W enought for 7900gt?

    yeah its abit annoying as I can not tell what causes the actuall problem.

    The card works, as I can play BF2 and Colin Mcrae 4. However 2-3 times when I was playing online with BF2, the game crashed, closed and I was back at the Desktop. And yesterday I had the blue screen while i was chating on Messenger.

    I think I'm gona go for the corsair vx550, however I think the card has problems rather than PSU. Think my PSU is couple years old, but back in the day it was a "beast"

    System:
    775twins V1 Mobo
    Corsair 1GB DDR2 675MHz/PC2-5400 XMS2
    80GB IDE Hard Drive
    D-link g520 Wireless Card

    quick question, vx520 is ATX2.2 what does that mean, new case?

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    Senior Member Pob255's Avatar
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    Re: isnt 480W enought for 7900gt?

    Nope new standard but no differnce in size, main motherboard connector is 24pin instead of 20pin (but the additional 4 are detachable so backwards compatable.
    Also covers the higher volatges on the +12v rails

    Ummm there is no VX520w that I know of, did you mean the HX520w?

    PS what CPU?
    and is this the motherboard?
    ASRock Motherboard - Product - 775Twins-HDTV - Overview

    EDIT: the HX is modular the VX is not, the HX has the +12v split over multiple rails the VX is a single rail (note these are differnt ways of doing it the end resault is not realy differnt) the vx450 will be enough to power your system the HX520 is slightly overkill but a great PSU.
    If you want modular and can afford the extra the HX520 is a good buy
    If you want to spend enough to run it and no more VX450 (note the vx450 would power more than what you have so you probably could find a decent PSU for the job for less, the vx450 would take a 7900gtx with ease which has nearly twice the power consumption of the 7900gt)

    EDIT2: don't be miss lead by the 700w PSU in my spec, it's total over kill for my system, I was planning on getting vx450 and a 7900gx2 at the time, however this psu came up on a half price sale and for £37 it was a real bargin
    Last edited by Pob255; 28-03-2008 at 02:30 PM.

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    • serlex's system
      • Motherboard:
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      • CPU:
      • 3.2 Pentium Dual Core
      • Memory:
      • Corsair 5300 1GB
      • Storage:
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      • Graphics card(s):
      • Crapy 7900GT
      • PSU:
      • Thermaltake 480W
      • Case:
      • Plastic
      • Monitor(s):
      • 17" Flatron LG
      • Internet:
      • 8MB..but BT so 512kps

    Re: isnt 480W enought for 7900gt?

    I have a 3.2ghz Dual Core Pentium on the mobo you linked to

    Just did a google on 'bf2 exits desktop', I'm not the only one, although cause of the problem can be: Driver, Game Patch, PSU, DX9 files, Graphics card...

    Reason I said 550w or even 520w, I was thinking about the future :d. However this 7900gt is my first card over 4-5 years now, previously i had 64mb 440x then 64mb onboard PCIE...

    Thanks for the help by the way

  11. #11
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    Re: isnt 480W enought for 7900gt?

    I have a 480W Thermaltake Butterfly running an E6600, an 8800GT and three SATA hard drives as well as an Xfi and 5 120mm fans (reduced voltage via controller), I game a fair bit with four hours of COD4 at a time common, never had a problem

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