8800GT power supply

By mitch04
Nov 1, 2007
Topic Status:
Not open for further replies.
  1. kpo6969

    kpo6969 TechSpot Maniac Posts: 875

    1.This link:
    8800GT on a 250w psu:
    http://www.ocforums.com/showthread.php?t=534311
    I only posted to make a point
    2.Your statement:
    "380W is asking for trouble and the point is, when it does go, it is likely to take out other components with it."
    Has been invalidated if you know what your doing.
    3.I refer to my statement
    "For an Antec 27amp psu at a $20 price point I can't really disagree even though I wouldn't do it myself, but it can and has been done. My opinion."
    4."Show me" the rational for your statement:
    "I use a 750W corsair, which is overkill, but i will want to upgrade specs in the future. It has a 60A on 12V rail amazingly."
    What upgrades do you have planned that a nuculear reactor is required?
  2. Bigfellla

    Bigfellla Newcomer, in training Posts: 108

    Mainly storage but also mods such as watercooling, sli cards, etc. My point hasn't been invalidated because there has been no testing on that thread. Show me a 8800GT running on a 380W system - show me the voltages. My point is simple, yes it will boot in all likelyhood, it may even game ok for a few months, BUT it will eventually fail and when it does, it will make a big mess. As rage says, "It won't always but it can". Its a game of russian roulette.

    This forum (i thought) is about enthusiasts giving solid advice. A modern system, with top end GPU and room for upgrades shouldn't be powered by anything less than 500W. But remember, its the efficiency thats also important and the stability of the power delivered. I think it is very bad advice to say to someone who is asking what power requirements they need, to buy a $20 PSU. I am not saying you need to get a $200 one like i did.

    The sad truth is very few PSU’s really produce the wattage that the companies advertise. Even if these low quality supplies could produce the wattage they advertise, they could not sustain those outputs for long. The rating and tests are usually only performed at 70% load for 100 hours. That means that PSU’s can’t sustain meager loads greater than 70% for any substantial period of time. In addition, the testing environement is unrealistic, since they test in abnormally cold testing climates of 25C.

    In my opinion, a 500W PSU is minimum for that system. Anything lower and you are tempting fate. Look here for some more information: http://www.techsupportforum.com/har...92217-power-supply-information-selection.html

    A selection of great PSU's for different applications is listed, plus a detailed article about why a 250W or even a 380W PSU is a very bad idea!
  3. kpo6969

    kpo6969 TechSpot Maniac Posts: 875

    "Show me a 8800GT running on a 380W system - show me the voltages."

    How about a X1900XT?
    8800GT = 105w
    X1900XT = 109w

    http://www.ocforums.com/showthread.php?t=512807

    Since this statement I believe is directed at me:
    "This forum (i thought) is about enthusiasts giving solid advice."

    If anyone believes I'm giving baseless advice please post.
    Whatever I post I have documentation to back it up.

    "show me the voltages"
    in link above
  4. Bigfellla

    Bigfellla Newcomer, in training Posts: 108

    Oh, very conclusive. Test period of 1 week.

    Dont be so sensitive mate, i simply disagree with your opinion. You can find support for any point you wish to make on the internet

    Also, thats more than double the price you are s****ting. You suggested a $20 PSU, and he's using a $50 PSU. Give it another 2 months and then it would be a better test.


    And actually a system with a 8800GT can actually draw closer to 250W on peak and about 150W on idle.

    http://www.tomshardware.com/2007/10/29/geforce_8800_gt/page14.html

    http://arstechnica.com/journals/har...-consumption-of-the-ati-radeon-hd-3800-series.

    So as i said, show me the voltages of a 8800GT running flat out on a 250W PSU/ or a 380W PSU if you like.
  5. Bigfellla

    Bigfellla Newcomer, in training Posts: 108

  6. kpo6969

    kpo6969 TechSpot Maniac Posts: 875

    To each his own.
    Shall I toss my Silencer470 @ 26amp psu?
    Price of the psu is irrevelant in this instance. ($20 after rebate)
    So my under-powered psu I suppose is a fluke running:
    8800GT SC o'cd
    4 sticks DDR2 ram
    2 HD
    2 optical drives
    X-Fi sound card

    Best of luck to you in your future upgrade. Hopefully you'll do it before your psu's longevity factors in.

    Electrolytic capacitor aging. When used heavily or over an extended period of time (1+ years) a power supply will slowly lose some of its initial wattage capacity. We recommend you add 10-20% if you plan to keep your PSU for more than 1 year, or 20-30% for 24/7 usage and 1+ years.
  7. Bigfellla

    Bigfellla Newcomer, in training Posts: 108


    No, your psu is fine i think, but you will need a new one on your next upgrade.
  8. SNGX1275

    SNGX1275 TS Forces Special Posts: 12,279   +223

    Mitch's specs:
    He wants to put an 8800GT in it, and Bigfella says 500W Min for that, anything less and its going to die after a period of time. Correct? Also wants to see voltages on 12V rail under load for a PSU.

    Well if I get around to it this weekend I'll run my system again with my Kill-a-watt inline, and connect a multimeter to a 12V rail on my system. Which should be using more power than his. System specs in the pulldown to the top right of this post.
  9. Bigfellla

    Bigfellla Newcomer, in training Posts: 108

    Yes. You can read.

    Anyway, i think i have made my point.
  10. kpo6969

    kpo6969 TechSpot Maniac Posts: 875

    Mitch's Current setup:
    Recommended PSU Wattage: 204w
    Amperage (combined)
    +3.3V +5V +12V
    4.0 A 7.4 A 12.8 A

    Mitch's proposed setup w/8800GT
    Recommended PSU Wattage: 238w
    Amperage (combined)
    +3.3V +5V +12V
    4.7 A 7.4 A 15.5 A

    Figures using Extreme Power Supply Calculator Pro v2.5
    http://www.extreme.outervision.com/index.jsp
    cpu % used 85%
    system load % used 90%

    Of course pci cards, case fans, non external powered usb devices, etc would have to be added (which is a few watts here and there depending what they are).

    I normally do not recommend cheap psu's but the EA380 @ 27A is an outstanding value for $20 (normally $60).
    The EA430 @ 30A for a few $ more is better sure
    The EA500 @ 34A sure if you need it, no qualms here

    Anyway, i think i have made my point.

    And I practice what I preach also:
    my system:
    cpu % used 85%
    system load % used 90%
    Recommended PSU Wattage: 287w
    Amperage (combined)
    +3.3V +5V +12V
    4.6 A 12.5A 17.5A

    These psu calculators are a guide only anyway to give you a rough idea where your at and what you need.
    The choice is the end-user's since they have to run their system. Thanks
  11. SNGX1275

    SNGX1275 TS Forces Special Posts: 12,279   +223

    What point? That you need at least a 500W PSU to run that? I'm likely running a higher current draw than he would be on a 485W and I'm not even close to taxing it, and I'm doing this with real numbers not a PSU Calculator.

    I'm not disagreeing with you that a $20 PSU is probably not good, nor am I disagreeing that his current one might be a bit weak on the 12V rail. I am disagreeing with you needing a 500W to run that. Hell, a quality 350 would run it, maybe even a quality 300W, but I probably wouldn't.
  12. kpo6969

    kpo6969 TechSpot Maniac Posts: 875

    I agree completely. The point I was making with Bigfella was the EA380 is no normal $20 unit and an excellent value and quality psu.
    reg price = $59.99
    sale price = $49.99
    mail in rebate = $30.00
    cost = $19.99
    specs
    +3.3V @ 20A, +5V @ 20A, +12V1 @ 17A, +12V2 @ 17A, (27A combined 12V)
    http://www.newegg.com/Product/Product.aspx?Item=N82E16817371005
  13. DeepMartin

    DeepMartin Newcomer, in training Posts: 89

    yea but for how long u think its gonna last before it goes out? lol well my friend is running a 8600GT and his 350W PSU died (stock HP psu about a year of use with the 8600) and had to replace it recently
     
  14. kpo6969

    kpo6969 TechSpot Maniac Posts: 875

    How many amps on the 12V on the HP 350w psu?
    8600GT = 18amps needed
    8800GT = 22-24amps

    380w psu in question = 27amps

    Most HP oem psu's are 300w that I've seen.
  15. SNGX1275

    SNGX1275 TS Forces Special Posts: 12,279   +223

    That is probably a good PSU, I guess in all the posts I didn't pay enough attention, so my fault on that. I incorrectly assumed it was straight up retail of $20, which is probably no good, lol. But that one isn't $20 until rebates. I've always heard good things about Antecs, even though I'm 0 for 1 on using them.
  16. DeepMartin

    DeepMartin Newcomer, in training Posts: 89

    he is running a 3.0 GHz P4 HT (LGA775)probably why he has that 50w extra
    i think thats wht killed the psu the most a big electricity eater that the p4s are and also leaving it on all day and night which i think cuts the lifespan by half lol
  17. kpo6969

    kpo6969 TechSpot Maniac Posts: 875

    Antec wouldn't be my 1st choice either but you can't beat the price/power ratio (amperage, not wattage).
    PC Power and Corsair are what I would prefer.
  18. Bigfellla

    Bigfellla Newcomer, in training Posts: 108

    All good points. I guess i am in the "i would rather be safe than sorry" camp. :)
  19. Rendar77

    Rendar77 Newcomer, in training

    Sorry if this is necromancy....
    but I'm getting a new computer next week. Specifically an HP m9100z (Sorry but it won't let me post a link.)

    Athlon X64 6000+ dual core 3.0Ghz
    2GB DDR2-667MHz dual channel SDRAM (2x1024)
    ---I plan on upgrading to 3GB with 2 sticks I have laying around from my old computer.
    128MB NVIDIA GeForce 8400, DVI-I, VGA
    ---Hoping to replace this with an 8800GT.
    350W PS (I can't find the specifics on it)
    320GB 7200 rpm SATA 3Gb/s hard drive
    802.11 b/g USB Wireless LAN card
    LightScribe 16X max. DVD+/-R/RW SuperMulti drive

    My question is this: Will I need to get a new PS for an 8800GT? I don't really like the idea of tearing out my computer's heart as soon as I get it, but if I have to, I will. I don't plan on overclocking anything.
    Also will this card even fit in my case? I've heard it's rediculously long.

    Thanks.
  20. Rage_3K_Moiz

    Rage_3K_Moiz Sith Lord Posts: 7,277   +22

    Yes a new PSU will definitely be needed.
  21. kpo6969

    kpo6969 TechSpot Maniac Posts: 875

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