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What to look for in a new PSU?

Discussion in 'General Hardware' started by ny_driver, Jan 21, 2007.

  1. ny_driver

    ny_driver New Member

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    Given my specs I want to make sure everything will have enough power when it's OC. There are many PSU to choose from and the prices vary greatly. I'd like to order one from new-egg tomorrow but like I said I don't know what I need. Any advice will be most appreciated:respect:
     
  2. KennyT772

    KennyT772 New Member

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    well look for a good consumer rating along with explanations of why. i am a big fan of thermal take power supplys, and just recently i purchased a hiper 580w unit. i would actually reccoment that to you also. the psu was about $85 when i ordered it. they have a bunch of other colors too.

    http://www.newegg.com/Product/Product.asp?Item=N82E16817128002
     
  3. ny_driver

    ny_driver New Member

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    That looks nice but I really want something cheaper. I am not looking for something to build off of in the future, just something to make sure the power is not an issue in my current system when it is highly overclocked.
     
  4. KennyT772

    KennyT772 New Member

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    well if you want to put your system at risk go for it. i ran my x1800/3200+ system off a thermaltake 420w psu for almost a year and she was solid. the 12v rail was stable but under load it would dip to 11.6v.
     
  5. _33

    _33 New Member

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    You could always look for a good company, like OCZ, ThermalTake (Toughpower series), Antec (Truepower series), Enermax (some rare good ones), Raidmax (good prices, decent reviews), Silverstone (the top of the line IMHO).

    Next, you want many 12 volt lines. Usually, they now come up with 3 or 4 lines. The good thing with multiple 12v lines is that when one peripheral uses max wattage out of one 12v line, the others don't suffer. It's much better than a single 12v line. That is the reason I switched from a class B PSU to my new TT Toughpower 600. It's rock solid power for my system. Before I used to hear my fans go slower when I launched games / 3D apps, and my voltages use to fluctuate a lot. Now with this new quality PSU, it's always stable and no fluctuation. Also note, a light weight PSU is always sign of cheapness.

    You could always look for separate wires that you then plug in the PSU at your leasure, so you don't get tons of wiring in the box for nothing.

    Depending on your forecasted consumption, check between 600 and 850 watts. 600 watts should be enough for most configurations, SLI / crossfire, dual core, and all those HDDs and DVD / CD drives, and the USB power. 850 watts would probably be good for dual R600 / 8800GTX card setup.

    I suggest to choose wisely!
     
  6. KennyT772

    KennyT772 New Member

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    hey _33 multi-rail units are not generally better power supplys. it all depends on the design. some multi-rail designs completely separate the various rails so if one is maxed out and the other has no draw you are wasting half your power. other designs have capped draw per rail but will still share current right up to the cap.

    single rail designs are still the general favorite design by overclockers as no matter what you can use every watt available. either way posting a question about a certain psu will give you a good about of feedback from that unit.
     
  7. _33

    _33 New Member

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    Have you ever seen a 800 watt PSU single rail? Come on. I come back here and post after what, 2 months. Here comes those lessoning guys again.

    Chow.
     
  8. ny_driver

    ny_driver New Member

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  9. pt

    pt not a suicide-bomber

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    ?
    it has been said and proved that a single rail with a high A is better than multiple rails with lower A ;)
     
  10. ny_driver

    ny_driver New Member

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    so is the one I showed a single rail high A or no...please explain:confused:

    EDIT:looks like it is to me
     
    Last edited: Jan 21, 2007
  11. Guttboy

    Guttboy New Member

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  12. ny_driver

    ny_driver New Member

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    hmmm..thanks:eek: the one I was going to get used is on the NOT RECOMENDED list for some reason, and I don't see my current PSU (powmax) on the list. I thought that Ultra x-connect had good amperages:confused:

    Oh well I will use that list and go buy a new one..hopefully pretty cheap ($50-80 )
     
  13. Guttboy

    Guttboy New Member

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    NY....not sure how the list was come up with but it was posted here earlier. MY current PSU is tier 5 and I am pretty sure that is correct as my voltages fluctuate quite a bit.

    I do know one thing...dont skimp on your PSU...I have had some computers with crappy PSU's and it is no fun not being able to do the things you want because there was a crappy PSU that you coulda spent $20 more on and had a much better one.
     
  14. overcast New Member

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    PC Power and Cooling has single rail power supplies from 310W to 750W

    If you're going to go cheap on anything, DO NOT MAKE IT BE THE POWER SUPPLY.
     
  15. ny_driver

    ny_driver New Member

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    I decided to buy an XCLIO greatpower 600w for $99.99, this one here........:toast:

    http://www.newegg.com/Product/Product.asp?Item=N82E16817189007

    Not that pretty but it looked like the best tier 2 PSU at new-egg for the price. It has modular cabling and a big 140 mm fan ( I like fans) :pimp: Mostly great reviews and I have always had good luck with the egg so far. Any thoughts on my decision?

    Thanks all for the sound advice:respect:
     
  16. Guttboy

    Guttboy New Member

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    I have no experience with them but the reviews are pretty good. I guess the manual leaves something to be desired but the reviews in the "egg" are pretty comprehensive.
     
  17. _33

    _33 New Member

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    Well, the market doesn't seem to bide by your rules. Maybe post a link to support your theory.
     
  18. pt

    pt not a suicide-bomber

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    it has been posted here on tpu i don't know where
    the market is most of the times wrong
     
  19. _33

    _33 New Member

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    I don't mind. TPU doesn't direct the market, they just spread the word. Right now the market is going towards multi 12v lines. Mine has 4, for 600w. And I have noticed much increased stability on the 12v compared to my previous PSU. Silverstone, which makes the best PSUs around do have multiple 12v lines on most of their flagship products: Element, Zeus & Strider series. Only the Olympia series has a single 12v line (wich might support part of your beliefs).
     
  20. pt

    pt not a suicide-bomber

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    the market is also going towards multiple cores, and still most ppl won't use more than one ;)
     
  21. Guttboy

    Guttboy New Member

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    This was taken from PC Power & Cooling and if you look in other spots you can find the same info by using Google......

    "8. ARE MULTIPLE 12-VOLT RAILS BETTER THAN A SINGLE 12-VOLT RAIL?
    With all the hype about multiple 12-volt rails (ads claim that two rails is better than one, five is better than four, etc.), you’d think it was a better design. Unfortunately, it’s not!

    Here are the facts: A large, single 12-volt rail (without a 240VA limit) can transfer 100% of the 12-volt output from the PSU to the computer, while a multi-rail 12-volt design has distribution losses of up to 30% of the power supply’s rating. Those losses occur because power literally gets “trapped” on under-utilized rails. For example, if the 12-volt rail that powers the CPU is rated for 17 amps and the CPU only uses 7A, the remaining 10A is unusable, since it is isolated from the rest of the system.

    Since the maximum current from any one 12-volt rail of a multiple-rail PSU is limited to 20 amps (240VA / 12 volts = 20 amps), PCs with high-performance components that draw over 20 amps from the same rail are subject to over-current shutdowns. With power requirements for multiple processors and graphics cards continuing to grow, the multiple-rail design, with its 240VA limit per rail, is basically obsolete.

    PC Power and Cooling is once again leading the industry. All of our power supplies now feature a large, single 12-volt rail. The design is favored by major processor and graphics companies, complies with EPS12V specs (the 240VA limit is not a requirement) and is approved by all major safety agencies such as UL and TUV."

    Taken from this website.....

    http://www.pcpower.com/technology/myths/

    Regards!
     
  22. ny_driver

    ny_driver New Member

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  23. _33

    _33 New Member

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    And here is my cross argument link

    Everyone is going multi 12v rail, and that is a fact. Even if you see constraints in this, that is where the market is going, future proof or not. Now saying a 4x 12v rail PSU consumes more is ridiculous, as the PSU will consume as much as there are things plugged on it. Yet, it is true that you will need stronger multirail PSU than a single rail psu (my belief), sin on a multi-rail you will have some lost power potential on those multiple 12v rails. But some designs do make twin dual 12v rails, which in essence distributes each internal 12v in 2 x 12v rails that have a peak amperage each, so no big loss in amperage on that design. Yet each 12v rail should have a max amp draw of 20A as a guideline (most PSU manufacturers use 18A max, as it gives a margin for peaks up to 20A).

    READ THIS QUESTION CAREFULLY:
    EDIT: Also, to add to the tought, imagine you trick the wiring from a 4 pin molex to plug your own fans, and stuff, but the wiring flashes and it shorts your 12v single rail. WHat do you think will happen to your GFX card, your CPU and all the other stuff plugged on that single rail?
     
    Last edited: Jan 22, 2007
  24. ghost101

    ghost101 New Member

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    :)
     
  25. AshenSugar

    AshenSugar New Member

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    click my siggy link, and fortron or epower are the best value for power and quility
    you can find :)
     

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