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Power Supplies

Discussion in 'Building a new PC' started by ddp, Mar 30, 2009.

  1. omegaman7

    omegaman7 Senior member

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    Please keep an open mind. I do not wish to anger anyone. :)

    This makes me rather nervous. And its not an isolated incident. This review was for the 850W Zalman.

    As you'll notice in the 300W versions title, its capable of running 295GTX in sli. NO NO, I dont believe that would hold up for long. Thats no doubt its PEAK PEAK! But im not looking at the 300W version, im interested in the 450W 85% efficiency version.
    http://www.newegg.com/Product/Produ...mpareItemList=N82E16817104054,N82E16817104019
    You do notice(Despite no one owning one long)that its receiving VERY good reviews.

    Your probably right though *sigh* I simply can't afford much right now, and am entertaining the cheapest ideas that present themselves. I would much rather buy an EXTREMELY capable PSU, and be done with it. I would love a PSU that could run my setup without breaking a sweat!
     
    Last edited: Apr 27, 2009
  2. sammorris

    sammorris Senior member

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    With PSUs, you should know it's of paramount importance not to trust brands that have made bad products in the past. These products look similar bar the wattage, so if one is poorly made and overspec'ed, the higher wattage one is even more likely not to perform as indicated.
     
  3. omegaman7

    omegaman7 Senior member

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    Any thoughts on the shrieking noise the Zalman makes?
     
  4. sammorris

    sammorris Senior member

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    I had this, or thought I had this, but it actually turned out to be my X48-DS5. In his case, I wouldn't mind betting it's the GPU.
     
  5. omegaman7

    omegaman7 Senior member

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    Why do you suppose it would make that sound?
     
  6. sammorris

    sammorris Senior member

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    All graphics cards make a shrieking noise to some extent, usually only under load (Hence me picking up on the 'any time my GTX260 is doing something' comment) - it's caused by the power regulation phase. This is also why my X48-DS5 did it. Gigabyte's E-series power regulators for their more expensive boards such as the EP45-UD3 series can sometimes do it too, but only if Loadline Calibration is enabled, or at least, much less so if it's disabled. Graphics cards are automatically loadline calibrated as far as I'm aware.
     
  7. omegaman7

    omegaman7 Senior member

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    Mine does not make any audible shrieking sounds. The only thing audible is its fan. And I only hear it when I crank it up LOL!

    Now im looking at an 850W Corsair. VERY good reviews, amperage looks good from a reputable manufacturer. The price makes it VERY tempting. I was looking at the 1000W, but this one looks like it would serve my needs almost easily. I HOPE!
    http://www.newegg.com/Product/Produ...mpareItemList=N82E16817139007,N82E16817139009
     
  8. sammorris

    sammorris Senior member

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    The Corsair 850Ws are fine, but they are CWT units, of high quality, but not the excellent Seasonic standard that makes the 450VX,520HX,620HX and 650TX so popular. They are also non-modular, and much noisier than the Zalmans. They are also, pre-rebate at least, only $10 cheaper. Due to it sharing technology with a 1KW version, the ZM850-HP can go higher than its rated spec. The 850W TX is the end of the line for the standard CWT platform, it shares its design with 750W and 700W units so probably can't be pushed. The Zalman on top of all that is more efficient. Your call. The Corsair is still a good unit, but the Zalman is better in a large number of ways.
    Of course, this is all over the top, as the 520W HX will power your PC perfectly.

    Edit: The graphics noise is never loud, it's only audible in quiet systems. The average PC makes too much fan noise for it to be noticeable.
     
    Last edited: Apr 27, 2009
  9. omegaman7

    omegaman7 Senior member

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    Hmmm...perhaps if its price comes down in a few weeks. Since ive seen unusual activity regarding separate 12V rails, a system with 6 Rails just seems like a marketing scheme. But then, as I've said, I know EXTREMELY little about PSU's. So if the Zalman, comes close in price to the corsair 850, I just may go on it. And hope like heck, that its not indeed the PSU making the curious shrieking sound that MULTIPLE people talk about. I do like its specifications! If I had the money, there would be no question.
     
  10. sammorris

    sammorris Senior member

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    An extra 10 bucks up front? If times are hard, why are you buying an 850W PSU when a 500 would do?

    I have never found multi-rail PSUs to be an issue, you have to have a seriously unusual system for that to pose a problem (Say, a dual core CPU and 16 HDDs). Even then, that was because it was only a 16A rail. The limits on the Zalman are more generous on rails 2 & 3.
     
    Last edited: Apr 27, 2009
  11. omegaman7

    omegaman7 Senior member

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    Corsair 850=144.99(before 25$ rebate)
    Zalman 850= 169.99

    Though the savings one gets from the Zalman is good. 214.99 originally
     
  12. sammorris

    sammorris Senior member

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    My mistake, I could have sworn it was $154.99 when I looked.
     
  13. omegaman7

    omegaman7 Senior member

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  14. sammorris

    sammorris Senior member

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    It's only the rebate. That PSU is only worth about $100, I don't remember seeing it go for that much more.
     
  15. omegaman7

    omegaman7 Senior member

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    Last edited: May 5, 2009
  16. sammorris

    sammorris Senior member

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    The 620HX is modular and multi-rail which adds significant expense. It is also designed with a more stringent noise criteria. Since the 620HX is multi-rail (and the maximum 12V output is always less than the sum of the rails, or there's no point, think about it) you're thinking there's more to the 620's output than there actually is.
     
  17. omegaman7

    omegaman7 Senior member

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    Ok, I think I understand now. But I still raise a brow at modular design. Looking at the connection/extension for my CPU, it makes me wonder if im losing power there. If only a minor amount. I'm probably worrying for nothing LOL! Its a tested proven technology, or they wouldn't be mass marketing it. LOL, would they...(the benefits probably outweigh)
     
  18. sammorris

    sammorris Senior member

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    I've had several modular PSUs, and I've never had an issue with that part of any of them.
     
  19. omegaman7

    omegaman7 Senior member

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    Ahhh...but yours were High dollar, High grade parts(Good manufacturer).

    Once again, I kick myself in the butt LOL!
     
  20. omegaman7

    omegaman7 Senior member

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    Well...I did it! I bought the 400W corsair, for my secondary PC. I didnt like it being inactive. Besides, it may go to my mother. Not sure yet. A lot of people think its quiet, and a lot of people think that ALL of their PSU's are good. Now I can experience them for myself, without having to spend TOO much :)
    http://www.newegg.com/Product/Product.aspx?Item=N82E16817139008
     

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