1. Welcome to TechPowerUp Forums, Guest! Please check out our forum guidelines for info related to our community.

Need POwer Supply Info

Discussion in 'System Builder's Advice' started by bear2790, Jan 13, 2011.

  1. bear2790

    bear2790 New Member

    Joined:
    Aug 1, 2008
    Messages:
    206 (0.06/day)
    Thanks Received:
    22
    How do I chose a quality power supply and How do I determine the real power need.

    Some have said online PS calculators give erroneous results. Others say products are not posted with the real specs - that tMFG's use exaggerated numbers therefore, a more expensive supply might provide more power than a cheaper costing supply with a higher rating. Still others say stick to the better known MFG's. But reviews sing the praise of less known (and therefore, usually lower costing) Manufacturers.

    How can I know what brand to buy once I have my power requirements figured out ?

    I'll be running the following:

    MSI NF980-G65
    Phenom II x 4 955 (OCed)
    2 x 460GTX 768MB
     
  2. streetfighter 2

    streetfighter 2 New Member

    Joined:
    Jul 26, 2010
    Messages:
    1,655 (0.65/day)
    Thanks Received:
    732
    Location:
    Philly
    Unfortunately PSUs aren't advertised like circuit components (with hugely detailed independently verified datasheets). The manufacturers like to hide behind marketing terms and BS. The idea behind buying popular brands is usually the hope of getting good components, but very few PSUs are made by the company whose name is on the box.

    What I do is calculate the wattage I need, then look up models around that wattage that have active PFC and 80 Plus certification. Then I get professional reviews (where they tear apart the PSU and took pictures) so I can find out who actually made the PSU. Then I eat dinner.

    Some resources that might help you:
    http://www.tomshardware.com/reviews/psu-manufacturer-oem,2729.html
    http://extreme.outervision.com/psucalculatorlite.jsp

    Believe it or not but it's just about impossible to determine the "real power need" unless you know in advance what you'll be doing with it. Thermal Design Power refers to the maximum expected wattage, not the maximum possible. In that respect I think that most PSU calculators do a decent job. If you're planning on running prime95 while running furmark, copying huge files between all your HDs and network, burning CDs and playing really loud music you might need to give yourself a few extra hundred watts of overhead in your PSU power requirement calculations.

    Think of it like building a bridge... You can use lots of designs that would support the typical load of cars, but just in case anyone wants to drive a tank across it you double the number of bolts used to put it together. If you don't have the money to double the bolts, then you better hope that war doesn't break out. :D

    EDIT:
    I removed these links because they're old (>2 years old). I'm adding them back just as a reference.
    http://whirlpool.net.au/wiki/PSU_manufacturers
    http://www.jonnyguru.com/modules.php?name=NDArticles&op=Story&ndar_id=24
     
    Last edited: Jan 13, 2011
    bear2790 says thanks.
  3. bear2790

    bear2790 New Member

    Joined:
    Aug 1, 2008
    Messages:
    206 (0.06/day)
    Thanks Received:
    22
    excellent, and thanks :)

    I especially liked JohnnyGuru's website, which one of your links led me to
     
    Last edited: Jan 13, 2011

Currently Active Users Viewing This Thread: 1 (0 members and 1 guest)