Power Supply question... Please help!

By Blackjack · 9 replies
Oct 20, 2006
  1. Hey everyone,

    I'm just buying new parts for a home-made computer. I can't find a PSU that has enough watts to power these parts :

    AMD Athlon™ 64 FX-62 Dual Core Processor

    NVIDIA nForce 590 SLI Motherboard

    XFX PVT71JYHE9 Geforce 7950GT 512MB 256-bit GDDR3 PCI Express x16 HDCP ExTreme Edition Video Card

    I don't know how many watts a PSU should have to power those parts, and more (SDRAM, hardrives, etc.).

    Please Tell me how many watts i would need, and where a good site would be to buy one. Or, Reccomend a PSU for a good gaming computer.

  2. smore9648

    smore9648 TS Rookie Posts: 697

    Look for 400-500 watt PSU.

  3. smore9648

    smore9648 TS Rookie Posts: 697

    There is more to a power supply then that. Just let me know how technical you want me to get;)
  4. dmill89

    dmill89 TS Guru Posts: 475

    For finding watts this will help: http://www.extreme.outervision.com/psucalculator.jsp
    however the amps on the 12v rail is extremly important. There also other factors such as brand,build quality,accuracy of rateing etc. Look for a powersupply from one of the following brands: Antec,Enermax,FSP,PC Power & Cooling
  5. Blackjack

    Blackjack TS Rookie Topic Starter Posts: 62

    Yeah, sure. get Techincal. I want a PSU that won't fry my Motherboard. I want something that will be able to power Those parts.
  6. Blackjack

    Blackjack TS Rookie Topic Starter Posts: 62

    Well, I just looked it up. How about a

    ENERMAX All in One Noisetaker Series EG701AX-VE SFMA(24P) ATX12V 600W Power Supply - Retail

    Dual +12V: Yes
    Efficiency: 80%
    Fans: 2
    Hold-up Time: 17ms at 115VAC or 230VAC, full load
    Main Connector: 20+4-Pin
    Modular Cabling Support: No
    Over Voltage Protection: +5V: 5.5V~7.0V +3.3V: 3.76V~4.3V +12V1 & +12V2: 13.4V~15.6V
    Overload Protection: 110~160% of max load
    PFC: Active
    SLI Support: NVIDIA SLI Certified

    Would that do it? It's $129. At Newegg.
  7. dmill89

    dmill89 TS Guru Posts: 475

  8. dmill89

    dmill89 TS Guru Posts: 475

    Yes that will be good for now but It won't handle another 7950Gt if you decide to upgrade to an sli setup later on.
  9. smore9648

    smore9648 TS Rookie Posts: 697

    Check the following specifications when looking for a PSU.

    Efficiency- Should be between 65-85%.

    Holdup time- Look for the value range between 15-30 milsec, The higher the better) This allows your system to remain running after a power outage. Obviously this is not a replacement for an UPS. Just a safety feature

    Ripple (aka NOISE)-A good power supply has 1% or less ripple rating.

    MAX LOAD-The highest AMP that can be safely delivered to each device.
    -3.3v,-5v AND 3.3v, 5v and 12v

    MTBF- This is the life expectency of your PSU. A good PSU will have 100,000 hours or more

    Line Regulation-Look for 1% or less.

    Transient Response- (Excess transient Voltage results in system errors and lockups.
  10. Tedster

    Tedster Techspot old timer..... Posts: 6,002   +15

    there are several good websites with PSU calculators. Just google it. As a rule of thumb, add 30% more for cushion. PSUs degrade over time.
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