Can you recommend me a suitable power supply for these specifications?

Osama Javaid March 13, 2012

I want to purchase a power supply for my PC. The current power supply in my PC is some cheap local made power supply and I think the 650W written on it is false because I only purchased it for $16, while a 500W power supply on is around $50.

I have these specs :

Intel Core i3-2100 GHz
2 GB DDR3 nVidia GT430
DVD+RW Optical Drive
Western Digital 250GB Hard Drive

What would be the required wattage/voltage for these specs and the best brand to go for?

  1. Smayonak
    March 15, 2012 at 11:45 pm

    According to your specs (and in the PSU calculator), your suggested wattage pull is something like 250 watts, unless I added it up incorrectly.

    However, everyone likes going big with PSUs for various reasons nowadays (in case you go with multiple GPUs ala CrossfireX or SLI). You may want to look at these power supplies: 

  2. Anonymous
    March 14, 2012 at 12:16 pm

    well perhaps 650W will yield only 75% and neweg 500W will yield perhaps 90%, also depends on material used, so you have to see the real yield of power supply.

    if you use pc for hard gaming... then 650W  with 90% of yield is quite enough.

    • Osama
      March 14, 2012 at 7:15 pm

       how can i check the actual yield ?

      • Anonymous
        March 14, 2012 at 8:19 pm

        Don't know how to calculate the real one i think it depends on the manufacturere and physicam measurement.

        A certified power supply "80 Plus" is a guarantee of good performance: it corresponds to the power supplies can exceed 80% efficiency over a load range from 20 to 100% of their maximum power. Logos  80 Plus Bronze, Silver, Gold and Platinum, for power capable of achieving better.

        a PC with a Core i5 661 and a HD 5770 consumes about 80W at idle and 220W at full load.
        A  PC with a Core i5 2500 and GTX 560 Ti graphics card consumes about 300W, and a PC consists of a Core i7 3960X and a GTX 580 or HD 7970 does not exceed 500W

        In general, a real power of 400W is enough for any entry level PC, a 500/550W enough for a midrange PC, and a 650W sufficient for a high-end PC without SLI or CrossFireX.

        eXtreme Power Supply Calculator Lite

    • Mike
      March 14, 2012 at 8:23 pm

      In general I agree it's better to keep the utilization low because it will result in less heat and "longer" lifetime. But then again, efficiency is usually higher at 70-90% power consumption.

      Also one of my systems hanging on a power meter (Core i7 860, GTX570) draws around 320W at full load hence a 500W would be perfectly fine for the initial components listed including a decent graphics card.

  3. Mike
    March 14, 2012 at 12:58 am

    Well, you can indeed get a 650W power supply for $15-20. To give you one example here is a Alpine 700W PSU for roughly $20.

    The basic reason why known brands are more expensive are
    - the branding
    - higher quality electronics (higher reliability)
    - higher efficiency (less power ergo money wasted in heat)
    - better support and guarantee handling

    Having that said the important information missing is the graphics solutions or graphics card of your system because a dedicated GPU often accounts for 60% or more of the total power consumption.

    Assuming some high-end GPU with ~300W I would say any 500W or more power supply will do perfectly fine for your components. Corsair, Cooler Master, be quiet!, Seasonic, Silverstone, Tagan, Thermaltake... make your pick.

    What you really should focus on are the connectors required taking future upgrades into account:
    - SATA connectors for hard disk(s) and optical drive
    - 4-pin (often called "IDE") for cooling fans and misc.
    - PCIe 6-pin, PCIe 6+2-pin or PCIe 8-pin for graphics card(s)
    - proper ATX, ATX12V and/or EPS12V for the motherboard

    Also for clean cabling you might want to get one with modular cables.
    80 PLUS Bronze or better certification should be standard today.

    • Osama
      March 14, 2012 at 1:53 am

       Thanks for the info

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