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What Wattage Power supply to use?

Hello Tom's Hardware members!
I'm new to the forum but I have build a few computers before. Today my question is, do I have a good selection of hardware for a new build? Things have changed a bit since I build my last pc about 5 years ago.
Heres what I've chosen so far:

CPU http://www.newegg.com/Product/Product.aspx?Item=N82E16819115072]
I'm going with i5 because its cheaper and is said to still be great for gaming. i7 is out of my budget.

RAM http://www.newegg.com/Product/Product.aspx?Item=N82E16820231455]

Motherboard http://www.newegg.com/Product/Product.aspx?Item=N82E16813157271]

GPU http://www.newegg.com/Product/Product.aspx?Item=N82E16814127578]

Also, if I use these components, what wattage power supply do I need? I don't want to over spend by getting one that has more than I need.
9 answers Last reply Best Answer
More about what wattage power supply
  1. 550w+ w/ at least 40a on the 12v rail

    for SLI look at 700w+ w/ 50a+ on the 12v rail
  2. For a system using a single GeForce GTX 560 Ti graphics card NVIDIA specifies a minimum of a 500 Watt or greater power supply that has a combined +12 Volt continuous current rating of 30 Amps or greater and that has at least two 6-pin PCI Express supplementary power connectors.

    For a system using two GeForce GTX 560 Ti graphics cards in 2-way SLI mode NVIDIA specifies a minimum of a 700 Watt or greater power supply that has a combined +12 Volt continuous current rating of 52 Amps or greater and that has at least four 6-pin PCI Express supplementary power connectors.

    Overclocking of the CPU and/or GPU(s) or being able to run FurMark or some equivalent GPU stress testing utility will require an additional increase to the combined +12 Volt continuous current ratings, recommended above, to meet the increase in power required for the overclock and/or GPU stress testing. The additional amount needed will also depend on the magnitude of the overclocking you are trying to achieve.
  3. Since it's a factory OC'd card and I can only assume you are gonna crank it up some more, ..... and assuming you are gonna OC the 2500k also, I'd use a quality 850 watter.
  4. @dirtyferret is that 40a total?

    @JackNaylorPE Probly not going to touch the Video card seeing as how those frequencies are oc'd already. I want to stay on the safe side on that one. The CPU however I probably will overclock a good amount or at least what a Cooler Master H 212 will allow.
  5. Best answer
    sonyz92 said:
    @dirtyferret is that 40a total?

    @JackNaylorPE Probly not going to touch the Video card seeing as how those frequencies are oc'd already. I want to stay on the safe side on that one. The CPU however I probably will overclock a good amount or at least what a Cooler Master H 212 will allow.


    yes 40a on the 12v rail be it single or split

    even with an OC intel i7 CPU, you won't break 400w gaming

    Test System Specs
    - Intel Core i7 920 (Overclocked @ 3.70GHz)
    - x3 2GB G.Skill DDR3 PC3-12800 (CAS 9-9-9-24)
    - Asus P6T Deluxe (Intel X58)

  6. So to be on the safe side and leave room for upgrades I'm thinking 550-600W? I have a one of those clear Apevia power supplies 500W right now don't like it its really loud. I want too look for the quietest one possible.
    I found this http://www.newegg.com/Product/Product.aspx?Item=N82E16817341017] Good enough to run OC Vid card and i5 2500k?
  7. there are a lot of good PSU in that range, just a few of the top of my head

    PC Power and Cooling 600w
    Antec true power new 550w
    Seasonc 520w
    OCZ ZT 550w
  8. Thank you very much for helping me and giving me the info I needed. I've got an idea of what I need now.
  9. Best answer selected by sonyz92.
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