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What power supply do I need?

I'm going to build a gaming pc and I'm unsure what power supply to get I'm looking at a Corsair 750w pro, but I'm not 100% help is appreciated.

Spec:
-Intel core i7 3370k.
-Corsair H100i water cooler.
-2 (gtx 660 in sli)
-2 (4gb corsair vengence 1600Mhz memory)
-4 (OCZ agility 3 60gb in RAID 0)
Asus p8z77-v deluxe motherboard.
- Thermaltake Level 10 gt snow edition.


I appreciate the help I think I will stick to the 750w as it seems sensible and I don't really need to much overhead for future upgrades as it is quite future proof. Plus 1000w is a hell of alot.
4 answers Last reply Best Answer
More about power supply
  1. You can use a power supply wattage test to help you choose.

    This one by Asus suggests 950 watts as a minimum required rating.

    This one by Thermaltake suggests 600 watts minimum.

    Personally I would go for 1000 watts, as it allows enough headroom for future upgrading, and because the closer you get to a PSU's maximum rating, the less efficiency it is and produces more heat and fan noise. I cannot find your PSU anywhere, but any Cosair PSU from the HX, TX or AX series get's my thumbs up, as their products and service/customer support has been flawless in my experience for over 5 PSU's now.

    PS. I find that putting SSD's in raid is useless, as you lose TRIM control and don't get much performance increase.
  2. Best answer
    My, you have expensive tastes my friend. I do hope you plan on playing on something bigger and higher resolution than a 1920x1080 monitor.

    Still I think 750 Watts should be fine, and you can check here as well: http://us.msi.com/service/power-supply-calculator/

    Any reliable brand (Antec, Corsair, Seasonic, and Silverstone are all reliable brands) at 750 watts should be fine. Then its just a matter of reading the "bonus" features and choosing to taste. A lot of builders like "modular" PSU, which lets you choose which cords you want to add and leaves to a cleaner case, but they cost more and lower your options. Others really like PSUs with quiet fans, or like PSUs with a great deal of energy efficiency. Anything with the 80+ certification has to pass tests that ensure at least 80% of the electricity taken from the wall goes to powering the computer versus being wasted as heat.
  3. SSD-M4 said:
    I'm going to build a gaming pc and I'm unsure what power supply to get I'm looking at a Corsair 750w pro, but I'm not 100% help is appreciated.

    Spec:
    -Intel core i7 3370k.
    -Corsair H100i water cooler.
    -2 (gtx 660 in sli)
    -2 (4gb corsair vengence 1600Mhz memory)
    -4 (OCZ agility 3 60gb in RAID 0)
    Asus p8z77-v deluxe motherboard.
    - Thermaltake Level 10 gt snow edition.


    Hi - realhardtech(their expertise) suggests a quality 620w PSU for a sys running
    two gtx 660's in SLI. So, a quality PSU in the 620w range (min 36a on +12v rail) is
    sufficient. You might want to consider a 650w unit from a quality brands as there
    is usually deals on the 650's. Quality brands:

    You don't need 1000w or anything close to that. No harm in getting more than 650w,
    except to your wallet.

    Seasonic, XFX, PC Power & Cooling, Rosewill Capstone/Fortress/Tachion series,
    Silverstone, most Antecs, most Corsairs, most Enermax, & a few others.

    An excellent deal on a modular platinum rated unit:

    http://www.newegg.com/Product/Product.aspx?Item=N82E16817182272 nets to $69 after promo & mir
  4. For a system using two GeForce GTX 660 (non-Ti) graphics cards in 2-way SLI mode NVIDIA specifies a minimum of a 600 Watt or greater system power supply that has a maximum combined +12 Volt continuous current rating of 36 Amps or greater and that has at least two 6-pin PCI Express supplementary power connectors. If you have the MSI GeForce GTX 660 HAWK 2 GB, it requires two 6-pin PCI Express supplementary power connectors for each graphics card, so you'll need a total of at least four 6-pin PCI Express supplementary power connectors on the power supply unit.

    Total Power Supply Wattage is NOT the crucial factor in power supply selection!!! Total Combined Continuous Power/Current Available on the +12V Rail(s) rated at 45°C - 50°C ambient temperature, is the critical factor.

    Overclocking of the CPU and/or GPU(s) will require an additional increase to the maximum combined +12 Volt continuous current ratings, recommended above, to meet the increase in power required for the overclock. The additional amount required will depend on the magnitude of the overclock being attempted.
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