Power supply need for this build? HELP

what kind of power supply do i need to run this?

haf 922 case

i5-750 overclocked to 4.0 ghz stable

asus p7p55d motherboard

4gb (2x2) g skill eco ddr3-1600 ram (planning to overclock from the 1.35v to 1.5v)

xfx 5850

640gb 7200rp hd

24x dvd burner/reader

corsair p50 cooling system

x2 12" cathode rays

x3 120mm led fans (total including case fans)

x2 200mm led fans (total including case fans)

i have done my research and came up with this power supply...

http://www.newegg.com/Product/Product.aspx?Item=N82E16817139012

will this 650w be a great power supply for this build, keep in mind overclocking ram and the cpu.

this is corsair so supposidly its rated better than it says, wattage wise.

i want to know if this power supply will be great for this build, and be good eonugh to have another 5850 added down the road in crossfire. but, if i dont decide to get another one...will this 650w be too much power? is that possible?


Thank you!
6 answers Last reply
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  1. a good choice, though im not sure i would trust it for crossfire.

    its plenty for your current build, but i think you should get a 750w if you wish to add another card.

    corsair are one of the best though, so stick with them.
  2. I agree with welsh - go with a 750w for CF and OC.

    You might also run the calculator linked below. It includes some small reserve built in - I suggest adding another 10-20% since to allow for upgrades, since PSU's are most efficient and quiet when not near capacity, and because their power decreases with age.

    http://www.extreme.outervision.com/psucalculatorlite.jsp
  3. AMD requires 600w and 4 6-pin pci-e connectors for crossfire 5850 cards:
    http://www.amd.com/us/products/desktop/graphics/ati-radeon-hd-5000/hd-5850/Pages/ati-radeon-hd-5850-system-requirements.aspx

    You are OK on the wattage, but short on the connectors. Using molex to 6-pin adapters might be OK, but I think the 750w which had 4 such connectors unit would be better if you are planning on a second 5850.
  4. geofelt,
    It has the necessary connectors:
    "Spec
    Type ATX12V v2.2 / EPS12V 2.91
    Maximum Power 650W
    Fans 120mm double ball-bearing fan
    PFC Active
    Main Connector 20+4Pin
    +12V Rails Single
    PCI-Express Connector 4 x 6+2-Pin
    SATA Power Connector 9"

    It's the minimum that I would use for 2 video cards.
  5. jsc said:
    geofelt,
    It has the necessary connectors:
    "Spec
    Type ATX12V v2.2 / EPS12V 2.91
    Maximum Power 650W
    Fans 120mm double ball-bearing fan
    PFC Active
    Main Connector 20+4Pin
    +12V Rails Single
    PCI-Express Connector 4 x 6+2-Pin
    SATA Power Connector 9"

    It's the minimum that I would use for 2 video cards.

    OOPS! I stand corrected. I was thinking the 650TX.
  6. You should be fine with the Corsair HX650 power supply. It is a newer model with one large +12 volt rail rated at 52 amps.

    One of the good things about the new ATI 5000 series cards is they require less power. Two years ago I would have been recommending a 750 watt power supply for two video cards operating in dual mode.
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