PSU requirements for radeon hd 7770 graphics card crossfire?

my rig is

intel core i5 2500k

8gbs of ram

seasonic X650 power supply
both of the cards are the Sapphire Vapor-X radeon hd 7770 GHz edition. will i have enough head room?
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More about requirements radeon 7770 graphics card crossfire
  1. An 500W could handle those components easily.

    The HD7770 would draw like under 100W Max.
  2. For a system using two Radeon HD 7770 GHz Edition graphics cards in 2-way CrossFireX mode AMD specifies a minimum of a 600 Watt or greater power supply. The power supply should also have a combined +12 Volt continuous current rating of 30 Amps or greater and have at least two 6-pin PCI Express supplementary power connectors.

    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 @ 45-50°C ambient temperature, is the most important factor.

    The Seasonic X-Series 650W, with its combined +12 Volt continuous current rating of 54 Amps and with four (6+2)-pin PCI Express supplementary power connectors, is way more than sufficient to power your system configuration with two Radeon HD 7770 GHz Edition in 2-way CrossFire mode.
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