Crossfire PSU?

Hey i currently own 1 hd 7770 and im thinking of adding a second and my motherboard does allow it.
so m power suply is a 500watts do i need to upgrade it to 600-750 watts?
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  1. Each 7770 is 80W max.

    Not knowing your current rig or how hard you OC it's hard to guess your PSU requirements. However TWO x HD7770 uses less power than my one X GTX260 rig powered by a reasonable quality 460w PSU. So if 500W PSU is a good one, not you shouldn't need a bigger PSU.

    edit: also google microstutter.
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