A power supply is a power supply right? If you own a "PC in a box" this statement would be true. If you're custom building a hard core gaming system then those twenty dollar power supplies included in your brand X computer will no longer be acceptable. It wasn't long ago when a 500 watt power supply was considered top notch. These days a 500w power supply is at the bottom of the totem pole, especially when it comes to building a gaming system. Today's gaming systems with multiple video cards require a ton of power. Recommendations vary from manufacturer to manufacturer, but a fully configured computer with 1 high end video card requires a 500 to 600 watts power supply at minimum. Again, bare minimum... When you start stacking video cards the wattage requirement can go up significantly. Personally, "minimum" requirements just will not do, so I typically run with a high quality 750 to 800 watt power supply.
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Review: Club OC