IGN.com has an article on PC power supply replacement. It shows us how to properly change our current system power supply, in case you would need to upgrade or replace your current PS.
Don't let the potential for disaster scare you away from considering stepping up to a multi-GPU gaming rig, avoiding the problem is as simple as the old motto of being prepared. Unless your computer came with two graphics cards, chances are it has, at most, a stock 650-watt power supply. To run multiple high-end GPUs, now and in the future, you should search for a power supply rated to handle a steady 850- to 1000-watt draw. Both ATI and Nvidia provide lists of manufacturer approved power-supply models that have been certified as prepared to handle the power consumption of Crossfire or SLI. [PC Power Supply Replacement Guide - IGN.com]
Yes, you can replace your system's power supply yourself. It's really not that difficult to do. But if you can afford 2 high-end graphics cards, a 1000-Watt power supply, and most probably a top-of-the-line dual core processor, chances are, you can afford the labor fee in having that power supply installed at the shop. :)
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