I'll only use a 12V 500Watt PC power supply (I got it today, I have to convert it), as 500Watt is enough for the coming years. Maybe I'll get a 1000+W power supply in the future, but for now it is not necessary.
pc power supplys are rated with all channels driven, the 12v rail is only a portion of the 500watts
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It's "Dr. _paralyzed_" actually. Not like with a PhD, but Doctor like in Dr. Pepper.