the wattages isnt as important as the output current. if you look at your power supply it will say +3.3V@30A, +5V@32A, +12V@35A, -5V@0.3A, -12V@0.8A, +5VSB@2A or something like that. that is the power output. amd processors use the 12volt line, usually, and thats what is plugged into your motherboard. the video cards run on 5 volt, and thats the 4 prong connector, usually this is where there isnt enough output in amps (=current). so your power supply is probably rated lower, giving you less plugs.
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