total power and max power??

I'm pretty sure that means it can push out 420W but it can't sustain it. 350W is the max draw it can handle full time.
 
420w is more of a, "Please don't fail if I need this for a very short amount of time". 350w is maximum sustained output.
 
Cromewell and diduknowthat are correct. It can sustain 350W, and deliver up to 420W for short periods (usually less than a minute).
 
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