Although it would work, I would get something slightly bigger. If you choose to stay with the CX430, don't heavily overclock/vmod the card.
Originally Posted by TwoCables
It means that it should be able to deliver 430W continuously. If it were a 430W peak-rated unit, then it would probably only be able to deliver 430W for like 30-60 seconds (give or take a few). So, if you had a 550W peak-rated unit and a 550W continuous-rated unit side-by-side, then you would end up noticing that the unit with the continuous rating of 550W has a much larger capacity.
Usually it's much less (but of course it depends on the unit), like anywhere between 1ms - 2 seconds.