Will a 400 watt power supply be enough?

I just bought a EVGA GeForce 9800 GT for my PC and, of course, my power supply isn't big enough to run it. (Just a black screen when I power up my computer) I am currently using a 8500 GT and a Pentium 4 3.2GHz processor with a DVD-ROM drive and 2 hard drives and am running it fine on a 300 watt power supply.... show more I just bought a EVGA GeForce 9800 GT for my PC and, of course, my power supply isn't big enough to run it. (Just a black screen when I power up my computer) I am currently using a 8500 GT and a Pentium 4 3.2GHz processor with a DVD-ROM drive and 2 hard drives and am running it fine on a 300 watt power supply. I'm a 17 year old on a tight budget and I don't want to spend more than I have to, so my question is: will upgrading to a 400 watt power supply be enough to run this videocard? And I am also planning on buying a Core 2 Duo E6420 processor within the month, will it be good enough to accommodate that too? And if not, what would?
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