400psu enough for this setup

That wouldn't matter. But, that PSU comes with the case, and those typically are pretty bad. I wouldn't even bother plugging it up; just get a nice aftermarket one. You won't regret it.
 
Yes, that 400W PSU should fare well with those components, they don't suck up that much power anyhow.
 
This one PSU, 550W's with 18Amps did well in my Nforce 3 250GB Chipset (last year) I got 1.8GHZ to 2.55GHZ (1.4V to 1.7)
 
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