Case/power supply question

I'm currently building a computer (trying, anyway). I've come across a Chieftec case (Model DH-01B) that includes a 450W power supply. The description says "AMD approved"; however, my processor is a P4. Can this power supply also be used with P4 processors, or is it proprietary to AMD?

A related question: I also found an Antec SLK3700AMB that comes with a 350W PS. Would that be enough for a P4 2.53 system? As you can see, I'd really like to find a way to save the $50-75 I'd spend by purchasing a separate PS.

Thanks in advance!

is 300 watts enough for a P4 ? The box says (p4) on it so I assume it is. Just wanted to make sure.

buy a big fat high wattage power supply, the highest/best you can afford. that will keep you happy for a long time even if you upgrade your toys every 2 months.

Enermax and Antec are pretty darn good and silent

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PMFJI, but I'm building a PC from scratch for the first time in a couple years. I already have the case and the Asus motherboard [P4S533-E] should be delivered tomorrow, so I've been reading the docs online today.

My question is on the power supply connectors. Used to be there was just one for the motherboard, but my new power supply has the standard ATX connector and a smaller P6 connector and a square 12v one.

Just making sure - I plug both the ATX *and* the square 12v connector into the board? And the P6 connector is for AMD boards or something else?

Odd, but the docs I've been reading (downloaded pdf) don't go into any detail on this, and neither does the little primer on this website.

Thanks for your advice,
Tom