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What will be the rest of the spec? What will the machine be doing?
I cant see that card drawing much power. I'm not sure how much power an AGP slot provides but the card doesn't need an additional power connector.
you can get a 5450 pci (thats PCI not PCI-e) card, these should allow you to play full hd stuff on an old pc too.
They are either passive or have a tiny fan, they also don't use any external power connectors, they probably don't use more than ~20W, the 350W will be a copy+paste from something else.
If they did it as AGP, it would only work in ancient AGP computers, as PCI it can work in old and new as long as the motherboards still come with normal PCI slots.
The only downside is they are twice the price of the PCI-e version and they really are terrible for gaming.
Also this should work, but good luck finding one
http://www.asus.com/Graphics_Cards/AH3450DI512MD2LP/
Edit: On the HIS site it shows the 4650 supports it as does the 4350.