[H] HP laptop power requirements

[Thane Sherrington]

I've noticed this on a lot of HP laptops - they list two power 
requirements on the bottom.  The one I'm looking at today lists:

18.5V, 3.5A
19V 4.7A.
So any idea which is the correct one?

It's a Pavilion DV7-3079WM, but I've seen this on a lot of models.

According to HP's website, it comes with a 90W adapter, so maybe it's 
the second.

Man, I hate HP.

T