45w or 65w powerbook mains power adaptor?

[G4Alex]

Hi,
I have a 1.67 Ghz, 1gb ram 15inch powerbook. I need a new mains power adaptor as mine is pretty well had it. I've looked around on the web and am not sure if I need a 45watt or 65 watt adaptor. Does it make a difference? Excuse my ignorance, any help would be appreciated.
Thanks!
I'm based in the UK.

 

[deadpixels]

the 15" and 17" use the 65w power adapter, info taken from MacTracker

 

[sjb]

My 1.5GHz 15in PowerBook has a 65W power adapter.

 

[G4Alex]

thanks for the responses, 65 watt it is then!