I have the 4800+ and am using the Zalman CNPS7000B-Cu on it. Temps
are in the 35C range. It actually runs pretty cool and is very quiet.
I also have another machine with a single core 3500+ in it, which I
think is actually hotter. At any rate, I found that the stock AMD
cooler does fairly well with temps in the 38c range. (I'm actually
using a Zalman FAN MATE 2 to slow down the fan a little to reduce
noise.)
Both motherboards are the Asus A8v Deluxe, but I doubt that makes too
much difference.
Regards,
Larry