Expect good results wit stacked pelts. I currently have a 1.8ghz @ 2.3ghz,... its pretty happy on the stacked pelts,... giving it stable about -20 c... dunno what you'll get wit a p3 coppermine,... but i've seen an air cooled tulatin 1.
2ghz @ 1.65ghz,... and thats wit a 183 fsb,....
if you wanna see tulatins,...
Tualatin 1.2ghz
P.S. if you wanna read the article,... you might wanna bust out the good ole' babblefish out on altavista