my pep has always performed about 1-3C(a few degrees F) better than the Pal6035(not the pal35T, but for all purposes roughly the same)..
I had a delta 30CFM fan on my PEP66.
This is not to say that hte Arcticooler is bad... It is a marvelous little heatsink. But one thing I have noticed, that when i disable my fans at night, my alpha's consistently keep the cpu colder than the arcticooler(usually by about 3C difference if all my case fans are turned down).
Oh, And one more reason for the differences in our temps could very be that i'm running a 650E @ 982 @1.85 volts.
Mike