Just finished sifting through the F@H official forums and found out a a couple of things. I am not 100% certain of any of these and haven't tested them myself so do not rely on this as some of the users in those forums seemed dumb, not all of them, just a few.
1) F@H Folds faster in Windows than it does in Linux as the client was optimized for Windows.
2) Regarding folding on a P4 w/HT: I gathered that running a single client seems to fold faster than two clients. (Per 1 CPU)
If anybody else finds (if they have time

) any relevent information regarding F@H help us all out and post it