Kurtis, you'll get some decent numbers from those CPUs I would think.
I have an 8800GT folding up to 10 hours a day (usually 3-4), an Athlon 64 3200+ folding 3-4 hours a day, and one core of an Athlon 64 X2 3800+ folding a few hours a day.
If I was folding 24/7 I could do a lot more, but that's not happening unfortunately.