In my experience, a non-OC 2MB cache E4300 like the one you own will not be much faster than a Pentium D 3.4Ghz folding wise. Unless you overclock it, but I guess your dell mobo can't do?

The SMP client is really benefiting from the cache size, I can fold the same project on E6600 (4M cache) in 10 mins per frame while my E6400 (2MB cache) is doing 20-ish mins. Both machines are OCed at about the same clock.

Glad you find the guide helpful, Arachne and al53A.