Optiplex 330 CPU Upgrade

Can my Optiplex 330 2.2ghz cpu be upgraded from an Intel E4500 cpu to an Intel E8400? My system uses a G31 chipset. If so, will I see a noticible difference in performance? The one thing in comparing the two processors other than FSB, processor speed and cache is the Architecture of the E4500 is 65nm and the E8400 is 45nm. Is this an issue? Any information would be greatly appreciated. Thanks.

My system specs are:

4 gig ram