The X3220 is the same as the Q6600(1066FSB) is 65NM and has 8Meg Cache. The Q8200(1333FSB) is 45NM with 4Meg Cache.
I have the X3350 It is the same as the Q9450.
Look at the benchmarks between the Q6600 and the Q8200. Then you will know what one is better. Just because it is a Xeon does not make it a better overclocker or faster then the Q2Q equivalent.