At least use it to make sure you've flashed to a firmware the supports the 45nm Core 2s, because if you do OC it you're probably not going to do much better with a C2D unless you go with something like an E8400.
Seriously, I'm right at 3GHz prime stable with the stock cooler and I haven't even touched the voltage with an E2160 I'm playing with before I give it to my parents.