SmilingCrow:
You're absolutely right, I should have said they are poor compared to the versions with larger L2 caches. Whether this is important will depend on your other hardware, the games you play and the resolution that you run them at.
Depends on the games tbh. CPU intensive games like Supreme Commander and RTS such as Company of Heroes have a 5-10% difference in frame rates, clock for clock (both at 3GHz), when you compare an e2160 (1MB cache) Vs an E6600 (4mb cache).
Games such as Doom 3, FEAR, Far Cry, almost no difference. (I noticed no difference in FEAR in minimum, average or maximum frame rates).