Those are the entry level Core 2 chips of intel. They are essentially and Allendale with halve the cache. They were guessed to run around the speed of a stock X2 3600 but if thats so even if they are faster AMD would be a better choice.
Yes it's the entry level chip but it still packs quite a punch. I'd take it over a x2 3600+ ANY day. It's better than the 3600 @ stock speeds and destroys it when they are both overclocked. Honestly I don't know why people keep recommending the 3600 ??