EggXpert

Ok if its one thing I learned since i joined is that you guys on this site r a great goup of ppl and ever since I did my build last feb, and when ever i had a question, problem or anything you guys have always come to the rescue.. So i would like to begin by saying thank you and helping out a dummy like me... lol  So here is my problem ...

I am building a new computer and want to get a q6600. I have heard that their are two types, but honestly I have no idea what the difference is. Can anyone enlighten me?