"The Intel Q6700 is almost double the price of Q6600.  You'd be better off investing a few bucks in a better cooling solution and do a mild overclock to get the same performance as the Q6700.  For VUE, best to go for stability when you have a choice between speed or stability".

  With  Q6700, the CPU multiplier is unlocked, meaning you can increase it. Non extreme chips, like the Q6600, are multiplier locked, meaning you can only decrease the stock multiplier, and not increase it. Increasing the multiplier can be desirable in that it offers an almost effortless overclock, and your RAM isn't affected(Meaning more stability with Q6700). You're also not bound by your motherboard's ability to run a higher base frequency (commonly referred to as a frontside bus, or fsb).
The prices are down for both any way....[

http://www.dailytech.com/article.aspx?newsid=7293](http://www.dailytech.com/article.aspx?newsid=7293)