A core2quad would be a cheap upgrade, the Q6600 can be found around 20$ on ebay. If you go with the top end Core2Quads, they are simply too expensive to be worth it. I have seen them around 100$. Like ypu one of my computers is LGA775 and I wanted to find a cheap upgrade to my Q6600... I decided not to do it, spending 100$ to get a 30% speed boost on an obsolete computer was not worth it for me.