j2j663 :
And yet this is the beauty of AMD, that we can even have conversations about simply upgrading a CPU. Not trying to upgrade a CPU a motherboard and whatever else Intel has stopped supporting in the 2 years it has taken your pc to get "old".
You'll say this when you try to slap Bulldozer into an old board and it doesn't work or has crippled performance. Sometimes you have to ditch legacy sockets to make changes (LGA775 to 1156 for example, but not so much 1156 to 1155). AMD has as much to gain from encouraging new motherboard purchase as Intel. Every corporation is motivated by greed, not love and hugs from the fans. ^^
Current gen Phenom chips are (in my opinion, anyway) not worth it considering that something new is around the corner. The OP might be better served by waiting for Bulldozer, or will have to just upgrade again in the near future. The dinosaur comment was out of hand, but even the latest Phenom (short of the x6) chips are only about on par in most cases with the Core 2 Quads from yesteryear.
To even match the newest Sandy Bridge stuff from Intel you'd have to overclock by a silly amount. What's the point of running a chip to the breaking point to compete with a chip that outperforms it at lower speeds? Are we back in the Pentium 4/Netburst days? Bulldozer will change that, but that's the status of it at the moment. I'd wait for Bulldozer if I were the OP, save my cash, and see what rolls out.
This comes from someone who has various builds from both AMD and Intel.