27" iMac with an i3 -Processor upgrade?

[lcseds]

I have a four month old iMac 27" with the i3-3.2GHz. I guess this is a Lynnfield processor. What can I swap into this machine? Not sure if the heat sinks change on iMacs between i3, 5, 7 processors. Can anyone give me some specific chip recommendations to boost performance on this system.
The install is not a problem. thanks.

 

[TMRaven]

It has a clarkdale processor. You can most likely only swap it for another clarkdale processor. In theory you should be able to use a lynnfield as well, but I have heard some unsuccessful attempts at upgrading from clarkdale to lynnfield.