Ok all, I know that it has certainly be reported times and times, but I did not find any answer.

I have an "early" imac 20" with a 2.0Ghz cpu. The warranty is about to expire, and I would like to change my dual core cpu with a more powerfull dual 2 core. but the problem is that they all confused me with the name and specifications.
I would like to know what is the cpu name who is in my imac (johna ? memrom ? ...) , what is the socket type (478,479?), what is the cpu type (5500 ? 5600 ? ..) and by which cpu can I change without any problem ? I suppose the more I can put will be a 2,3 ghz ??? but it has to be the same socket type and to not heat too much ?
Any help welcome. Thanks !

Core Duo is Merom I think, and I believe it uses socket 775. So in theory, you could install the new Core 2 Quad. Not seen it done yet though.

I wouldn't change out the CPU just yet. Just up the memory and get a bigger harddrive.

I already have 1.5Go of RAM and 250Go hdd for which I still have 60% free ...
Anyway I just checked the price of a T7600 ...and ouch , it will cost a LOT ! (hope this one is compatible with the imac mobo)

They're expensive chips. That's why I don't see the price of Macs coming down in the near future.

Most PC users get mid range CPUs. Apple trys to go at the top of the CPU chain. It's like when ever Intel releases a new CPU Apple is making a system that will come with it.

I do wonder if the Quad Core chip would need a few extra drivers or something.

intel imacs arent lga775, they're using socket m. same one as the mac mini's. so no core 2 quad extreme lovin' for you.

you can max out with a core 2 duo 2.33ghz for roughly $500

Fair enough, that was an assumption on my part. Are any of the Core(2) Duos socket 775? Odd they would use more than one type for one chip.

Look at AMD they make chips with so many socket types.