Also, I would recommend reading around on the thermal paste and seeing which of the several recommended ones is available at the best price, I found the ubiquitous 'Arctic Silver' to be quite a bit more expensive than other brands which out perform it in testing. I upgraded to a T7200 2.0Ghz, 2GB of RAM, a Super Drive from a '09 i Mac (it can burn DL DVDs and cost NOS) and a 1TB hard drive. This one is a 2007 and will also be upgraded - T7600 2.33 Ghz processor, 4GB of RAM (mini 2,1 EFI supports up to 3GB usable) and a bigger hard drive. Good luck to all those who want to get the best out of their machines.
If you plan on cloning your old hard drive onto the new one (as I did) then I recommend getting a firewire compatible caddy, as Snow Leopard doesn't always work with USB caddys when you try and format them for some reason - this problem held me up. -Greg (from 10/16/2013 mail - follow-up to previous C2D upgrade report) I recently sent a report on upgrading the processors on two 2006 mac minis with hopes of installing 10.7 at a later date. 26th post below) I finally was able to borrow an OS X 10.7 supported Mac Book and installed 10.7 on an external hard drive.
I did upgrade the firmware so the machines are identified as Macmini 2,1.
I found a couple programs that do not run if the mini was still showing Macmini 1,1. "(from 8/5/2013 mail) Thank you for the possibility to share experience on Mac mini upgrades!
Partition 3 was used to install 10.7 and then apply combo update 10.7.4.
(CPUs in 2009 and later Mac Mini models are soldered to the motherboard.) Sponsor OWC has Mac mini upgrades (ram, drives, etc.) and take-apart guide videos for 2006-2008 Minis and later models.Since this worked, I went ahead and installed the 10.7.5 combo update.This updated restored the platformsupport.plist, but I was able to remove it before restarting the mini.When it came time to install (copy) 10.7.4 to my upgraded 2.16 Ghz Core mini, I created a new partition to clone the 10.7.4 disk image onto.My original install of 10.6.8 is intact and can be booted into anytime for emergency if the 10.7.4 install ever stops working.