The early Intel-based i Macs also had a socketed CPU and there are a couple C2D CPU upgrade reports here on those.) This page has pre-2009 model Mac Mini owner comments on Core 2 Duo (and some Core Duo) CPU upgrades as the (2006-2008 mfg) Intel-CPU Mac Mini has a CPU socket on the logic board (as did early Intel-based i Macs).
Since I had an extra 1.83ghz Core 2 Duo CPU laying around I decided to upgrade the CPU.
Replacing the CPU was fairly quick as this was my third time doing this type of upgrade.
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.
-Nick"(from 9/26/2013 mail) Installed a used 1.83Ghz Core 2 Duo T5600 in my wife's Mac Mini Core Solo and upgraded the RAM to 2.0GB. Today I upgraded my Mac Mini Early 2006 1.66GHz Core Duo to a used 2.16GHz Core 2 Duo T7400. I had a difficult time getting the pins out of this Mini.