April 2014 - 2 years later : now running OS X 10.9 Mavericks successfully with zero issues.April 2013 - 1 year later : This system has been absolutely ROCK SOLID with no crashes, no kernel panics and no freezes!.If you upgrade or change the HD, you will need to buy HDDFanControl software to control the HDD fan which will run at full speed otherwise.Update : Removed the 3Tb SATA drive and replaced with 512Gb SSD and upgraded to Mountain Lion 10.8.I used this guide for disassembly and reassembly.Īlso added a 3TB SATA drive and 32Gb of RAM to max out this system under Lion 10.7 Upgrade mid 2010 27 inch Apple iMac from a Core i3 3.2GHz (Dual core) to Core i7 2.93GHz (Quad core) processor.
