I just installed a Corsair Force 3 in my EMC 2133 20" iMac 2.0 ghz C2Duo, 4 gb DDR2 667 MHz. Seriously doubled my performance!! No lie! Was very easy to install. Lion runs so fast now!! The thermo sensor is not that bad except you do need to tape it to the drive. Other than that, It's up to you to secure it in the 2.5" drive in the 3.5" opening. I basically have it screwed in using the bottom mounts. I figured it's pretty stable considering it's a stationary computer. You will not be disappointed with this upgrade!