Recently installed a new Crucial Mx100 SSD (512GB) on my late 2011 MBP with 8 GB RAM. Did a clean install of Yosemite along with clean install of apps. During the install, I did the default 'enable FileVault." No problems with install. However, I noticed that during boot up, the fans will kick on each time and cut off once home screen was done loading apps etc. I may be wrong here but, it seems that the fans run a little more often with Filevault 2 turned on. Has anyone else experienced this? As a temporary test, I turned off FileVault, and the fans haven't turned on at boot. I am just curious why the fans would need to come up with the former. Is it normal?