How do i turn on turbo boost?

You can not turn this feature on or off.

Turbo Boost comes on automatically if or when the program you are using needs more power.

Here is an article from Intel about Turbo Boost and how it's 'on demand' boost works.

Clinton

you cant turn it on, its automatic: http://www.apple.com/imac/performance.html,http://www.intel.com/content/www/us/e n/architecture-and-technology/turbo-boost/turbo-boost-technology.html