Most modern games do stress the CPU so I would say yes. Also, things like rendering, encoding, compressing and decompressing push the CPU to work hard which would activate the Turbo Boost feature.
As was mentioned by Sakkura, Turbo Boost is enabled by default. Turbo Boost dynamically changes the clock speeds of the CPU cores depending on the demand on the CPU. There are several programs out there that let you see these changes in real-time.
Most modern games do stress the CPU so I would say yes. Also, things like rendering, encoding, compressing and decompressing push the CPU to work hard which would activate the Turbo Boost feature.