There is a base speed, but, often under load, a higher turbo speed will be automatically engaged...
Nothing to be gained or certainly 'fixed' by attempted tinkering/changing of options within MSCONFIG ...as you only have 4 cores/8 threads, disabling half your threads is not advised...
The single-core max turbo of the 6700HQ is 3.5 GHz, so, something less than that will be what is achieved during an all-core/heavy sustained load... (~3.2 GHz might be normal)