frequency-info question

[jd1008]

First, the command and it's output:
# cpupower -c all  frequency-info
analyzing CPU 0:
   driver: acpi-cpufreq
   CPUs which run at the same hardware frequency: 0
   CPUs which need to have their frequency coordinated by software: 0
   maximum transition latency: 10.0 us.
   hardware limits: 1.20 GHz - 2.67 GHz
   available frequency steps: 2.67 GHz, 2.67 GHz, 2.53 GHz, 2.40 GHz, 
2.27 GHz, 2.13 GHz, 2.00 GHz, 1.87 GHz, 1.73 GHz, 1.60 GHz, 1.47 GHz, 
1.33 GHz, 1.20 GHz
   available cpufreq governors: conservative, userspace, powersave, 
ondemand, performance
   current policy: frequency should be within 1.20 GHz and 2.67 GHz.
                   The governor "userspace" may decide which speed to use
                   within this range.
   current CPU frequency is 2.67 GHz (asserted by call to hardware).
   boost state support:
     Supported: yes
     Active: yes
     2200 MHz max turbo 2 active cores
     2400 MHz max turbo 1 active cores
analyzing CPU 1:
   driver: acpi-cpufreq
   CPUs which run at the same hardware frequency: 1
   CPUs which need to have their frequency coordinated by software: 1
   maximum transition latency: 10.0 us.
   hardware limits: 1.20 GHz - 2.67 GHz
   available frequency steps: 2.67 GHz, 2.67 GHz, 2.53 GHz, 2.40 GHz, 
2.27 GHz, 2.13 GHz, 2.00 GHz, 1.87 GHz, 1.73 GHz, 1.60 GHz, 1.47 GHz, 
1.33 GHz, 1.20 GHz
   available cpufreq governors: conservative, userspace, powersave, 
ondemand, performance
   current policy: frequency should be within 1.20 GHz and 2.67 GHz.
                   The governor "userspace" may decide which speed to use
                   within this range.
   current CPU frequency is 2.67 GHz (asserted by call to hardware).
   boost state support:
     Supported: yes
     Active: yes
     2200 MHz max turbo 2 active cores
     2400 MHz max turbo 1 active cores
analyzing CPU 2:
   driver: acpi-cpufreq
   CPUs which run at the same hardware frequency: 2
   CPUs which need to have their frequency coordinated by software: 2
   maximum transition latency: 10.0 us.
   hardware limits: 1.20 GHz - 2.67 GHz
   available frequency steps: 2.67 GHz, 2.67 GHz, 2.53 GHz, 2.40 GHz, 
2.27 GHz, 2.13 GHz, 2.00 GHz, 1.87 GHz, 1.73 GHz, 1.60 GHz, 1.47 GHz, 
1.33 GHz, 1.20 GHz
   available cpufreq governors: conservative, userspace, powersave, 
ondemand, performance
   current policy: frequency should be within 1.20 GHz and 2.67 GHz.
                   The governor "userspace" may decide which speed to use
                   within this range.
   current CPU frequency is 2.67 GHz (asserted by call to hardware).
   boost state support:
     Supported: yes
     Active: yes
     2200 MHz max turbo 2 active cores
     2400 MHz max turbo 1 active cores
analyzing CPU 3:
   driver: acpi-cpufreq
   CPUs which run at the same hardware frequency: 3
   CPUs which need to have their frequency coordinated by software: 3
   maximum transition latency: 10.0 us.
   hardware limits: 1.20 GHz - 2.67 GHz
   available frequency steps: 2.67 GHz, 2.67 GHz, 2.53 GHz, 2.40 GHz, 
2.27 GHz, 2.13 GHz, 2.00 GHz, 1.87 GHz, 1.73 GHz, 1.60 GHz, 1.47 GHz, 
1.33 GHz, 1.20 GHz
   available cpufreq governors: conservative, userspace, powersave, 
ondemand, performance
   current policy: frequency should be within 1.20 GHz and 2.67 GHz.
                   The governor "userspace" may decide which speed to use
                   within this range.
   current CPU frequency is 2.67 GHz (asserted by call to hardware).
   boost state support:
     Supported: yes
     Active: yes
     2200 MHz max turbo 2 active cores
     2400 MHz max turbo 1 active cores

=========================

So, question:

How can current frequency be 2.67GHz, but
turbo ferequency for one cpu running be 2.4GHz?
How can that be turbo???