Different speed on task manager and cpu z?

[MILTONIHADES]

why is the processor speed on task manager and cpuz are different also in AMD overdrive core 0 and 1 is 3893Mhz and core 2 and 3 is 1901Mhz? this is strange.

see Picture below

 

[leo2kp]

If you add up all the individual core frequencies and divide by 4, you get an average of about 2.8ghz which is similar to what Windows is reporting. To save on power when not under load or if temperatures hit a certain point, the CPU will pull back its multiplier and voltages. I'm guessing that the two cores reporting 1.9ghz are brought there because that's what it takes to bring it to 50% load to match the two higher speed cores. If your cooling is decent, turn off Cool'n'Quiet or any other power-saving technology in the BIOS, set Windows Power Options to High Performance, and all cores should run at 3.9ghz 100% of the time.

 

[MILTONIHADES]

If you add up all the individual core frequencies and divide by 4, you get an average of about 2.8ghz which is similar to what Windows is reporting. To save on power when not under load or if temperatures hit a certain point, the CPU will pull back its multiplier and voltages. I'm guessing that the two cores reporting 1.9ghz are brought there because that's what it takes to bring it to 50% load to match the two higher speed cores. If your cooling is decent, turn off Cool'n'Quiet or any other power-saving technology in the BIOS, set Windows Power Options to High Performance, and all cores should run at 3.9ghz 100% of the time.

i forgot to say that i already turn off cool n quiet and all power saving option in bios, i also turn off the turbo because i want it running only @3.9Ghz or 4.0. my cpu cooler is cm poseidon 120v+

 

[leo2kp]

If you haven't already, set Windows Power Options to Performance. Default setting is Balanced. That might help too.

 

[MILTONIHADES]

If you haven't already, set Windows Power Options to Performance. Default setting is Balanced. That might help too.

i already set it to high performance and i decided to go for 4.1Ghz but this happens under stress(prime95 small ftts). see the picture below

the speed in task manager is different in the cpu z also the utilization.