CPU frequency jumping

[zJordan]

So I overclocked my i5-6600k to 4.5GHz on an ASUS Z170 Pro Gaming.

 

Task Manager shows it jumping between 4.45GHz and 4.48GHz.

 

I'm a bit confused right now, any BIOS settings I need to tweak?

 

I couldn't find an option to disable CPU Spread Spectrum, but I found VRM Spread Spectrum (which was already disabled) and I set Digi+ power control to Optimised.

 

Thanks.

[MANIDY inc]

It will jump depending on how hard the cpu has to work

[RS2007GOD]

Don't trust task manager. Download HwMonitor

[jj9987]

Task Manager is not a reliable tool for checking that. Use CPU-Z or HWiNFO.

But yes, it is normal, it is called SpeedStep technology (if I am not mistaken). You set the maximum frequency, CPU will decide the frequency depending on the load. Saves energy by not having to run CPU at full speed with no load.

[zJordan]

6 minutes ago, MANIDY inc said:

It will jump depending on how hard the cpu has to work

 

4 minutes ago, jj9987 said:

Task Manager is not a reliable tool for checking that. Use CPU-Z or HWiNFO.

But yes, it is normal, it is called SpeedStep technology (if I am not mistaken). You set the maximum frequency, CPU will decide the frequency depending on the load. Saves energy by not having to run CPU at full speed with no load.

I forgot to mention this is under load during an x264 stress test, I haven't checked if CPU frequency does this in HWMonitor, I will do so now and update.

[ARikozuM]

I've noticed on almost every overclocked system that Task Manager is the first to go south. Download a hardware monitor unless you want to be subjected to errant info.

[zJordan]

Ok, so I ran x264 for around a minute and I don't know if this is normal but my core frequencies will jump between 4521 and 4525, I suppose since it is such a minor increment I suppose it is normal?

 

 

My OC is stable, it has passed 12 hours of x264 and 6 hours of Prime95 (pre-AVX instructions obviously) and also a few hours of Linpack.

 

My voltage is also at 1.320, but ASUS seems to offset this to 1.330, my temperatures are good however. 

[ARikozuM]

It's not stable until you test a few games, but yes, minor increments are normal.

[zJordan]

1 minute ago, ARikozuM said:

It's not stable until you test a few games, but yes, minor increments are normal.

I've had this OC for a few weeks now, not a single BSOD except when I pushed to 4.7GHz, 4.6GHz was stable in everything (including games) until I ran Linpack then it crashed, 4.5GHz seems to be the sweet spot for my voltage. 

 

But anyway thanks, Task Manager made it look like a bigger issue than HWMonitor, will use it from now on!