I7-8700k Jumping cores and not turboing

[robbie09]

Ok so i got my brand new i7 - 8700k a week ago , super excited booted up everything cool. I ten realize its not turboing up to 4.7ghz on a single core, in fact, its not going above stock 3.7. I check turbo boost is on in both bios and intel advanced tuning utility. No worries i just overclock it to the respective turbo frequencies for all the different cores. The Max frequency it goes to is 4.3 GHZ (which is the max frequency when all cores active). I run a cinebench R15 multi core benchmark all good goes to 4.3 ghz.
But when i run a single core benchmark is goes to 4.3 again and doesnt go any higher. I check task manager and it appears all my cpu cores are in use , and as well as this the Benchmark seems to be jumping between cores. You can see the cores have short spikes of 100 percent utilization before it switches to another core.
So my question. Is it not going to 4.7 cos all the cores are active all the time and/or because the work load is jumping between cores to much? If not any ideas what is causing this. If so anyway i can fix this

 

[Kasper Jorgensen]

The core jumping is normal behavior. It is just Windows trying to balance the load.
Which motherboard are you using?

 

[robbie09]

The core jumping is normal behavior. It is just Windows trying to balance the load.
Which motherboard are you using?

ASUS Intel 1151 Socket Z370 Chipset Prime A D4 ATX Motherboard
https://www.amazon.co.uk/gp/product/B0764H6HC8/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1

 

[Kasper Jorgensen]

And what are your temps?

 

[robbie09]

https://imgur.com/a/ybGoSIY If you look here you can see my cpu is at 5 percent but all cores are active? is this whats stopping it turboing?

 

[robbie09]

And what are your temps?

All in green have run aida64 for 1 hour maxing out at 70. Intel extreme tuning utility says both power throttling and temp aren't happening

 

[Kasper Jorgensen]

No it's not, as I said, the core jumping is normal behavior on any multi core CPU.

Again, what is your CPU temps?

 

[robbie09]

No it's not, as I said, the core jumping is normal behavior on any multi core CPU.

Again, what is your CPU temps?

Its not just core jumping what its showing is that at low utilization all CPU cores are being used at the same time instead of 1 being used heavily which could be the reason for turbo boost not working as as far as its concerned all cpu cores being utilized. This also fits with the fact that when i clock it so with 6 cores (12 hyperthreaded) its 4,7 this works

CPU temps in green not thermal or power throttling happening

 

[Kasper Jorgensen]

No it's not, as I said, the core jumping is normal behavior on any multi core CPU.

Again, what is your CPU temps?

Its not just core jumping what its showing is that at low utilization all CPU cores are being used at the same time instead of 1 being used heavily which could be the reason for turbo boost not working as as far as its concerned all cpu cores being utilized. This also fits with the fact that when i clock it so with 6 cores (12 hyperthreaded) its 4,7 this works

CPU temps in green not thermal or power throttling happening

You are wrong. Because of core jumping, what you will see on for example a 4 core / 4 thread CPU is that when you load a single thread 100%, Windows Task Manager will show 25% load on all cores because of core jumping. So in your case if you load a single thread 100% the Task Manager should show around 8,33% load on all cores.
It is normal and has absolutely nothing to do with the CPU clock.

It's either because of CPU throttle if your temps are too high which is why I asked you about the temps, or it's a BIOS setting you got wrong. Also check the Windows power profile, which one are you using?

 

[robbie09]

No it's not, as I said, the core jumping is normal behavior on any multi core CPU.

Again, what is your CPU temps?

Its not just core jumping what its showing is that at low utilization all CPU cores are being used at the same time instead of 1 being used heavily which could be the reason for turbo boost not working as as far as its concerned all cpu cores being utilized. This also fits with the fact that when i clock it so with 6 cores (12 hyperthreaded) its 4,7 this works

CPU temps in green not thermal or power throttling happening

You are wrong. Because of core jumping, what you will see on for example a 4 core / 4 thread CPU is that when you load a single thread 100%, Windows Task Manager will show 25% load on all cores because of core jumping. So in your case if you load a single thread 100% the Task Manager should show around 8,33% load on all cores.
It is normal and has absolutely nothing to do with the CPU clock.

It's either because of CPU throttle if your temps are too high which is why I asked you about the temps, or it's a BIOS setting you got wrong. Also check the Windows power profile, which one are you using?

High performance power plan and bios settings are on default.
Thanks,

 

[Kasper Jorgensen]

So again, your CPU temps?

 

[robbie09]

So again, your CPU temps?

As i have said during a aida 64 stress test and a gpu stress test (make pc case temp hotter) the cpu stayed within its limits and did not throttle (spiked to 79 averaged 70)

 

[Roland Of Gilead]

I'd agree with kasper about core jumping and how windows reports it. Windows performance tab often reports various things incorrectly, but also doesn't show us exactly what we need.

With that said, lets try get a bit more info and see whats going on hardware wise. Install HWMon/Info. Open the program, and let your system idle for 20 minutes. Take a screenshot and post it. Then load up a game play for a min or two and then alt-tab out of the game, and take another screenshot of HWMon.

Then we can see CPU/GPU usage per core, temps, voltages, and currents, among a whole variety of other things. It will help us figure out if it's anything hardware related.

It could also be a software issue. So make sure windows is fully updated, and that you have all the system drivers, GPU up to date too. And finally make sure you are running the most recent bios.

Let us know.

edit: For stressing, and getting accurate repeatable results, I'd suggest using Prime95 Small FFT's. It will stress only the CPU/cache. It will allow you to establish the most important things i.e Max temp at a given voltage. When you run prime, use HWMon along side it to monitor temps on the fly!

 

[Roland Of Gilead]

So again, your CPU temps?

yeah, he told you above. 70 with 1hr of Aida.

 

[robbie09]

I'd agree with kasper about core jumping and how windows reports it. Windows performance tab often reports various things incorrectly, but also doesn't show us exactly what we need.

With that said, lets try get a bit more info and see whats going on hardware wise. Install HWMon/Info. Open the program, and let your system idle for 20 minutes. Take a screenshot and post it. Then load up a game play for a min or two and then alt-tab out of the game, and take another screenshot of HWMon.

Then we can see CPU/GPU usage per core, temps, voltages, and currents, among a whole variety of other things. It will help us figure out if it's anything hardware related.

It could also be a software issue. So make sure windows is fully updated, and that you have all the system drivers, GPU up to date too. And finally make sure you are running the most recent bios.

Let us know.

Doing now. Thanks!

 

[robbie09]

So again, your CPU temps?

yeah, he told you above. 70 with 1hr of Aida.

https://imgur.com/a/mc20lCr
https://imgur.com/a/5zLNT6D
idle

 

[Kasper Jorgensen]

So again, your CPU temps?

yeah, he told you above. 70 with 1hr of Aida.

https://imgur.com/a/mc20lCr
https://imgur.com/a/5zLNT6D
idle

So you are actually running at 4,5GHz on that current load.
Now download Prime95 version 26.6 and run a single thread small FFT stress test and let's see how your clockspeed is now.

 

[robbie09]

So again, your CPU temps?

yeah, he told you above. 70 with 1hr of Aida.

https://imgur.com/a/mc20lCr
https://imgur.com/a/5zLNT6D
idle

So you are actually running at 4,5GHz on that current load.
Now download Prime95 version 26.6 and run a single thread small FFT stress test and let's see how your clockspeed is now.

Am doing now. Task manager and intel extreme tuning utility both giving different (presumably incorrect readings) compared to HW monitor

 

[robbie09]

These are the in game hw monitor (was running bf4) https://imgur.com/a/wNMxGzC
https://imgur.com/a/TCp9eec

 

[Roland Of Gilead]

So again, your CPU temps?

yeah, he told you above. 70 with 1hr of Aida.

https://imgur.com/a/mc20lCr
https://imgur.com/a/5zLNT6D
idle[/

What game are you playing?

Is that an idle shot or gaming load? If you click the view tab, and reset values, then take a screenie again for idle.

The good thing out of that load shot is, you're CPU is all core loading to 4.5 which is 100mhz above what it should be!

Have you update all drivers and bios?

 

[Roland Of Gilead]

not sure what happened with that last post ^! ooops

 

[robbie09]

https://imgur.com/a/RRCfFUA
https://imgur.com/a/8Wjgff1
these are the prime 95 test run fft on 1 thread
Thanks for you time guys.

 

[robbie09]

So whats the next thing to do with trouble shooting?

 

[robbie09]

So again, your CPU temps?

yeah, he told you above. 70 with 1hr of Aida.

https://imgur.com/a/mc20lCr
https://imgur.com/a/5zLNT6D
idle[/

What game are you playing?

Is that an idle shot or gaming load? If you click the view tab, and reset values, then take a screenie again for idle.

The good thing out of that load shot is, you're CPU is all core loading to 4.5 which is 100mhz above what it should be!

Have you update all drivers and bios?

Sorry for slow reply didnt see it!
Everything is up to date bios, drivers,chipset
Idle https://imgur.com/a/oaiDXgL
https://imgur.com/a/Ni1xYXe

 

[robbie09]

Dont know what happened withthat answer aswell ^