I7-8700k Jumping cores and not turboing

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robbie09

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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
cIQSNvO
 
Solution
gingerrankin
If you do not OC, the one-core speed 4.7 GHz is simply Intel's marketing. It can only be obtained as a laboratory curiosity. In real life, he will never observe it (unless he performs OC or activates the MCE, which is an undercover OC modality).

The reason is that you will always have programs in the background (antivirus, onedrive or similar, ...) and windows will always determine that it is better to activate more than one core.
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robbie09

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Kasper is correct at all cores it boosts to the correct speed the problem is it doesn't boost to anywhere near 4.7 with a single core test but i can do all 12 if you think that will help?
 
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Roland Of Gilead

Roland Of Gilead

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I hear ya! That was a good thing to test. The reason why i said run 12 is because his temps are a little on the high side. Running all 12 will give max CPU temps and can help determine if there's any throttling, and/or that the CPU temps at max load are preventing it from boosting.
 
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Roland Of Gilead

Roland Of Gilead

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yes, see my last point to kasper :)

edit: what cooler are you using? It could be important.

 
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Kasper Jorgensen

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Yeah, like keith12 suggest, try a CMOS reset.
Also if that doesn't help, go to BIOS and try to find something called MCE (Multi Core Enhancement) and enable it. This would enable the cpu to run max turbo boost on all cores as in run 4,7 GHz when all cores are used.
 
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robbie09

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I run a hyper 212 evo with 2 fans. It is adequate as because my pc is in the next room i can run fans at max
About to do bios stuff think i already tried multi core enhancement but will check.
Ive left my pc ideling for long time and max core clock on HWmonitor is 4516
 
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Roland Of Gilead

Roland Of Gilead

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so did you reset the CMOS? Did it have any affect?

Yes, it might be an idea for the BIOS images. Only really need the advanced pages (voltages, CPU, SOC etc)
 
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robbie09

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CMOS reset made no diffrence i have just OC all cores to 4.7 it works but runs hot. Getting new cooler (NH-D15) so once that comes will just leave OC. Havent fixed the Turbo issue per say but worked around it lol
 
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gingerrankin

gingerrankin

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If you do not OC, the one-core speed 4.7 GHz is simply Intel's marketing. It can only be obtained as a laboratory curiosity. In real life, he will never observe it (unless he performs OC or activates the MCE, which is an undercover OC modality).

The reason is that you will always have programs in the background (antivirus, onedrive or similar, ...) and windows will always determine that it is better to activate more than one core.
 
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Solution
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karenjoly

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Apr 13, 2018
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Lemme see. You o/c the cores ( sync all cores) to 4.3GHz and now wonder why that's all they do ? The interesting data you ran by is the first fact you report, to wit,
" I then realize its not turboing up to 4.7ghz on a single core, in fact, its not going above stock 3.7 ." Figure this out and the other items may make sense.

Release the o/c.What are the idle frequencies ? 3.7 ? And what are freq. when playing a game or whatever , when the cpu usage is ~ 80 % ?
 
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dudeman509

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Jan 23, 2015
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I see one-core speed hit max turbo speed all the time in HWMonitor. I see it with my 3770k, my 3630QM, and with the E5-2640v4's we've got in rack servers.

It may not sustain that max speed once other threads/processes spool up, but you should still capture it at some point in the 'max' column.
 
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