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What does 13900k instability look like

smegle

smegle

smegle

Associate
Joined
31 Dec 2006
Posts
188
Hi all,
I’m currently tuning my 13900k on a rog strix z790e mobo.

I’m using the guide attached below:
www.overclock.net

Asus Maximus Z790 and Intel i9-13900k/14900k - An...

www.overclock.net www.overclock.net

I initially got my ac_ll down to 0.17 however when it came to test with geekbench it just wouldn’t finish the test. R23 and Firestrike were fine.

I’ve settled on 0.24 now and will pass geekbench and have just increased OCTVB to +1Boost.

It’s not crashing, bsod’ing etc but my cores do move around a great deal on the clocks. Temps are 90ish degrees max after r23 completes. I’ve not had any crashes in games at all. 3D mark firestrike seems to vary between 49950 and 54000!?

Is this completely normal with these new gen chips? - after coming from an overclocked 9900k at 5ghz locked it’s just something I ain’t used too and wondered if it was lowering clock speeds due to instability?

Ta in advance!
 
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Nickolp1974 said:
all depends how you have it set up, what are your P/e/c cores set too? are you using adaptive voltage? Running Geekbench checks the transient response of the PC, the change in clock frequency. Sometimes this can be remedied through setting an offset to the particular frequency in the V/F curve.
1st thing i always do is set to all core say X55, Set your mem to XMP or whatever, LLC4, X44 E cores 48/50 Cache and now find the lowest voltage stable for all your tests and write it down( you want the load voltage while the test is running)
Now keep all cores at X55 and switch to by core usage, D/C 1.02, A/C 0.20, LLC4, change to adaptive voltage, adjust A/C as before to get same stable voltage under load.
Then you can adjust core table something like 55,55,56,56,57,57,57,58, then run tests, if geekbench crashes and or 3dmark a positive offset to V/F points 8,9,10 may be required, try 0.040 and test, increasing by 10mv at a time till it passes.
If you find the frequency is downclocking at full load and you have cooling headroom you can introduce a temp offset in the TVB menu section, if you do this and a bench fails increase A/C till it passes as your allowing a higher temp threshold allowing the frequency to sustain higher and longer thus requiring more voltage. All about balance
Click to expand...
Thanks for this. If I run r23 they are definitely down clocking the p cores to 5300/5400 at full load so I’m guessing something isn’t stable when I start out. I’ll try your method you mention above.
When you are reducing the initial voltage what setting do you lower? Is it the ac 0.2 as in the guide?
 
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Nickolp1974 said:
Check temps while running R23 and LOAD voltage

yes lower A/C 0.02 at a time till it crashes then bump it back up 0.02 and you should be good to go. LLC4 must be set and adaptive voltage, the one below Global core voltage

what cooler are you using?
Click to expand...
Is a h115i capillex 280mm
 
OC2000 said:
A Lower AL_LL shouldn't affect geek bench, only all core stress like CB23. So get the AC_LL as low as you can 10 min CB23 stable then set an adaptive Global SVID to 1.48 and and work your way down until geek bench is unstable. If you are using an OCTV boost +1 or +2 profile or single boost higher than 58, you may need to alter the V/F curve 10 +0.040or higher as Nickolp says, which will then increase your target die sense for CB23, so work you AC_LL down more. If you hit 0.01 and your target die sense voltage for CB23 is still too high, use the octool which is linked on that guide to generate a multi point V/F curve adjustment which will lower the target die sense voltage further while providing high enough voltage for low load to keep geekbench 5 stable.

I ended up with the following:

LLC4 - 1.04/ 0.01 (1.04 because the VIDs then matched the Vcore. At 1.02 there was a 0.01 variance between the two)
Adaptive voltage 1.45
Cores (62,62,61,61,59,59,58,58) with OCTV boost +2
E Cores - 47x4, 46x8,45x16
This provided enough Low load Voltage to pass Geek bench, however running CB23 I got a die sense voltage of 1.24V I know 5.6 all core will do it at 1.22V so created a V/F curve profile using the OCTool to maintain the higher V for low loads and reduce the target die sense to 1.22V
V/F 8 +0.079
V/F 9 +0.049
V/F 10 +0.049
Click to expand...
Cheers.
So just for my understanding, when under 100 percent load in cb23 for example, I should not see the core frequencies not under clock themselves?
So in your case above, under full load you never see a peformance core go under 5800mhz?
 
Nickolp1974 said:
1st thing i always do is set to all core say X55, Set your mem to XMP or whatever, LLC4, X44 E cores 48/50 Cache and now find the lowest voltage stable for all your tests and write it down( you want the load voltage while the test is running)
Click to expand...
Sorry for another question, so it’s the ac 0.2 you reduce for this first stage or another setting?
 
Think I found the issue. If I disable all limits, the p cores are rock solid at 5.5.
However my temps are huge and up to 100 degrees.
Could it just be I have a bad chip and my h115i 280mm just ain’t cutting the cooling?
This is with all stock, other than llc4 acll at 0.24 (it’s unstable below this) and dc at 1.02
 
so with enforce all limits on, at stock on r23 it’s throttle the core down to 5100.
With the tuning guide, I cannot get it down to a stable level by just reducing acll as it either runs up to 100 degrees or crashes. Is there any other methods I could use or have I just been unlucky in the silicone lottery?
 
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Hi - will post a screenshot of that tomorrow - nearly bedtime for me

Tonight I’ve fitted a thermal take cpu support. Temps have now dropped 8 degrees c on full load and I can run without mobo limits on r23, stable with acll at 0.24. Max p core temp is 96 deg and no throttling at all of the cores - all p core at 5.5 solid and e cores at 4.3 solid.
My score has also gone from 38760 to 39953!

Not bad for a 12 quid bracket. Will now follow the guide and see if I can get that acll down lower then follow it through
 
Harshell123 said:
Can you not lower your AC-LL at all? Your temps are higher than what I’d expect. Is your aio set to run at 100% in these stress tests, as well as your fans being set properly etc? Are your idle temps good? What’s your SP number?

Could just be extremely unlucky I guess, but I doubt it. Somethings not right.

You are going to have to upload screenshots of HWINFO etc to be able to see what’s going on.
Click to expand...
Thanks - which screen specifically do you need to see in hwinfo?
 
Harshell123 said:
I wouldn’t be happy with the voltages being that high even when not under load. Your temps aren’t even that bad. What are they like in gaming? You should be able to get your full load voltages lower than that at 5.5 also.

If it were me I’d forget about 6ghz, set everything at stock and run stock 5.5 P Core, 4.3 E Core, and work your AC/LL down as much as you can until unstable then increase 2, enable C States, LLC level 4.

Then take it from there if there is any wiggle room.
Click to expand...
I’ll load up tomorrow am in dcs and post the load numbers after
 
Harshell123 said:
I wouldn’t be happy with the voltages being that high even when not under load. Your temps aren’t even that bad. What are they like in gaming? You should be able to get your full load voltages lower than that at 5.5 also.

If it were me I’d forget about 6ghz, set everything at stock and run stock 5.5 P Core, 4.3 E Core, and work your AC/LL down as much as you can until unstable then increase 2, enable C States, LLC level 4.

Then take it from there if there is any wiggle room.
Click to expand...
What does your 13900k run at?
It seems to overvolt when not under load. But when under load it anchors itself down?
 
Harshell123 said:
Mine can get in the 80’s while stress testing.

If you have set your LLC at level 4, that’s exactly what should happen. Under load your VCore will drop, whilst low load/idle it will go up.

It would be good to see your actual V Core also.
Click to expand...
Please delete this - see below
 
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