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post #1 of 11 (permalink) Old 07-23-2019, 05:41 PM - Thread Starter
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Best way to Limit i9-9900K?

I have spent the last few days getting my new setup stable

Which at 4.7Ghz all core results in a max load of around 175w with Prime 95 Small FFT
which lets face it is a worse case scenario my cooler is capable of dissipating this so its fine

Now to get it stable at 5Ghz all core i had to bump the Dynamic Vcore(DVID) +0.025V

This results in a worst case load of over 220W with Prime 95 Small FFT at 5Ghz
My cooler is is only able to manage 180W of sustained load

the way i see it i have 2 ways to ensure it doesnt get out of control


Set either of the following

A) Set Package Power Limit1 - TDP (Watts) to 180W with it kicking in after 1 second unconstrained
or
B) Set TjMAX Temperature 92° and let my worst 2 cores bounce on the 92 limit results in a load of 181.8W

Does anyone know which is the best way from a performance perspective

oh and btw if i let it bounce off the 100° TjMAX results in a load of 200W

For real life workloads temps wont get anywhere near as bad as this but
i want to enforce some sort of limit anyway

My Bios Settings

Same for 4.7ghz but no offset and no TjMAX limit
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post #2 of 11 (permalink) Old 07-23-2019, 06:08 PM - Thread Starter
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Last edited by Shonk; 07-23-2019 at 06:28 PM.
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post #3 of 11 (permalink) Old 07-23-2019, 06:15 PM
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You want to know the best way to limit your OC because your cooler can't handle the OC?



dial back the OC?

Intel i9 9900K Coffee Lake @ X8 5309mhz (+47.5%)
AMD FX-8320 Vishera @ X4 5022mhz (+43.5%)
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post #4 of 11 (permalink) Old 07-23-2019, 06:19 PM - Thread Starter
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Its the best air cooler aparently
so there's not much i can do about that

and i have zero interest in an aio and from posts i have looked at
they are no better anyway
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post #5 of 11 (permalink) Old 07-23-2019, 06:30 PM
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Set power limits and durations. If you can set temp. limit then set that too.
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post #6 of 11 (permalink) Old 07-24-2019, 02:39 PM
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I prefer the power limit as the primary limit, I leave temperature limit at default 100C as backup in case something goes wrong. I don't hit either unless I'm benching or stress testing (which is not what I normally use my PC for ).

With offset/adaptive voltage the voltage also drops when downclocking at the power limit, which helps reduce power and allows a higher turbo at the power limit than would be possible with fixed voltage.

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post #7 of 11 (permalink) Old 07-24-2019, 02:41 PM
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And I also prefer to have AVX offset 0 and hit the power limit to trigger downclock. Non-zero AVX offset causes downclocking on very light AVX loads where it's not necessary.

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post #8 of 11 (permalink) Old 07-30-2019, 02:48 AM - Thread Starter
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Quote: Originally Posted by Luck100 View Post
And I also prefer to have AVX offset 0 and hit the power limit to trigger downclock. Non-zero AVX offset causes downclocking on very light AVX loads where it's not necessary.

Exactly where i was going im using a 200w limit atm on Performance AC/DC loadline
have to use 180w if using Power Saving AC/DC loadline


Im Using

CPU Internal AC/DC loadline
Performance 1.3 mOhms
Z390 spec is 1.6 mOhms (Turbo on My Gigabyte)

Power Saving i find is unable to pass a prime 95 load at stock speeds with stock DC loadline vdroop
it passes on low though

DC loadline
Standard/Normal/Auto = 1.6 mOhms (Intel Spec)

CPU Vcore = Normal
Dynamic Vcore(DVID) = -0.030

Cores 1-5 5.1ghz
Cores 6-8 5.0ghz

Its hungry chip though
For a 5 Ghz all core Prime 95 Large FFT VID: goes as high as 1.39v for 5ghz
and over 1.4v for 5.1ghz

Remember this is with intel spec droop though and 1.3 mOhms on the AC/DC loadline
as i feel im better off not using llc and sticking to intel spec
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post #9 of 11 (permalink) Old 07-30-2019, 02:52 AM - Thread Starter
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Quote: Originally Posted by Luck100 View Post
And I also prefer to have AVX offset 0 and hit the power limit to trigger downclock. Non-zero AVX offset causes downclocking on very light AVX loads where it's not necessary.
same i noticed this almost straight away
even a boot into windows with no background tasks causes avx offset to be triggered often

pointless even running 5ghz if its at 4.7 alot of the time on light loads from the offset
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post #10 of 11 (permalink) Old 07-30-2019, 03:53 AM
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Did you experiment with your fan setup? I'm wondering about what's happening with your two exhaust fans at the top of your case. When they are used as exhaust, I'm worried that they might steal fresh air from your CPU and GPU coolers. The air that gets into the case will want to take the path through your case where it hits the least resistance. I'm wondering if the fresh air might then decide to immediately leave the case through the top exhaust without going through your coolers.

That said, you really have to experiment with this. Using exhaust fans at the top is perhaps still be the best performance when the GPU is under load and heating everything up.

On my PC here, what I found out is that removing all fans from the top and closing the venting there up with tape is the best, but my case here is a traditional ATX mid-tower case, not a cube like yours.
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