14900K undervolt

[TurboTrym]

Hey i recently got a 14900KF, i looked up a guide about undervolting without losing performance, i see that his bios is a bit different than mine, he has CPU CORE-CACHE VOLTAGE. While i have ACTUALY VRM CORE VOLTAGE and GLOBAL CORE SVID VOLTAGE

which one of these am i supose to pick adapative into offsett of -0.050?

 

thanks for answers

[ChrisLoudon]

26 minutes ago, TurboTrym said:

thanks for answers

Hi buddy,

 

What mobo do you have? Just makes it easier for us to know what the menu options are.

 

When I undervolted my 13600k on an MSI board it was as easy as lock the cores, set the P and E multipliers, select the 'CPU Core Voltage Mode' to 'Manual', and work backwards until I started to get some instability and then knock it up a notch or 2 and be done with it.

 

I think there was also a setting called Lite Load Control that I tinkered with but tbh I don't know what that did (if anything). You should also tinker with LLC (Load Line).

 

You'll get differing opinions on what Voltage Mode you should use (adaptive , offset , manual....). I kinda liked manual cos I would set it and know that out with external factors, that's what the vCore would be.

 

I wouldn't mess with VRM or Cache voltages at this stage. 

[TurboTrym]

I have Asus Z790 Apex

I dont know a whole lot about OC.

but i know for a fact that the 14900k gets more voltage than it needs for «stability» reasons, but should be able to do an adaptive into offset 0.05 with no problem, is just that his menu is a bit different than mine so i dont know which one is which

[ChrisLoudon]

Based on what I can see from the pics attached I would leave Global Core SVID Voltage to Auto, change CPU Core / Cache Voltage to Manual and start from there.

 

Are you locking your P and E cores? What's your target?

 

 

[TurboTrym]

I just want them to be as they are tbh and only play with the undervolting as i want lower temperatures

[ChrisLoudon]

Just now, TurboTrym said:

I have Asus Z790 Apex

I dont know a whole lot about OC.

but i know for a fact that the 14900k gets more voltage than it needs for «stability» reasons, but should be able to do an adaptive into offset 0.05 with no problem, is just that his menu is a bit different than mine so i dont know which one is which

Coolio.

 

Historically, you 'all-core' OC was usually in the region of whatever the max-turbo frequency was on a single core but that's becoming nigh on impossible to since 12th gen.

 

Without knowing how a 14900k performs, I would suggest locking your P-cores to x55 and your E-Cores to x45. My 13600k is x54 and x44 so I'd assume the 14900k can be pushed a little further.

 

Set the Vcore (manual mode) to 1.3v (which maybe still a little hight) and see if (a) your system boots ok, (b) it runs a few passes of Cinebench R23 and (c) doesn't cook itself.

 

I should have also mentioned, in BIOS remove any 'AVX offset' or set to zero. Some BIOS's have a negative 2 or 3 offset in by default.

 

 

[ChrisLoudon]

1 minute ago, TurboTrym said:

I just want them to be as they are tbh and only play with the undervolting as i want lower temperatures

Ahh, well you shouldn't have any issues dialling back the vCore then' The out of the box settings for 13th and 14th gen Intel's are outrageous. I thought I'd done something wrong the first time a booted my new 13600k build as the temps were so high even with custom loop water cooling.

 

Just make sure you run a few loops of Cinebench R23 (multi-core) after every change just to monitor temps and stability.

 

You can probably start with -0.1v increments and then move to +0.05 as soon as you starts to see some crashing.

[TurboTrym]

Yes but which one am i supose to do - 0.1 on? theres too much to choose from

[TurboTrym]

Actual VRM core is that the correct one?

[ChrisLoudon]

17 minutes ago, TurboTrym said:

Yes but which one am i supose to do - 0.1 on? theres too much to choose from

Have a look at this vid. I think he's showing your board.

 

 

It looks like you want to set 'Actual VRM Core Voltage to Manual' and start from there. He has it at 1.24v

 

[maxrockbin]

My Asus board is much older and so is my CPU, but the "Tweakers Paradise" settings look very similar.  I recently undervolted my CPU and the CORRECT ANSWER is to use OFFSET MODE.  Videos about this can be very confusing because they're using different settings to make their benchmarks consistent.

 

You also want to be sure you set the "offset sign" to "-" (minus, not +) if you're undervolting.

Then I set the offset to 0.10.  You should definitely run something like HWINFO64 before and after any changes.

Also remember to save any changes to a file and before you exit, the Asus bios should show you all changes you made.  Take a pic of that!

I'm sorry I didn't make better records of my changes.   

 

If you use manual mode your voltage is locked and your CPU will not be able to ramp down when idle. (One of the settings used for benchmarks to get consistent results).  Also, turn off "multicore enhancement" since that will mess with your voltages a lot (lots of videos raging against Asus for ON as default).     Also, someone suggested setting fixed Pcore and Ecore frequencies.  Unless you want your machine going full throttle when you're reading email, I wouldn't recommend that.

 

When I was figuring this out, I actually found ChatGPT very helpful in explaining the settings and helping me to figure out what was going wrong (like using manual and ending up with the voltage not dropping for low workloads).   If you need any screenshots of my bios settings, let me know.   This video was nice for showing some of the good results you can get on a 14900k w. undervolting (UV).  But NOT for adjusting the settings.  He says at the end that he really has to make a settings vid...

 

 I live in Portland, OR.  They really should license the "Tweakers Paradise" from Asus for Downtown.