Undervolting i9

[Psycrow]

I have a i9 11900k cpu and a asus maximus extreme XIII board.
Currently my pc runs fine and has no problems.

But i have seen some videos where they undervolt this cpu to reduce heat and now im hooked on that.

My bios knowledge on OC and undervolting is rusty but after a quick reseach then it says i need to change the cpu to a offset value and choose - negative value
So i tryed to set the value for 0.0100 and it dosent change anything in the stress test. I still gets the same temps.

Using cpu z then i see the volt goes to max 1.280 v ish under load.

Currently im using windows balanced power, so the cpu idles when im afk.
The mhz does jump from 800 mhz to 5100 mhz using 1.488 ish volt when it peaks 5100 mhz

So am i doing something wrong here since nothing changes ?
Or can someone enlight me how to lower the volt and get better temps ?

Using air coolers prolly wont give me alot but anything helps in this horrible summer heat !

 

[Psycrow]

Sneeze !!

 

[chameleoneel]

I have a i9 11900k cpu and a asus maximus extreme XIII board.
Currently my pc runs fine and has no problems.

But i have seen some videos where they undervolt this cpu to reduce heat and now im hooked on that.

My bios knowledge on OC and undervolting is rusty but after a quick reseach then it says i need to change the cpu to a offset value and choose - negative value
So i tryed to set the value for 0.0100 and it dosent change anything in the stress test. I still gets the same temps.

Using cpu z then i see the volt goes to max 1.280 v ish under load.

Currently im using windows balanced power, so the cpu idles when im afk.
The mhz does jump from 800 mhz to 5100 mhz using 1.488 ish volt when it peaks 5100 mhz

So am i doing something wrong here since nothing changes ?
Or can someone enlight me how to lower the volt and get better temps ?

Using air coolers prolly wont give me alot but anything helps in this horrible summer heat !

Make sure you turn off any of Asus performance enhancing settings. Stuff like MCE (multi-core enhancement) and other features, can ignore custom settings. I would also check to see if the over voltage protection is enabled (sometimes they disabled it by default).
Also, turn off Thermal Velocity Boost. That's an Intel feature. But, it can mess with custom tweaking. And very recently, it was found to have a bug in it for 13th and 14th gen. It may also have a bug in 11th gen.


**also make sure your VRM load line setting is at a moderate level. If its high by default, it can provide more voltage than intended, along the entire performance curve.

 

[kalston]

An easy way to reduce heat in summer would be to set a power limit, for example 125w for PL1+PL2, this will automatically keep clocks and volts in check too. There is a cost for multi-threaded performance, but for mundane tasks and gaming you won't really notice. You can also reduce the temperature target (I think Asus defaults at like 90?) and let the CPU get that hot (say 70c), and it will reduce clocks and voltage automatically - outputting less heat in summer, and more in winter, automatically
My favourite aspect about those methods: they do not affect stability. It's 100% fool proof. You only lose some performance.

The default settings on this board likely boost the clock on all cores and unlock the power limits, but there should be an option to apply Intel settings, which will already greatly reduce the heat.

Undervolting can let you squeeze more watts off without affecting performance much if at all, but it comes with risks (instability when too low).

And TVB has no issues on 11th. In fact 11th was practically bug free, and most boards for it are decent (Asus z590 boards are even great). But certainly you can disable it to make the CPU more efficient, at a small cost in performance.

(My home server is using my old 11900k (bought on release) on an Asus z590 board, and I've managed to make it really efficient, on idle the whole machine draws 25w from the wall)

 

[Psycrow]

I disabled the multi-core enhancement. That helped with the temps not reaching 95 c
But it also changed the mhz clocks to a lower rate than current set as OC

I have never tryed to change the w rates for anything so im a bit scared and to green for doing that.

Here is what i dont understand.

I have clocked my cpu to run 5300 mhz but i only see my cpu go to 5100 mhz when it loads something in windows.
Currently im using balanced power settings where the cpu idles between 800 mhz and 5100 mhz. So it ramps up and down between these mhz.
I guess the lest 200 mhz from 5100 to 5300 is turbo related.

Using cinebench for testing makes my cpu run 4100 - 4200 mhz stable, but when i stop cinebench from running, then it goes back to the balance state 800 - 5200 mhz
Testing in cinebench gives me 62-70 c using 1.112 v to 1.168 v

When i power up the pc on cold then it starts on 38-40 c and ramps up to 45 - 48 depending if windows loads something in the background. Now im using wallpaper engine and rgb light service from asus crate.
These 2 programs makes my cpu peak up aka why it ramos up to 5100 mhz sometimes. But it never overheats.

So i figure i need to adjust something else in bios ? and im to scared to mess with the watt.

i did try to choose adaptive - offset and used -50 to -75 value but it dident make the temps drop
If i enable multi-core enhancement then the cpu get slike 90-95 c but the mhz increases to 5100 - 4800 ish

So what am i doing wrong here. I just want the cpu to drop 5-10 c and still load at least 5000 - 5100 mhz

 

[Carlyle2020]

Setting ac_ll to 0.01 and tuning this way is the least amount of heat possible for any given frequency.
This gets rid of one of two failsafes concerning voltage stability but it´s worth the reduction in additional heat.
Bad idea on cheap boards.
Good idea with air coolers.

 

[Psycrow]

Edit:
The ofset - power was set to auto, so now its set to ofset - 0.075 and i can see my mhz increased to 4300 and temps 60-65 using cinebench.
But why dosent it ramps up to 5100 or 5300 mhz using stress test ?
Why does it stay on 4100-4300 mhz ?
I dont understand it

 

[chameleoneel]

Edit:
The ofset - power was set to auto, so now its set to ofset - 0.075 and i can see my mhz increased to 4300 and temps 60-65 using cinebench.
But why dosent it ramps up to 5100 or 5300 mhz using stress test ?
Why does it stay on 4100-4300 mhz ?
I dont understand it

5300 MHZ is the speed for 2 threads. As you use more threads/cores, the speed drops.

Here is a graph from Techpowerup's review:

https://www.techpowerup.com/review/intel-core-i9-11900k/23.html


Note that the speeds are different, for different code types/instruction sets. AVX is the lowest, and that's what Cinibench uses.

If you want to test other instruction sets, OCCT is a great testing tool. It will also tell you if your cores are unstable, so you don't have to guess or wait for a crash or a freeze.

If you want all cores to be 5.3, you have to manually overclock. And it will be HOT.


Something I like to do with Intel CPUs, is to simply turn the LLC down to lower settings. That effectively undervolts the CPU Along the entire voltage curve. But, I find it to be more stable than directly undervolting.

Then for fun, you could try turning on Intel's ABT setting (Adaptive Boost Technology) at the same time as a low LLC.
ABT is similar to Asus Multi-Core Enchancement. But, its smarter, as it actually uses all of the board's sensors to dynamically OC the CPU.

 

[Psycrow]

Ok that makes sence
What do you mean with lower LLC Load line calibration but what is a low setting ?