Originally Posted by MikeJeffries
I am new to overclocking in general, but I have done alot of reading on the subject and I'm working on overclocking my 2nd Gaming PC.
I have a 9900KS on an Asus Rog Maximus XI Extreme eATX board.
H115i 280mm AIO on it as well, and all the fans I could fit.
I followed Der8auer's youtube video on overclocking the 9900K, and he mentioned to adjust LLC from 6 up to 7 if need be, or increase the voltage higher if you see Vdroop kicking in when testing Cinebench R15 or Prime95.
I've tried LLC 6 at 1.30-1.33 and then i move to LLC 7 from 1.30 up to 1.35, and it's always dropping the voltage during stress testing.
It seems to stay stable through the tests, but it is having Vdroop Kicking in.
Will I have any issues later that I should try and fix now?
If it goes through Prime95 v26.6 for about 30 minutes at 1.30V and LLC7, but has Vdroop kicking in during the test, should I leave it as is? Or can I drop it further to LLC 6 and run again to try and pass it through for another 30 minutes?
If the voltage drop isn't going to cause crashes in my games, then I can push the voltage/LLC/AVX offset a little more, correct?
There will ALWAYS be vdroop at every LLC except 8. And don't use such high LLC anyway. Vdroop is your friend, contrary to what you may think.
Here is what happens if you jack up the LLC too much.
Most people don't understand that it isn't the sensor reading or the "RMS" voltage that determines stability in the end. It's the -transient minimum- that does.
The Maximus XI Gene/Xtreme boards work best with LLC5. LLC5 is the best combination of medium vdroop and good transient response. LLC6 isn't worth it because transient 'dips' increase too much below the vcore sensor reading. You will need a higher BIOS voltage for the extra vdroop but this is NOT a problem. 1.40v BIOS set + LLC5 is perfectly safe to use for day to day usage (don't try to run small FFT AVX Prime95 or LinX 0.9.6 at this setting though. Stick to Realbench 2.56 or Cinebench R20 with 7200 custom second loops if you want to stress test that).
In the 16k prime95 AVX test by buildzoid, you can see that "average to minimum" voltage distance is closer at LLC5 than LLC6. That's why LLC5 works so well. (Use his Asus Gene results).
Also some games hate too high LLC+Decreasing BIOS voltage to reduce idle voltage too much.
Apex Legends is known to crash if you use a too low BIOS set voltage+too strong LLC.
For example, in Prime95 29.8 build 6, small FFT with AVX disabled, the following two settings give the exact same max load vcore after vdroop, and same temps/current: (on my Gigabyte Master): at 5 ghz
1.250v + Vcore LLC "Turbo" (LLC6)
1.30v + Vcore LLC "High" (LLC5)
Both give 1.195v full load in Prime95 and is stable.
However Apex Legends will crash randomly at 1.250v +LLC6. (Requires 1.260v bios set to not crash).
But will run just fine with 1.30v +LLC5!
Because the "low load" voltage is higher at 1.30v LLC5, compared to 1.250v LLC6.
So it's often not a good idea to raise LLC too high and reduce BIOS voltage too low just because a stress test passes at the same load voltage.
Use HWinfo64 to look for WHEA CPU L0 errors in the sensor bottom section.
Another LLC video on torpedoing your voltage regulation