Hey yhanks for the fast replies, I tested whole night yesterday. So I can confirm that with r20 my system does not bsod but with r15 it does I am confused I gad to bump my vcore from 1.30v stable on r20 to 1.34 to be able to run r15 without bsod. So I had The cpu power managment on max avx on 3 llc on 5 and vcore on 1.30v cpu @ 5.1 ghz stable on R 20 Gta v warzone. But BSOD on OCCT with AVX off and r15. I had to bump to 1.34v and llc 6 to get it stable on R15 and OCCT.
So if I get ot right staying under 85 at stress test and under 70 for gaming. And max 1.35v and max llc6 to stay safe.
How is it possible that ai optimizer sets it to 5.0ghz 1.30v while at 5.1 1.34v for me its not even sute its stable. Is AI optomisation so bad in 2020 compared to manual for an youtube ocer xD? Last question arent these 20 bsod not bad for my system?
Watch der8auer's 9900K on Asus overclocking guide, it's quite useful.
I run my 9900K with
- Load Line Calibration of 6 or 7 in the BIOS (my Hero set itself to 6 based on auto calibration after the initial overclock, and I've left it as Auto)
- all CPU core ratios to 49
- manual CPU core voltage of 1.28 V
- AVX offset of 3 (4.9 -> 4.6 GHz during AVX workloads)
- RAM (2x 16 GB Vengeance 3000 Mhz) at XMP defaults with a slight voltage bump to 1.35 V.
With a Corsair H100i I get idle and general usage temps between 39 and 45 celcius; gaming or rendering takes them to mid 60 or low 70s.
This is slightly conservative relative to what this CPU could achieve. I prefer to prolong CPU life instead of burn it out or lose the OC down the line!
Synthetic tests like OCCT or Cinebench R20 give me temps around 75-82 all cores and package; Folding@Home will take it up to 85-88 package but I throttle that back to 6 cores. Cinebench R15 runs about the same temps as R20. At my level of OC, I have no instability from any AVX offset and I prefer a small downclock for heat management.
Load Line Calibration is an important concept to understand - configuring it properly helps compensate for Vdroop during higher overclock workloads. Improperly calculating it can prematurely degrade / damage your CPU.
Also watch this GamersNexus explainer: https://www.youtube.com/watch?v=NMIh8dTdJwI
MSI published a decent blog post about it: https://www.msi.com/blog/LLC_what_is_it_and_why_are_MSI_Z370_motherboards_the_best_choice_for_overcl...
A guy from ASUS ROG also filmed a GN primer about transients, VRM and LLC: https://www.youtube.com/watch?v=tqvj4CQhRmg
From what I've been advised by people overclocking these chips all the time, anything up to 1.45 V is safe for the CPU - it'll thermal throttle before it damages itself permanently. However you'll have a massive cooling issue to deal with first. Do not push the LLC to more extreme levels once you start to get to the 1.4 V CPU core voltage level as you will have load voltages towards 1.5 V which is dangerous for the CPU and stresses the VRM.
Take a note of your per-core temperatures while rendering, if you're unlucky (or your thermal paste is badly applied) you may have some cores which are heating faster than others. If so, consider setting per-core overclock ratios and adjusting the CPU voltage down a little.
I would do something like run an OCCT stress test for 1 or 2 hours; if it passes that without BSOD or thermal throttling, your machine is probably stable enough for normal use. Don't rely solely on synthetic benchmarks. Running small FFT Prime95 BSODed my PC almost immediately (before I adjusted my previous OC a little) but I don't care specifically about Prime95 outcomes because it's not representative of real world use. Unless your sole intention is to run Prime95 🙂
The 990K is a HOT chip, and unless you're going to delid and spend $$$ on liquid metal cooling with IHS removal to do direct-die cooling, managing temps is going to be a pain. Your mileage may vary...
Personally I wouldn't bother going beyond 5 GHz unless you have a decent watercooling setup.