Something is causing my system to become unstable. I am also getting freezes and instability in the bios and in Windows causing problems bench marking and general usability. I think the internal clocks are changing as the system starts to corrupt or vice versa. After a reflash and fresh install things are mostly OK except memory stability. Once I overclock, things start to change. The bios starts to freeze a little and no lower memory clocks are accepted other than what I have set which is XMP +400MHz 17-17-17-37-360 from 700. Little by little running benches amd restarting it slowly starts to act up. USB drivers start to crash, USB connect/disconnect sounds during 3DMark, slightly slower start ups, unstable bios screen, and just a general quirky system.
 
Increased issues with restarts, PX1, Classified Tool, and 3DMark. When I start crashing and restarting the NVidia drivers, the system starts to progress . The system starts showing signs that the internal clocks are changing when using Port Royale and 3DMark. I believe Port Royale and TSPY read something wrong with my system and clocks and either do not allow me to run, load, crash immediately, or give me scores that are much lower and inconsistent than what this system generally scores when stable. At some point the system gets to a point where not even default Bios, CT and PX1 setting  will allow for a full run in 3DMark. CPU clocks then start to fluctuate set to override 25% . Then the Vcore gets stuck at unknown voltage and temps rise. System will then crash even with default setting in bios. Reflash bios and re-install Win all back to OK minus memory issues.
 
The only change Ive made is swap out the 86K to the 99KF. Everything was great and running smooth as silk since the 1.05 bios with that processor. I have swapped memory, KPE cards, CPU coolers, and power supplies with same results. Switched 1809 to 1709 w and w/out updates and back.  Nvidia 125.31 to 130.xx and back with DDU.  
 
PX1, Classified Tool, HWInfo, HWMonitor, Performance Test , SuperPi, MeMTest, Cinabench,  on Win 1809 Updated, Latest Chipset, I/O, NVidia 125.31
 
 
Z390 Dark
9900KF   5.2-5.4
G.Skill Royal 4000-17-17-17-37  XMP 4400   360
2080 KPE
Alphacool Eisbarer Extreme
1600axi
 

        What kind of item?
 

wwxww
        What kind of item?

I file a folder a shortcut it makes no difference.
All my 1809 rigs do this even a Fresh Installed one and two upgraded ones.
(I do a copy to crash before I use the computers now)
Not seeing this on any older versions of Windows 10.
I just did a Feature update of my last 2 1709 to 1803 and not seeing any issue at all.
 
Under 1809 Driver 430.64 is now causing NVIDIA Graphics Security Errors running Time Spy (Current Version)

wwxww
Not seeing any Explorer errors...I do see many warnings and errors though...I'm going to look and see what errors happened yesterday with 140.34

Just the desktop flashes.
Do you mean 340.34
 
Also I am going back to PX1 0.3.16.0 because of computer lock ups with 0.3.17.0

 

bcavnaugh

wwxww
Not seeing any Explorer errors...I do see many warnings and errors though...I'm going to look and see what errors happened yesterday with 140.34

Just the desktop flashes.
Do you mean 340.34
 
Also I am going back to PX1 0.3.16.0 because of computer lock ups with 0.3.17.0

Yes, sorry, so many driver numbers lately
 
I am on 0.3.17.0 because I thought it may help. 3DMark and PX1 and NVidia hard crashes are aplenty.
 

wwxww, Is 5.3/5.4 stable at XMP?
 
Using 99kf, dark, trident 3200c14 32GB.  Not too impressed with 9th gen series.  Everything is stable at stock, but can only hit 5.2 stable.  5.3 BSOD on TS, but runs prime, aida, powermax, although AVX is set to 3.  Will try reverting to 0.3.16.0.  I close everything except CT and disable NIC.  General gaming is better, but benching this 9th gen cpu combo is new to me.  Been 5 days on this board so still learning.  So far, 5960 benches better than 9900KF.  Makes me regret not going 9900x for better overall daily.
 
Has anyone have good experiences OC'ing FSB on dark or a z390?  Running case closed and conservative fan curves.  Looking at custom dual rad loops, but unsure about HC.  Not sure if this will help my 99kf in the short term.

808sting
wwxww, Is 5.3/5.4 stable at XMP?
 
Using 99kf, dark, trident 3200c14 32GB.  Not too impressed with 9th gen series.  Everything is stable at stock, but can only hit 5.2 stable.  5.3 BSOD on TS, but runs prime, aida, powermax, although AVX is set to 3.  Will try reverting to 0.3.16.0.  I close everything except CT and disable NIC.  General gaming is better, but benching this 9th gen cpu combo is new to me.  Been 5 days on this board so still learning.  So far, 5960 benches better than 9900KF.  Makes me regret not going 9900x for better overall daily.
 
Has anyone have good experiences OC'ing FSB on dark or a z390?  Running case closed and conservative fan curves.  Looking at custom dual rad loops, but unsure about HC.  Not sure if this will help my 99kf in the short term.

Some have tried but It is not like other motherboards IDT. I tried and ended up crashing a lot and not getting anywhere. It changes a couple other values adjusting FSB.
 
 I am stable at 5.3 1.36v 0 AVX 4400-17. At 5.4 I am mostly stable. I couldn't pass Prime for sure at the voltage I have to run at to keep temps down. 0 AVX offset. I can run it at 5.5 but with failure on Cinebench and high temps. Not really impressed with my Physics scores but Single Thread is crazy good. Others running the 99K at 5.4 kill this one.

Clear improvements after installing latest Chipset driver.
This system is starting to act up, again.  Desktop items have disappeared. I am unable to load some programs. Items have disappeared and if I try to open open after reinstall, I get an error telling me unable to open, try reinstalling. Cpu-z, Cinebench, SuperPi, Classified Tool, and Aida also disappeared from the desktop. Unable to open pictures. I get an error asking to reinstall. Memory tests slowed by 2-3 ms. Even loading a saved profile in the bios gives me lower scores. 
 
Do I do another reflash-reinstall? Is my over clock adding to this?
 
Board was at default setting when some of these things started to happen. I can only run it like that for so long before back to benching.
 
 

Hey bud...This board is wacky for sure...memory is not predictable at all. Nothing makes any sense when it comes to over clocking memory. Yes, everything is fine at default with XMP after I have re-flashed and reinstalled OS. But I would only use it for stuff like interneting like that. If I'm manually setting up memory, I can get no where in an hour. The only way for me to over clock memory and lower more than just clock to 4200 and lower Trfc to 360, is to set to xmp and then manually lower timings. After that, I use BLK and voltage increase to raise mem clock. Problem is that I can not get the clock that I am after. If I set BLK to 103 with memory 4200, it will not post. But it will allow me to set mem at 4400 with blk 105, even though I don't want to run at 4600+. I can not then just lower blk or mem clock by 100 or it will not post. I literately have to find a certain blk this board likes. Since the KF, I have to run lower slower mem or really fast and high mem. 
The royals are so nice. I saw a pair for 2xx for the 4000-17. They have a collectors edition with a box of four. Two boxes would be a lot for that HEDT.
I gotta say...this cooler is cooling much better than I expected. It does get heat soaked but not so quick during benches. For everyday use this things is nice. Quiet and keeps this 9900 below 58 at 5.2. Idles in the 20's no matter the clock.

Did you try lummi's b-die config on bios 1.06? works fine on 1.03 as well
 
https://www.youtube.com/watch?v=gj_ZAecVuSc&t=53m30s
 
Should work very well with your kit
 
 

you might try another kit as well just to rule out issues.