can you say what motherboard model and brand / specs the ram is?

 

Edited October 3, 20232 yr by dogmanbird

I think I can finally say that my CTD problem is "solved", by properly limiting the performance of 4090 using MSI Afterburner. My final settings: -200MHz core underclock, -50MHz memory underclock, and power limit = 80%. With these settings, I have completed eight VR flights without CTD, total about 40 hours, three of them about 10 hours each.  

SU13 definitely improved on stability, but probably still stresses the video card too hard in a way may trigger CTD. With a moderate powerlimiting + underclocking of 4090, somehow SU13 stability is enhanced to the degree that my VR flights now are essentially CTD free. The fps loss is about 3fps (like 35 vs 38), a small price I'm happy to pay. 

I kept sim settings mostly Ultra/high, with DLSS=Quality, TLOD=300, most traffic scales near 100%, live traffic on, etc, plus OpenXR scaling = 225%  and my usual addons like RV14A, MobiFlight, FS2FF (for ForeFlight connection), AuthentiKit/V-Joy etc.

Edited October 3, 20232 yr by FlyIce

7 hours ago, dogmanbird said:

can you say what motherboard model and brand / specs the ram is?

MB:  ASUS TUF GAMING X670E-PLUS WIFI 6E 
RAM: CORSAIR Vengeance 2 x 16GB DDR5 5600 (PC5 44800), CMK32GX5M2B5600C36

Currently I reset MB bios to default. I'll test to revert it back to my overclock PBO profile and see what happens. 

 

Edited October 3, 20232 yr by FlyIce

Does the bios post the ram frequency when running the bios defaults? If not, can you see it in a cpu test?

If it's still running at 5600 with default settings, can you try dropping the ram down to 5200 or 4800 for testing? (if you haven't already tried)

It wouldn't surprise me if it's just an unfortunate combination (just at present) of the brand/class of ram and the motherboard bios, which is not quite 100% compatible and will probably get fixed with future mboard bios updates. 

Do you know anyone with some other brand of DDR5 you can temporarily swap with for testing?

A list of ram known to be ok with ASUS TUF GAMING X670E-PLUS

https://www.asus.com/motherboards-components/motherboards/tuf-gaming/tuf-gaming-x670e-plus/helpdesk_qvl_memory/?model2Name=TUF-GAMING-X670E-PLUS

In some instances with a ram combo that's not yet fully supported, people have had success improving or curing gaming instability, by increasing ram and/or cpu core voltages slightly.

Edited October 4, 20232 yr by dogmanbird

Thanks for the info, really appreciate it! I got the 64GB ram and may do a memory test after installing the new ram module. I doubt it's the memory/mb issue though, as the sole solution so far is only about the graphics card.

I restored my PBO overclocking profile in motherboard BIOS last night and had an overnight VR flight completed without CTD. I don't know the exact reason why a slight reduction of 4090 performance made the difference, especially considering this 4090 had no problem running stress test over hours at +200MHz overclocking + 100% power. Maybe MSFS VR just pushes the card even harder than the stress test (MSI Kombustor). 

Glad to see you're probably squared away. I had similar issue. It was OpenXR Toolkit (different app altogether than OpenXR Tools). When I ran OXTK is 'safe mode' the problem went away. So I rebooted MSFS and inside OXTK, no longer in OXTK safe mode, to reduce the things that it was modifying, and no more problem. OXTK had been doing something that was causing the crashes in VR.

The only motion reprojection I use is set in OXTK instead of being turned on in OpenXR Tools, or in MSFS VR options.

I also increased system ram from 16 to 32 and now get a few more fps in VR (Reverb G2). Other programs (like web browsers) are also more snappy fast loading and navigating through forums and such.

 

 

I experimented with OpenXR Toolkit while ago and removed it since I found the benefit very obvious for me. I'm just running OpenXR + WMR, except I bumped rendering scale in OpenXR to 225% to maximize G2 clarity. It's a great relief that I can now fly VR without worrying about random CTD, and get ready for the Quest 3 coming next week. 

I did rip one benefit from all these torture tests though, as I discovered the pleasure of being a sitting or standing passenger in RV14 flying on AP. Over the roof or on the wing, those sensation and views in VR are breath-taking...  

Edited October 4, 20232 yr by FlyIce

9 hours ago, FlyIce said:

Thanks for the info, really appreciate it! I got the 64GB ram and may do a memory test after installing the new ram module. I doubt it's the memory/mb issue though, as the sole solution so far is only about the graphics card.

I restored my PBO overclocking profile in motherboard BIOS last night and had an overnight VR flight completed without CTD. I don't know the exact reason why a slight reduction of 4090 performance made the difference, especially considering this 4090 had no problem running stress test over hours at +200MHz overclocking + 100% power. Maybe MSFS VR just pushes the card even harder than the stress test (MSI Kombustor). 

No worries, i know it can be frustrating trying to locate the problem.

The ram might be right on a knife edge regarding it's stability with the current bios. Slowing the clock of the gpu is probably somewhat indirectly affecting transfer speed from components like ram, which can basically ease up a little too and less likely to fall over.

 

I have the exact same problem. I use a G2 and Pimax Crystal. Recently I experience a CTD continuously. I might get 20 mins, 10 mins but I will get the CTD. Never happened before. Did a complete reinstall of windows and sim but no change. 

4090 GPU running a 24 hour burn test with no issues.

Can have CTD in 2D after a longer time.

 

Any remedy

Have you tried what I did, underclock and power-limit a bit on 4090 using MSI Afterburner? To me that works well and I have been CTD free since. 

I want to add a happy ending of my CTD saga. A few days ago my PC all of sudden began to have very frequent bluescreen of death and led me to suspect the RAM might have gone bad. Fortunately I already bought two new 32GB sticks weeks ago. I replaced the old 2x16GB with the new 2x32GB and all have been perfect. I didn't even underclock 4090 and I got no CTDs in MSFS so far. 

So in the end, I might be suffering from a pair of subpar memory sticks slowly gone bad. I regretted that I didn't listen to @dogmanbird to check and replace the memory early on - could have saved me a lot of time and agony from trouble shooting. 

Happy ending! 😊 

Yes, yes and yes,

i7-4900k, 32g, 3080, HP G2, SPAD and all Saitec intruments, 3 x 60” Mon, 2 x touch screens 

If your using VR I think EVERYONE will say yes.. 😞

Tried reinstalling MSFS, OpenXR and Tool kit (MANY TIMES!), removing XMP, used DDU to install drivers, many different versions but still get them.  I maybe able to fly for hours with no problem, come back the next day, no changes to the system and crash…. I cant see any logic to it… 

Been using Windows since V1.1 and actually cut code for windows working for MS many years ago, being ‘flying’ with MSFS since 1986 so I understand the core systems very well… BUT hasn’t helped in the slightest! LOL

Lets hope MS/Asbo can get it fixed in 2024?

 

didnt release I was in guest mode when I posted