Massive vertex/geometry corruption (triangles stretching across the screen, flickering meshes, broken lighting)

[DoubleDu]

Hello to everyone, TW2 was one of my most anticipated game of the year, and I just can't play it, I can't keep going in those conditions.

I’m getting massive vertex/geometry corruption (triangles stretching across the screen, flickering meshes, broken lighting). To be clear it happened to me already in Avowed but it wasn't constant and it was mostly colorfull light flickering, I could just reinstall my drivers and pray they disappear next time I lauched the game.

This time it's permanent, I tried reinstaling my drivers, disabling ReBAR in the BIOS. But It's still there.
My Specs : RTX 4070 (latest NVIDIA drivers). 128gb RAM. 19-14900k. Windows11

I play KCD2, CP77, Star Citizen and a lot of other games, mostly in full ultra and with RTX ON when it's an option, and I don't experience this kind of glitches anywhere else.

  A short video compilation I made

I've seen people talk about UE5 having huge conflicts with Nvidia drivers. Don't know if it's a good idea to revert to older drivers.

[Trackah123]

Usually these type of glitches occur when you have your GPU overclocked, overvolted or undervolted, or in worst case your GPU hardware is failing in some way.

- Did you ever try Furmark stability or stress test for 10 ~ 30 minutes and do you see the same artifacts there?
- Did you check your Nvidia App -> System -> Performance tab -> is it overclocked there or are the performance limits changed?
- Try classic Nvidia Control Panel -> Help -> Debug Mode (this will change your card to stock speeds etc for testing)
- Do you use any other Video Recording / OSD Monitoring / OSD Overlay / 3rd party Overclocking apps running in the background while you are gaming?

Video Recording : OBS Studio etc
Overlay : Discord overlay, Game Clients Overlays etc 
OC or Monitoring Software : MSI Afterburner, ASUS GPU Tweak, Presentmon, EVGA Precision X1, Rivatuner (older), NVIDIA Profile Inspector, AMD Software: Adrenaline Edition etc

[DoubleDu]

2 hours ago, Trackah123 said:

Usually these type of glitches occur when you have your GPU overclocked, overvolted or undervolted, or in worst case your GPU hardware is failing in some way.

- Did you ever try Furmark stability or stress test for 10 ~ 30 minutes and do you see the same artifacts there?
- Did you check your Nvidia App -> System -> Performance tab -> is it overclocked there or are the performance limits changed?
- Try classic Nvidia Control Panel -> Help -> Debug Mode (this will change your card to stock speeds etc for testing)
- Do you use any other Video Recording / OSD Monitoring / OSD Overlay / 3rd party Overclocking apps running in the background while you are gaming?

Video Recording : OBS Studio etc
Overlay : Discord overlay, Game Clients Overlays etc 
OC or Monitoring Software : MSI Afterburner, ASUS GPU Tweak, Presentmon, EVGA Precision X1, Rivatuner (older), NVIDIA Profile Inspector, AMD Software: Adrenaline Edition etc

Thanks for your answer, after months I finally found the cause I think, yesterday.

Yes I had already done multiple benchmarks and stress tests, including Furmark, I did that already when Awoved came out, I litteraly did a least 5-6 different ones and none ever gave me a single artifact or error. So I moved on and started to believe it was software based, something with the drivers and UE5.

Turns out I had missed one specific stress test : OCCT.
I found out about this software because I started to believe it had something to do with the Vram, and in OCCT you can target the VRAM and aim at a given % of load to stress test it.

Under 75% of load, nothing. But above ? I get 1M errors in less than 2min of test so yeah.. Turns out I've had a hardware problem all along, but only UE5 games trigger this specific part of the Vram with such a heavy load, so it only appear on those games. 

At least that's the theory at the moment ahah.

[Trackah123]

With OCCT its not the load in % but the amount of VRAM, but even if you put 100% testing, for example my card has 16284 MB according to OCCT, but at 100% it only tests 15360 MB because part of the VRAM is reserved for Windows itself. Unless you use iGPU from your motherboard or cpu as primary gpu, then you can allocate more vram to that OCCT test i think.