Hi there, I have i9, 12900K, 3090 24GB, 64GB DDR5 RAM, 1200W PSU.
This rig worked great for over two years, not a single problem using unreal engine.
But now, for some reason, whenever I try to render anything using MRQ or legacy. System just crash, not the unreal, whole system crash. all displays turn black, I hear my youtube video playing for a few seconds then it stops. I see my CPU lights indicating as ON but there is nothing like ON happening.
I need to force shutdown the PC and turn ON again. This happens on every project, every unreal engine version, doenst matter if the scene is complex or not.
I have one other PC, same thing happens to it aswell. It has i7 13th gen, 32GB ram, RTX 3070TI and I think 650W PSU.
What might be the issue? It is affecting my work, I can not do anything. Please someone help.
wow, that could be anything from a bug to a post process saying ‘huh?’… i’ve always had a problem with renderer and just used nvidias screen capture while i waited for renderer to be fixed… but lots of other people have no problem i guess, might try to reinstall the engine or use another version… might try messing with your settings in renderer
I agree, the cause of this issue could be related to multiple things, both from UE, and the user’s system.
The described behaviour reminds of a similar problem I saw, involving a badly mounted GPU. However, since it’s also affecting another PC, that points the problem more in the direction of UE’s latest updates.
I think the best course of action here, besides a clean-up of GPU drivers would be a a full uninstall/reinstall of all Epic software in both PCs:
- First, uninstall the engine, launcher, asset packs, etc
- Next, open the registry directory HKEY_CURRENT_USER\Software\Epic Games\Unreal Engine\Builds, and delete any build entries
- Finally, delete the folders %userprofile%\AppData\Local\UnrealEngine and %userprofile%\AppData\Local\UnrealHeaderTool
- After that, no elements related to UE should be left in your system
- Now, reinstall UE launcher from scratch, and only add the latest, most stable version of the engine (at the time of this post, that would be 5.6)
- After the process is complete, test rendering with MRQ again
I found a solution that worked for most of my scenes.
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I suspected very early that its a GPU overheat issue, but since I wasn’t seeing a gradiual increase in GPU temp so I rolled that out. But I still wanted to give it a try.
I installed MSI Afterburner.
on the MSI afterburner,
I set the fan speed of my GPU to 100%, so all three fans were at 100 speed, keeping the GPU cool.
I set the max temp to 86°C ( It was 83 by default) . Anything below 88-90 is generally safe for GPUs.
I tested the scenes that were shutting down my PC, Most of them worked(Only one didnt, that too worked for a while and then shut down happened at some point). I noticed that Unreal was pushing the GPU so much during rendering that it was going from 60°C to 75°C+ in an instance, while Fans are at 100% speed. I can imagine that auto fan control couldn’t keep up with the temperature, and probably that’s why it was shutting itself down.
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You do not need to keep this setting on the MSI afterburner; you can revert back these changes after the work is done.
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This shutdown thing was happening when I had volumetrics in the scene, like Fog, clouds, VDBs, particle-based/Simulated water system. There were packs used like “Ultra volumetrics,” “Ultra dynamic sky,” “fluid flux,**” “**Waterline pro,” etc . and other thing I do is to render at 120 screen percentage. So I was actually pushing GPU to the extreme limit.
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I mentioned everything here for the record. I, too, tend to forget things xD, so I am helping myself too.