UE5 won't launch on my AMD hardware

Development Getting Started & Setup
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1

It’s been absolutely impossible to launch UE5 on this PC and I’m starting to suspect there is some fundamental incompatibility with my CPU. Let me explain:
After installing UE the launch button does nothing. By watching Task manager I can see a crash handler pop up and disappear, and that’s it. I verified installation, uninstalled and reinstalled launcher and editor. Tried opening it via VS, tried opening with compatibility mode, and a number of othher attempted solutions. Then I started to get every update and package under the sun that might be affecting. Got every .Net library, every C++ module on VS. Tried /sfc scannow. Eventually launching went from doing nothing to give me error 0xc0000142, which is a generic windows error. I figured it might be corrupted data on my windows 10. After trying everything I could, I reinstalled windows 10 on a formated disk. And even with a brand new windows, it still happens. Here is my hardware:
CPU: AMD Phenon™ II x4 965 Processor, 3400Mhz, 4 Cores
Motherboard: M5A78L-M/USB3
RAM: 16 GB
GPU: NVIDIA GeForce GT 1030

It’s kind of old, but UE5 is the ONLY problem I have with it. I use ZBrush and Photoshop daily, Unity works fine, and every game runs fine with a single exception: Fortnite. I tried it weeks ago and the exact same issue happens, it won’t launch.
Now when I reinstalled windows 10 and tried to open UE5 again my system had nothing except:
-Windows 10 updated to 22H2
-My NVIDIA driver updated to the latest, 536.67
And that’s it. I don’t believe it’s a software issue, but a fundamental error going on between UE and my CPU.
One last info: when I try to launch UE by building a game on VS, the build works but Unreal crahses, or I should say UnrealEditor-Core.pdb won’t load, giving me this error:
Unhandled exception at 0x00007FFE9■■■4F46 (UnrealEditor-Core.dll) in UnrealEditor.exe: 0xC000001D: Illegal Instruction.

I’ve tried pretty much everything at this point and I’m kinda desesperate. I’ll try to build UE from source now. Then I’ll try reinstalling windows again and launch UE without any windows or NVIDIA update. I don’t know what else to do, I’m just an artist and this is above my head.

2

Just to add: no UE5 packaged project opens on this machine.
So all UE5 things (editor, Fortnite, any packaged project) suffer the same fate here.
As it seems to be due to that unhandled exception on the engine core .dll, saying illegal instruction, I’d guess something on the lowest levels, related to this CPU instructions handling?

3

Sorry for bumping it up without answering anything, but i’m stumbling across this issue too. Except i have…
CPU: AMD Athlon II X2 250, 2 cores, 3000Mhz
Motherboard: ASRock 960GM/U3S3 FX
RAM: 10 GB
GPU: NVIDIA GeForce GT 1030 GDDR5
OS: Windows 11

Pretty much similar specs and same error. I tried installing all the C++ redists, updating everything, still didn’t get to the point where i’d have to reinstall the OS (thanks for stopping me from that). It has to do something with AM3 socket maybe?

4

It seems from information I have found, that you need specific minimum generation processor… For SSE4.1 instructions support

I was digging this out myself and using WinDbg found that it crashes on “0xC000001D: Illegal Instruction.” calling instruction roundpd xmm0,xmm0,1

RoundPD is SSE4.1 instruction

SSE4 - Wikipedia

" SSE4. 1 is supported on Intel Core 2 (“Penryn”), Intel Core i7 (“Nehalem”), Intel Atom (Silvermont core), AMD Bulldozer, AMD Jaguar, and later processors . SSE 4.1 and SSE4. 2 are supported on Intel Core i7 (“Nehalem”), Intel Atom (Silvermont core), AMD Bulldozer, AMD Jaguar, and later processors."

So not on my Athlon too

Strange unreal docs doesn’t mention this. I guess it is not possible to make it work on older CPUs.

https://questions.satisfactorygame.com/post/6555a57dd0053b102f18e0cb

This is also talking about need for SSE in UE5 game.