Crash when previewing on PC Vulkan SM5

General Issues and Bug Reporting
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1

Summary

The option shown below crashes UEFN

UnrealEditorFortnite-Win64-Shipping_ZZ2u7NivPq
UnrealEditorFortnite-Win64-Shipping_ZZ2u7NivPq474×473 23.6 KB

Please select what you are reporting on:

Unreal Editor for Fortnite

What Type of Bug are you experiencing?

Stability

Steps to Reproduce

Switch to preview shown in image

Expected Result

UEFN doesnt crash

Observed Result

UEFN crash

Platform(s)

PC

2

hi @Wertandrew ,
This happens because Vulkan SM5 was left at 5.2/5.3 to allow support for nDisplay and Multiple Nvidia Graphics cards

Therefore Vulkan SM5 assumes two Graphic cards and this was a fix for a 5.2 function which had made developers buy two very expensive 4090 graphics .cards to use UE Editor Fast using Nvidia Sli and NVlink, very cheap fix to expensive problem.

UEFN/Fortnite 5.5 therefore crashes as Vulkan NOT supported

At least the UE5 MPU fix does NOT affect DX11 or DX12 :smiley:

3

Good feedback, thanks for clarifying. This means its an exposed setting that will crash all editors and needs to be hidden. Hopefully option gets removed to prevent unsuspecting crashes for users in the future