More recently within a Fortnite Texture we needed to set a 200GB page file on a spare NVRAM/SSD drive using Directx12
Here is link to Installing a pagefile.sys
The most important action is to untick
Automatically Mananage paging for all drives
All GPU require Texture/Meshes to be of power of 2 to work effectively see post
Power Of 2 Does not work
UE5 does not have the UE Fortnite “Conform Textures” function, which fixes texture errors.
Having a RTX 5090 with 32GB VRAM does not solve this any more than using a RTX 2090 because all this does is add Nvidia CUDA cores.
Lumen and Nanite do not use the extra CUDA cores
Here is link to the official post on Direct X 12 settings
Epic’s GPUlightmass - Development / Rendering - Epic Developer Community Forums