@callumventer
How much ram is installed in the desktop?
Have you got the latest [https://www.nvidia.com/en-us/geforce/drivers/|rtx 3090ti msi suprim x driver version 536.40] installed?
Did you mean a ROG STRIX Z690-E GAMING WIFI motherboard?
If so have you got the latest [https://rog.asus.com/au/motherboards/rog-strix/rog-strix-z690-e-gaming-wifi-model/helpdesk_download/|Version 2306.4.3.0 chipset drivers] installed?