In macOS 13.3, WiFi and most Ethernet devices stop working when AppleVTD is enabled and system has more than 16GB memory. This affects motherboards that have one or more Reserved Memory Regions in their DMA Remap table (DMAR). The problem exists even if Reserved Memory Regions are removed and a substitute SSDT-DMAR.aml is injected.
This quirk side-steps the problem, allowing WiFi and Ethernet devices to function once again. It restores the behavior that existed in earlier versions of Ventura.