I just purchased the ROG Zephyrus M16 2023 GU604VI with the RTX 4070 GPU. I don't see anywhere in the bios or the NVIDIA Control Panel information about Resizable Bar. Do laptops not support Resizable Bar?
On my tuf f15 (2022) there is no Resizable bar option in bios or nvidia control panel BUT as gpu-z shows it is already enabled BUT I wasn't sure about it so download the Nvidia profile inspector and then I saw it was disabled so after enabling it I saw a bit of performance improvement on my laptop. Hope thats the case for your laptop although such limitations and lack of obvious options is completely nonsense especially for flagship devices 🙂