Is there an alternative to Ventoy for booting Windows vhd images from an ntfs partition?

Also, if cpu draws too much power, you will not get the dynamic power boost. Try to limit your cpu wattage. The dynamic boost is up to 15W, depending on how much power the rest of your system uses.

nvidia-smi -pl POWER

This will probably not work with recent driver versions, but might work with 525.

It works when set up with flatseal.

Especially on laptops, where VRAM is halved in comparison to desktop models for whatever reason.

Same for most AMD laptops as well.