Upgrade to W11 while retaining W10 legacy installation
Upgrade to W11 while retaining W10 legacy installation
If you ever need to switch to the newest GPU, UEFI and secure boot could become relevant.
I'm using Windows 11 on an older BIOS before UEFI, without secure boot, but I have a slightly older GPU called Titan X Pascal that works just fine.
It's been running smoothly since the first week of Windows 11.