Hi there guys !

Long time lurker and actual user of nvOC, i need help converting my 21 1080Ti's into rigs with 3 cards using HP DC7900 Small Form Factor pc's as the base for the rigs.
My issue is that although i can boot basically any live distro using a USB stick, i can't boot no matter what nvOC from a usb stick.
Does nvOC needs a UEFI compatible BIOS in order to be booted by older machines ?
Can i convert the image to be non-GPT  and hence bootable on older machines ?

Thanks a lot for your support !