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AMD's new RX 9000 GPUs only officially support UEFI systems
(www.tomshardware.com)
This is a most excellent place for technology news and articles.
UEFI has been the norm for well over a decade at this point. If you're trying to run a brand new GPU in a 15+ year-old system, you've already made many mistakes.
Yeah... I was a little confused myself.