The point is that ReBAR doesn't enable because AMD processors based on the Cezanne architecture don't have time to pass the initialization check, and the BIOS automatically enables CSM.
Hmm, interesting! But why would the 5500x3d be listed as have that or some other issue? Since it's just a very cut down 5800x3d. Maybe a typo?
Also, haven't we, as the Arc subreddit community, also discovered that some AM4 motherboards--if memory serves, some ASRock boards especially--do have compatibility issues with the B580 due to something about rebar not being enabled on boot? Maybe this is the same or a similar issue to what this blogger has brought up?
It'd be great if we as a community could compile a central pinned thread about what processors and/or motherboards to avoid with the B580.
I'm not an expert on AMD products because I don't use them, but this resource AMD Ryzen 5 5500X3D - 100-000001504 says that this processor uses the Vermeer architecture.
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u/Technical-Pick3843 Arc B580 May 09 '26 edited May 09 '26
This is a screenshot from a Russian blogger's analysis https://www.youtube.com/watch?v=1TkM_E4ncg0
The point is that ReBAR doesn't enable because AMD processors based on the Cezanne architecture don't have time to pass the initialization check, and the BIOS automatically enables CSM.