Firmware updates are often released by companies in order to address stability or security issues. However, sometimes, it's these updates themselves which can lead to problems. Such is the case apparently with the new AGESA 1.0.0.4 firmware for AMD Ryzen 7000 series chips. There are reports of a major issue on the 6 core /12 thread (6c/12t) Ryzen 5 7600X where the AGESA update is seemingly disabling some cores. Hence, affected users can experience major performance loss and systems may even fail to boot.
It is noteworthy that not all Ryzen 7600X CPUs may be affected. The bug is apparently only present on those 7600X chips that have their cores across two CCDs (core chiplet dies) as the AGESA update is seemingly disabling one of the core chiplets.
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It is believed that the System Management Unit (SMU) version 84.79.204 is the buggy one and a new SMU 84.79.210 should fix the issue.
MSI & ASRock removed X670/B650 AGESA 1.0.0.4 (SMU 84.79.204) BIOS from the websites.
— chi11eddog (@g01d3nm4ng0) January 7, 2023
It's rumored some 7600X are downcore from 2-CCD SKU with Core0 disabled, with which 1.0.0.4 can't boot. AGESA 1003 is fine.
New SMU 84.79.210 will fix. 1.0.0.4 BIOS still on Gigabyte website. pic.twitter.com/N8wnryyXgg
It is not clear at the moment if other dual-CCD Ryzen chips are also affected. In case it does, it will include the Ryzen 9 7950X, 7900X, and at least some Ryzen 7700X units as well.
Users who have installed this update are advised to roll back to a previous firmware release. You can download the BIOS from their corresponding motherboard's "support" section. Motherboard makers have also started pulling the AGESA 1.0.0.4 update from their websites which is good to see.
In order to check your motherboard model, run "msinfo32" inside Windows Search or Run and note the motherboard model (BaseBoard Product).
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