AMD AGESA 1.2.0.5 BIOS may cause performance loss
AMD previously released AGESA 1.2.0.5 microcode for Ryzen/Athlon processors. However, according to multiple reports, BIOS updates using the new code may have serious problems, including large processor performance, memory instability, and inability to overclock.
Many users reported on Reddit, The Ryzen processors used in benchmarks such as Geekbench 5 and Cinebench R20 experienced a drop in processing performance, the processor temperature may also become higher or a WHEA 19 error occurs. According to DeskModder, AGESA 1.2.0.5 is prone to severe PBO and memory error issues, if you use high-frequency DDR4 memory, it may not run stably under the XMP profile.
It is understood that for some users using AMD Ryzen 9 5900X/5950X processors, in single-core and multi-core workloads, the clock may drop by 100MHz/150MHz, respectively, and the performance of the second CCD will suffer greatly. In addition, there will be many limitations in overclocking, such as some voltage adjustments, the scope of PBO menu customization is narrowed or missing.
At present, ASUS has completely stopped the official BIOS update for AGESA 1.2.0.5 and will skip it directly and use AGESA 1.2.0.6b instead. Most motherboard manufacturers provide BIOS updates based on the AGESA 1.2.0.5 microcode on their official websites, including MSI, Gigabyte, and Biostar. In fact, AGESA 1.2.0.4 had many problems related to processor performance before, and AGESA 1.2.0.5 not only did not improve, but the problems became more. Given its impact, before AGESA 1.2.0.6b arrives, it may be safer to fall back to AGESA 1.2.0.3c, which is a relatively stable version.
