Igor’s laboratory report AMD’s new Ryzen 7000 burnout firmware fix, AGESA ComboAM5 patch 220.127.116.11, addresses an additional bug with Ryzen 7000’s temperature control system. A new combo patch sets the forced SoC voltage limit to 1.3v and packs a new SMU bug fix to keep the processor from exceeding thermal specs.
AMD hasn’t given any specific details about this issue, but apparently there are optimization issues (in previous AGESA microcode updates) surrounding the temperature control system within the SMUs of Ryzen 7000, and TJmax ( That is, the chip did not work properly when it reached that temperature. sealing). We don’t know the extent of the potential damage this caused, but it’s highly likely that this SMU bug of his in conjunction with dangerous SoC voltages caused him to burn out his Ryzen 7000.
Issues specifically related to Ryzen 7000 CBS SMU_COMMON ‘PROCHOT Control’, and PROCHOT deassert ramp time. The former is a thermal safety mechanism that protects the CPU from overheating when the CPU reaches its target thermal limit. The SMU issues the PROCHOT signal. This reduces the power and frequency of the CPU to keep it below thermal thresholds and prevent damage.
The latter is the inverse of the former mechanism, allowing the CPU to boost power and frequency again when thermal limits are not reached (and the PROCHOT signal is inactive). Because the system is time-based, the CPU can gradually increase power and clock speed when the temperature allows. This is a key feature of his SMU, ensuring that temperature fluctuations don’t cause the CPU’s clock speed to bounce all over the place, resulting in inconsistent performance.
According to AMD patch notes in Igor’s report, both mechanisms had no effect on Ryzen 7000 CPUs with previous AGESA code updates. I’m not sure what exactly this means, but SMU seems to allow CPUs to exceed his TJmax at least a little bit, and somehow he’s causing performance issues with CPUs below TJmax.
Again, I’m not sure how widespread this problem is. Still, it’s a big enough issue to strongly recommend all his Ryzen 7000 users to upgrade his BIOS/UEFI on their motherboard to a version that includes AMD’s AGESA ComboAM5 patch 18.104.22.168 ASAP. . The firmware update also offers many other bug fixes, including boot time improvements, deep sleep fixes, curve optimizer fixes, large DDR5 memory bug fixes, and more.