AMD has announced that they have been able to identify the cause of the defects in their Ryzen 7000 processors. In a Statement to Anandtech the company stated that the issues are due to excessively high voltages that are outside of the intended specifications. In response, motherboard manufacturers have received an updated AGESA version, whose version number is COMBOAM5PI 1070. This new version will soon be integrated into BIOS updates for all AM5 mainboards and will contain lots of new features and also bug fixes. Among other things, it should ensure that the AM5 CPUs can’t take SoC voltages of more than 1.3 volts to prevent the CPUs from the burnout that just became public.
The company has also emphasized that the new AGESA version should not affect the operation of RAM overclocking via the EXPO function. This is quite remarkable, since exactly this function has been responsible for the increased voltage on many motherboards so far. Also in the ChangeLog available to me, the abbreviation RPL (Raphael) does not exclusively refer to the X3D series, which is then called RPLX3D when it becomes exclusive. Thus, AMD also confirms in the new ChangeLog that all current processors of the 7000 series were affected by the said defects. I have exclusively filtered out the most important changes in the ChangeLog for you and deleted the rest. RPL stands for Raphael, RPLX3D for the X3D processors and PHX or PHX2 for Phoenix. Even though it’s primarily about Raphael, i.e. our well-known Ryzen 7000, I’ve also selected a part of the entries for Phoenix and Phoenix 2, because they still hide very interesting information.
Memory management and boot times
For example, there is a lot in the log under PMM for the post memory manager. Overall, it’s noticeable that a lot revolves around the memory, which also provides a credible basis for AMD’s announcement about the memory. This goes to DRAM tracing, which refers to the process of collecting and analyzing data related to the use and performance of DRAM in the computer system. DRAM tracing can be used to monitor memory system performance, identify potential bottlenecks or problems, and improve overall system efficiency. DRAM tracing can also help identify errors or incompatibilities in memory modules or memory controllers and provide appropriate solutions or optimizations.
Safety features for CPU operation and better overheating protection
The entry FWDEV-38540 for the Safe mechanism for RPL-X3Das well as some points about the Deep Sleep. However, it becomes even more interesting with the entry FWDEV-39317 for all Ryzens of the CBS SMU_COMMON ‘PROCHOT Control’ and and ‘PROCHOT Deassertion Ramp Time’ for all Ryzens. Since this is a very interesting point and is directly related to overheating, I will explain it briefly. CBS (Core Performance Boost) is a feature implemented in many modern processors, especially from AMD, to automatically boost CPU performance when needed. The term “SMU_COMMON” refers to the System Management Unit, which is responsible for managing and controlling the performance, power and temperature in a computer.
PROCHOT (Processor Hot) Control is a function related to CBS and SMU_COMMON. It is a thermal safety function used to protect the processor from overheating. When the temperature of the processor reaches a critical value, the CPU or another system component sends a PROCHOT signal, whereupon the processor reduces its power to lower the temperature and prevent possible damage. CBS SMU_COMMON ‘PROCHOT Control’ therefore refers to the control and management of the PROCHOT function within the System Management Unit and Core Performance Boost system to ensure that the processor is operating both efficiently and safely.
PROCHOT (Processor Hot) Deassertion Ramp Time is a time specification that describes how long it takes for a processor to increase its power again after the PROCHOT signal is disabled. PROCHOT is a thermal signal sent by the CPU or other components in the system when the temperature reaches a critical value. In such situations, the processor reduces its power to avoid overheating and possible damage. When the temperature drops back below the critical value, the PROCHOT signal is disabled. The Deassertion Ramp Time indicates how long it takes for the processor to gradually increase its power and return to normal operating conditions. This time can vary depending on the processor model and specific system requirements.
Conclusion
Especially the entries about PROCHOT suggest that a lethal cocktail of different factors might have occurred here. On the one hand there are the too high voltages and on the other hand the possibly not perfect thermal management. What looks quite pleasing are all the entries around the memory, from the boot time up to the DRAM tracing. From this point of view, every user of a Ryzen 7000 CPU should watch out when the board manufacturer provides a suitable BIOS and then flash it immediately.
Source: own
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