Intel has revealed the detailed investigation results, pinpointing the cause of instability in the Core 13th/14th Gen Raptor Lake CPU. Intel has named this issue Vmin Shift Instability, characterized by a clock tree circuit vulnerable to instability when voltage and temperature exceed normal levels. Intel has identified 4 scenarios that could lead to this issue.
The motherboard delivering power higher than Intel’s recommendations. Microcode algorithms enabling the CPU to operate at high performance in high temperatures. Another part of the microcode algorithm requesting high voltage in frequency and time intervals that could trigger Vmin shift issues. Code in microcode and BIOS also requesting high voltage when the CPU is running lightly or not at all.
The first issue is resolved by setting the motherboard to use Intel Default Settings, while the second is addressed in a microcode update scheduled for June (0x125), and the third will be fixed in a microcode update in August (0x129). Intel has announced plans to release a third microcode update (0x12B) soon and is currently testing it with various motherboard partners for the next BIOS update.
All issues are exclusive to the Raptor Lake desktop CPUs and do not affect the 13th/14th Gen notebook CPUs, as well as newer models like Lunar Lake and Arrow Lake.
Source: Intel, Tom’s Hardware
TLDR: Intel’s investigation reveals Vmin Shift Instability causing Core 13th/14th Gen Raptor Lake CPU instability. Solutions involve motherboard settings, microcode updates, and forthcoming BIOS updates. Issues are limited to Raptor Lake desktop CPUs, not affecting notebook CPUs or newer models.
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