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Intel issues new microcode to fix rare Vmin Shift crashes on 13th- and 14th-gen CPUs

  • Intel released microcode update 0x12F in September 2024 to fix rare Vmin Shift crashes on 13th- and 14th-generation desktop processors, excluding Core Ultra 200S series.
  • This update follows the major 0x12B fix that addressed voltage management bugs causing instability and accelerated CPU wear in Raptor Lake chips during light workloads.
  • Vmin Shift instability caused clock duty cycle shifts and hardware damage after prolonged low-activity tasks, prompting BIOS updates incorporating 0x12F from multiple motherboard vendors.
  • Intel confirmed 0x12F adds fixes for rare edge cases without measurable performance impact compared to 0x12B and recommends BIOS updates using Intel Default Settings to reduce risk.
  • Intel extended warranties by two years for affected CPUs, advises timely BIOS updates, and notes microcode prevents crashes only in unaffected units while damaged CPUs require replacement.
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Hardwareluxx broke the news in on Wednesday, May 7, 2025.
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