Intel Core 13th and 14th Gen Vmin Shift Instabilty Update - New Microcode Update (0x12F)

Data Center & Cloud Intel® Cloud Services
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As part of its effort to continually improve its products, Intel is releasing a new microcode update (0x12F) supplementing the 0x12B microcode update released in September 2024. This new microcode further improves system conditions that can potentially contribute to Vmin Shift Instability on Intel Core 13th and 14th Gen desktop-powered systems. Intel is releasing this 0x12F update based on Intel’s investigation of a limited number of reports regarding systems continuously running for multiple days with low-activity and lightly-threaded workloads.​

The release of the 0x12F microcode does not alter the root cause determination for the Intel Core 13th and 14th Gen desktop processor Vmin Shift Instability issue: *https://community.intel.com/t5/Processors/Intel-Core-13th-and-14th-Gen-Desktop-Instability-Root-Cause/m-p/1633442*​

Based on microcode testing and validation, Intel has identified no measurable performance impact with the 0x12F microcode update*.​

Intel continues to recommend users with Intel Core 13th and 14th Gen desktop processors ensure they have the latest BIOS updates installed and utilize the Intel Default Settings profile in their BIOS to mitigate Vmin Shift Instability risk with their systems.

Small Print:

*Intel’s internal testing comparing 0x12F microcode to 0x12B microcode – on Intel® Core™ i9-14900K with DDR5 5600MT/s memory- indicates performance impact is within run-to-run variation (i.e., Cinebench R23.200, Speedometer 3, WebXPRT4 (v3.73), and Crossmark)**. For gaming workloads on Intel® Core™ i9-14900K with DDR5 5600MT/s memory performance is also within run-to-run variation (i.e., Shadow of the Tomb Raider, Cyberpunk 2077, Hitman3: Dartmoor, Total War: Warhammer III – Mirrors of Madness)***. System performance is dependent on configuration and several other factors.

**Processor: Intel® Core ™ i9-14900K, Motherboard: Intel Raptor Lake Reference Board (M40919-101), Memory: 64GB at 5600MT/s, Storage: Samsung* MZVL2512HCJQ-00A00, Graphics: Intel® UHD Graphics 770, Graphics Driver Version: 32.0.101.6314, Display Resolution: 1280x1024, Operating System: Windows 11 (version 26100.2161)

***Processor: Intel® Core ™ i9-14900K, Motherboard: OEM board, Memory: 2x16GB at 5600MT/s, Storage: Samsung* MZVL2512HCJQ-00A00, Graphics: MSI* RTX 4090 Suprim X, Graphics Driver Version: NVIDIA* v572.16, Display Resolution: 1920x1080, Operating System: Windows 11 (version 26100.2161)

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Is there any way of upgrading the microcode to 012F if the manufacter doesn’t release a bios upgrade for the motherboard ?

Maybe via a batch file ?

Owner of a Z690 MB running on 0x12B .

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At your own risk, yes. You can swap out microcodes in the firmware package and flash it either using the built in software options if the firmware doesn’t verify packages, or through the hardware chip interface if it does. It’s not something for a beginner.

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There’s also a software method. Doesn’t look like 0x12F has been prepared yet, but I think there is enough info there for you to be able to do it yourself. Also don’t worry even though its meant for laptops since they often get bios updates much less than desktops, it still works on desktops. It updates the ucode as soon as windows loads rather than on boot but, yeah, it definitely still works, just in a different way.

Also you could contact the guy. Seems very knowledgeable and also very helpful.

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The link I gave you before, this one:

https://shorturl.at/7LBzV

Its been updated with the most recent ucode. So with it already prepared, its a really simple procedure. Its explained in the post. You should be able to do it in <5 minutes.

I haven’t done it myself, I’ll just wait for the bios update. However, if you cannot do that for whatever reason or are just very cautious and want it applied asap, this is an option.

Like I said the ucode will get loaded with windows rather than at boot.

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Will be looking out for an update on my Z790-E Strix then.

Recently moved to the 14900K and have had some wierd hiccups now and then (even with P1 and P2 253W limit)

Other than that, always been a happy owner of Intel processors.