Doesn’t that suggest a core that’s failing on the low end of the power curve? Disabling C-states costs you money and don’t really net you much performance. I’d expect SVID set to Intel Failsafe to fix it as well, at the expense of power and heat. It might be worth doing a warranty exchange.
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I hadn’t thought about it and I was somewhat concerned.
Then I research a bit more and apparently the cost of energy doesn’t seem to be such a big issue if the PC isn’t on all the time. Also saw that reports of random reboots with some of the C-States enabled are not uncommon. I found this solution somewhere, and so far it’s working. No any reboot during idle yet.
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I’ll have a look at playing with the C states in case it helps me too. However, I’ve made my system much more stable by increasing the CPU performance settings, not reducing them.
The reboots were more frequent when idle and never happened during stress tests. So I’m coming round to Wendell’s theory about instability when boosting from low power states.
As a quick example, if I turn on Automatic Overclock in Intel’s XTU app and have a few background apps open (eg PDF and a photo) then the system is stable. So increasing the P and E core ratio and Power/Current limits makes it more stable, not less.
I’m still playing with settings to find the optimum configuration, but for me turning down the CPU and memory settings makes it worse not better.
TBC…
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Just to mention the fix for my woes in case it helps others. Playing with the C-State options in the BIOS turned the PC from ‘maybe 6hrs between crashes’ to ‘still running after 5 days and getting bored now…’. As blackouter above said, enabling the C-States control and disabling the C8 and C10 states has made my PC rock solid. The impact on CPU temps and Vcore voltages is minimal when stress testing (ycruncher and Prime95).
Finally for belt and braces, I manually set the Power 1, Power 2 and IccMax limits as per the Intel datasheet for the 13600K (181W, 181W, 200A)
TLDR: DIsable the C8 and C10 C-States in the Gigabyte BIOS for a 13600K.
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Update
Gigabyte recently released (actually on January 14, 2025) a BIOS update (F20) for this motherboard, and the update notes explicitly mention the issue with reboots when in idle state.
“Addresses random system shutdown while idling in Windows OS”
So, I updated the BIOS and set the C-States to Auto mode, and I haven’t experienced any more reboot issues.
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