What is the maximum safe voltage for an i7-6700K under continuous operation?
What is the maximum safe voltage for an i7-6700K under continuous operation?
Hi guys,
I just placed my order for all the parts needed to overclock my old 6700K. I'm currently running it at 4.5 GHz and have previously reached 4.6 GHz with around 1.4 vCore (exact numbers fading). Ignoring temperatures, what's the maximum safe speed I can maintain continuously for 24 hours over a period of 1 to 2 years? The CPU is already three years old.
From what experts suggest, a voltage of about 1.43V seems acceptable for long-term use, but someone more experienced mentioned they could run an 8700K at that level and believes newer chips are slightly more sensitive. So it should be okay? Possibly even up to 1.45V?
I've experienced issues with a 6700K and spent several years overclocking it before upgrading. I prefer sticking to 1.4v, though some have tried 1.45v, which is beyond my tolerance, especially for long-term performance. On the 8700K running at 4.9GHz and 1.278v consistently, I’m comfortably within specifications. Reaching 5GHz pushed me to 1.35v, which was too intense both in terms of heat and stability. At 4.9GHz it’s ideal for temperature control with minimal variance between the two speeds...
As noted by vMax, there are 1.43 edges into sensitive areas of Core voltage along with the degradation trend for 14 nanometer processors. Each microarchitecture comes with a “maximum recommended vcore.” The figures below reflect the agreement among knowledgeable, seasoned system builders, reviewers, and overclockers. Vcore remains a debated subject; some argue the values are too restrictive, while others consider them excessive. Nevertheless, considering the personal interests of others, most users concur these numbers are reasonable, balanced, and suitable. Below are the values for microarchitectures ranging from 14 to 65 nanometers since 2006.
We understand that prolonged exposure to high voltage and heat can harm electronic components. Therefore, when adjusting Vcore manually in BIOS, setting too much Core voltage or temperature may lead to faster "electromigration." This process damages transistor junctions and circuit paths at the nano-scale, eventually causing more frequent blue-screen errors. Even if stability seems restored by raising Vcore further, it only speeds up degradation. The safer approach is to lower overclocking and Vcore, which can help maintain stability and slow down wear.
Each microarchitecture has its own degradation pattern. CPUs generally face greater risks from electromigration as they shrink in size. However, Intel’s 14 nanometer design benefits from FinFET technology improvements, enhancing voltage tolerance. For instance, 22 nanometer processors in the 3rd and 4th generations won’t handle the higher Core voltages of older microarchitectures.
Here’s a comparison of degradation curves for 22 nanometer 3rd and 4th generation chips versus 14 to 9th generation 5th through 9th generation CPUs:
Degradation curves depend on “Vt (Voltage threshold) Shift,” measured in millivolts. Users cannot directly track Vt shift, but it indicates the likelihood of permanent performance loss over time, negatively impacting system reliability.
Regarding overclocking, excessively high Core voltage leads to excessive power draw (watts), raising core temperatures during intensive tasks—both factors contributing to Vt shift. Voltages that cause significant Vt shifts should be avoided.
Keep in mind the broader context of overclocking. For example, a 4.5 GHz processor versus 4.6 GHz represents less than a 2.3% difference, which barely affects overall performance. Pushing beyond recommended Core voltage and temperature isn’t justified unless you’re seeking marginal gains, as it risks long-term damage.
That's the term I use to describe it, a scientific explanation.
Nahh, explanation is another word for point of view or opinion. What CompuTronix spouts is called 'The Truth'.
Honestly, I'd take a trip over to Asus ROG forums and take a peek at any and all overclocks using the 6700k. Those boys over there don't play around, they seriously get into squeezing every last erg out of a cpu. At the lowest possible voltages. OC theory is all the same, bios all the same, cpus all the same, mobo's all the same, only the names change. OC on an Asus mobo is exactly the same on Giga or MSI or ASR mobo's, just different names. A small tweak to ring voltages, bump in amperage limits, VID voltage differences, slight change to LLC, even minor things like dropping PLL to 1.7 instead of 1.8 can all have impacts on vcore and stability and temps. Even changing ram speeds, ram voltages, system agent voltages can have an affect. There's a LOT more that goes into getting higher clocks than just bumping the turbo limits and multiplier and corresponding bumps to vcore.
At 4.6GHz my i7-3770K is sitting quietly at 1.216v, at 4.9GHz it was at 1.308v and 5.0GHz at 1.320v, so sat 24/7 stable at 4.9GHz for 6 straight years, because I liked the temps better.
For 4.6GHz, you shouldn't be hitting 1.4v at all, there's tweaks and other settings that you need to look into.
Hey. Is there a link to their forum. I have not found one and probably it was it but didnt look official.
If you're looking for details about OC on a 6700k, there are likely several places to find it, though it might be spread across different sections. I made some adjustments to my own OC, focusing more on understanding which settings work and where they affect performance rather than just the numbers. If someone finds a full bios online, don't just copy it—consider how your CPU differs, what settings were applied, why they mattered, and what outcomes you saw. Then adapt those changes to your own setup. Also, keep in mind any name changes between brands and familiarize yourself with LLC, ring voltages, and video specs.