I5 6600k max oc vcore

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Niruvius

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Aug 30, 2015
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Hi what is max "safe" vcore for i5 6600k if i plan to keep it for 3+ years?
Also what is max "safe" temperature for it?

I want to test what is my cpu capable of and will run it at stock speeds after i see what it can do untill i need that oc.
 
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synphul
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Your voltage limit would be around 1.3 V, pushing further than that it's not a safe call to make. For everyday use that would be a recommended voltage.

About the temperatures..... the thermal limit of the CPU is around 90C , surpassing that parameter , your processor will start throttling. As for your target temperatures, you should not exceed 80C +, anything under this being considered safe.

Run Prime95 stability test, after increasing your multiplier: http://www.mersenne.org/download/
You will continue to Overclock until the CPU gives signs of instability (freezes, crashes, blue screens, high temperatures etc.) , then downclock to the previous , safe frequency.
 
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I think with Skylake, the max vcore target is now a bit more.
Haswell was commonly 1.30.
Skylake seems to be more like 1.40.
silicon lottery is an outfit that bins chips.
It seems that their limit is around 1.40 for their Skylake products.
http://siliconlottery.com/collections/all

Their vcore for haswell-E is still around 1.30

Do stress testing with an app that reflects common usage patterns.
Something like OCCT.
Others like Prime95 generate heat, but use only a subset of less used instructions.
 
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Solution


I have a 6600k and I'm running 4.4GHZ at 1.35v. My uncore is the default 3.5GHZ. Is there you a reason you bumped that up to 3.9GHZ?
 
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I have a Thermalright HR-02 Macho rev.b. CPU Cooler and i overclocked my 6600K to 4.4GHz sit the max voltage being 1.248 while playing GTA V Every setting on very high and Antialiasing & Anistropic filtering on the max. The max temp i hit on my CPU was 46C 😛

 
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the post you replied to is a year old lol.

i got my 6600k to 4.4ghz with them same voltage as you, but to get to 4.5ghz i had to increase it to 1.35v.
 
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I can see on the CPU-Z picture at the right that it is written: Core Voltage 1.416 V (under load). As the Core Voltage goes down under load (even after tweaking LLC), this would correspond to a setting of CPU VCore manually in the BIOS to around 1.45 V to start with (i.e. at idle). So where do your "1.36v" claim fit in all this? I can run at 4.7 GHz with VCore set manually in the BIOS at 1.40 V and show you a couple of pretty pictures proving it. But after 2 hours of Prime95 heat test, the rig shuts down to protect the CPU from damage because the temp is over 85 C. So what's the big idea behind this post? Bravado...?
 
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Mine defaulted to 3.9 Ghz on a new installation. Couldn't tell you why
 
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With proper cooling (otherwise the CPU will just automatically shutdown for protection), I strongly believe that you could run a 6600K at 1.50 V for over 10 years without any significant degradation of its performance. I write this from experience based on previous CPUs and the fact that their longevity tends to increase with every new generation. Even my NVIDIA GPU took 8 years to finally give up and when I opened the XPS420 Dell case for the very first time ever, I discovered that the fan was no longer moving under all the dust built-up (probably the root cause). But the 9 year old Intel Q6600 core 2 duo quad CPU was still giving me exactly the same benchmark figures (I saved the old versions of that time for comparison... he, he) as in 2007 even with extremely obstructed (limited) cooling (air barely moving through). The old thing just couldn't die on me. In fact, I long stopped saying that I will upgrade as soon as it dies simply because I intent to upgrade within my lifetime. Even my 1980 Motorola 68k is still working... like the Ford T of CPUs.

The critical voltage of "all" (i.e. including real duds) 6600K / 6700K starts "from" 1.60 V minimum. INTEL shaved off a further 5 % margin for comfort (as they always do) to arrive at 1.52 V, but they know that it's very safe. So running such a CPU at merely 1.48 V (~4.9 GHz) is really like a walk in the park... a kiss in the dark (with suitable cooling of course). And even then I would certainly not say "I will upgrade when the thing starts losing performance..." let alone "when it dies on me" because I won't enjoy looking like a fool decades later with "the thing" in question still ticking at the same performance level as it did on day one. Think about this, how many threads or even posts have you ever read that even remotely mention CPUs losing performance (in any measure) due to their outrageously high (and/or barely stable) overclocking. Even my GPU would not count because it died from its fan no longer working, not from any overclocking. So, five years you will certainly get out of your CPU, whatever you do with it... well almost ;-). Thing is, five years is such a long time for electronics these days... and prices are still falling.

The increased temp. reached by going a mere 100 MHz higher, from 4.6 GHz to 4.7 GHz, is far too high for the meager benefits it provides, and it clearly shows the CPU's limit IMO. This is why I stay at 4.6 GHz. Better safe than sorry...

Here are my current, and ultra stable, BIOS settings for i5 6600K on Gigabyte GA-Z170XP-SLI:
[1] - CPU Core Ratio: 46
[2] - FCLK Frequency For Early Power: 1 GHz
[3] - Uncore Ratio: 46
[4] - CPU Flex Override: Disabled
[5] - Intel Turbo Boost Technology: Disabled
[6] - CPU Enhanced Halt (C1E): Disabled
[7] - C6/C7 State Support: Disabled
[8] - C8 State Support: Disabled
[9] - CPU Thermal Monitor: Enabled
[10]-CPU EIST Function: Enabled
[11]-Voltage Optimization: Enabled
[12]-Residency State Registration (RSR): Disabled
[13]-Hardware Prefetcher: Enabled
[14]-Adjacent Cache Line Prefetch: Enabled
[15]-Extreme Memory Profile (X.M.P.): Profile 1
[16]-System Memory Multiplier: 32
[17]-Memory Enhancement Settings: Relax OC
[18]-Channel Interleaving: Enabled
[19]-Rank Interleaving: Enabled
[20]-CAS Latency: 15
[21]-tRCD: 17
[22]-tRP: 17
[23]-tRAS: 28
[24]-Command Rate (tCMD): 1
[25]-CPU VCore Loadline Calibration (LLC): High
[26]-CPU VCore: 1.355V
[27]-CPU VCCIO: Normal
[28]-CPU System Agent Voltage: Normal
[29]-PCH Core: Normal
[30]-DRAM Voltage (CH A/B): 1.360V
[31]-Internal Graphics: Disabled
 
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