7700K overclocking - 1.25 V with high temperatures

Hello

Today I've bought 7700K as a little upgrade from 6600K. I'm still new to overclocking, however I was curious how good or bad this particular chips was. Motherboard is Asus Sabertooth Z170 S, air cooled. I might put too small amount of thermal grease (Thermal Grizzly Cryonaut, it's very dense...).
In UEFI I set 1.25 V and it resulted with rather high temperatures (~87 C), and I was like "&*% this ^#&* I'm going to give you back to the shop tomorrow" (I am used to 1.35 V in UEFI for Skylake and that is what I was expecting). However, it turned out that I can multiply freq by 49x100 MHz so I'm peaceful now. (stable after 1h in OCCT)
However I am a little concerned why are those temperatures that high? It of course might be my fault but as I've checked most people reach above 1.3 V without thermal problems.
What I'm more concerned about - are values I'm typing in bios real? Both UEFI and OCCT state that VCore is 1.25 (via built-in HW Monitor), however CPU-Z and HWMonitor itself display unstable VID as something above 1,31 V.
Seeing 4.9 GHz at 1.25 V seems a little unreal for me. For 1.31 V it is more possible. (according to my knowledge which I've gained from last 1 hour of googling).
And last thing: 6600K run in the same set at 1.35 V at 4.6 GHz and it had never went beyond 80 C.
PS: Why the heck VIN0 has a value of 60 kV??? :D

Thanks for all suggestions!
Reply to Mustella
6 answers Last reply
More about 7700k overclocking high temperatures
  1. One important detail missing. What cooler are you using?
    Reply to mbilal2
  2. Yeah, sorry. I am using some worldwide-unknown cooler (SielntiumPC Fortis 3 he1425). That's why I posted results for 6600K :) (same grease for both CPU's). Good comparison to current situation.
    Reply to Mustella
  3. Mustella said:
    Hello

    Today I've bought 7700K as a little upgrade from 6600K. I'm still new to overclocking, however I was curious how good or bad this particular chips was. Motherboard is Asus Sabertooth Z170 S, air cooled. I might put too small amount of thermal grease (Thermal Grizzly Cryonaut, it's very dense...).
    In UEFI I set 1.25 V and it resulted with rather high temperatures (~87 C), and I was like "&*% this ^#&* I'm going to give you back to the shop tomorrow" (I am used to 1.35 V in UEFI for Skylake and that is what I was expecting). However, it turned out that I can multiply freq by 49x100 MHz so I'm peaceful now. (stable after 1h in OCCT)
    However I am a little concerned why are those temperatures that high? It of course might be my fault but as I've checked most people reach above 1.3 V without thermal problems.
    What I'm more concerned about - are values I'm typing in bios real? Both UEFI and OCCT state that VCore is 1.25 (via built-in HW Monitor), however CPU-Z and HWMonitor itself display unstable VID as something above 1,31 V.
    Seeing 4.9 GHz at 1.25 V seems a little unreal for me. For 1.31 V it is more possible. (according to my knowledge which I've gained from last 1 hour of googling).
    And last thing: 6600K run in the same set at 1.35 V at 4.6 GHz and it had never went beyond 80 C.
    PS: Why the heck VIN0 has a value of 60 kV??? :D

    Thanks for all suggestions!


    You have a lot to learn about overclocking but just the fact you are curious and taking the steps you have, show that you are curious enough to succeed.

    Overclocking your CPU is a step by step process but first you need to understand there are various ways to go about the overclock and not everyone overclocks the same, meaning:

    Some use the motherboards auto overclocking feature for simple convenience.

    Some BIOS overclock but keep reins on the CPU, like keeping speed step enabled and all the C states.

    Some manually BIOS overclock for the highest stable CPU overclock they can run, note the word stable.

    No matter what type of overclocker you decide to be your CPU cooling is the most major factor in how far you will get.

    My 7700K 100% stable is overclocked to 5.2ghz with Hyper Threading enabled at 1.405v, HT disabled at 1.380v. (But I am running the cooling to allow that.)
    Reply to 4Ryan6
  4. True. I am not touching any other options than multiplier and VCore. But I still think that cooler is decent. It kept oc'ed 6600k at low temperatures (70-80 deg C). But it can't do much about current CPU. Maybe it's because of CPU's goo.
    Reply to Mustella
  5. Mustella said:
    True. I am not touching any other options than multiplier and VCore. But I still think that cooler is decent. It kept oc'ed 6600k at low temperatures (70-80 deg C). But it can't do much about current CPU. Maybe it's because of CPU's goo.


    Have you pulled the cooler and taken a look at the thermal footprint it is making on the CPUs heat spreader?

    A direct touch heat pipe air cooler like that really needs some thermal compound forced into the spaces between the tubes and leveled out on the heat sink base before mounting it on the CPU.

    The die of the 7700K is running perpendicular to the clamping wings on the heat spreader, I always run a thin line of TIM directly over the CPU die location and then mount the cooler.

    I would pull the cooler and inspect the thermal footprint so you know for sure whats going on underneath it, if you can even reach 4.9ghz with the 7700K with an air cooler, you have a good one.
    Reply to 4Ryan6
  6. If by "thermal footprint" you mean the coverage of IHS (and heat sink) surface by thermal grease, I assume you it is covered in 100% (I always spread the compound on whole IHS). Initially, I thought that layer is too thin, so I'd disassembled the whole thing and added some grease but it had no effect.
    I have bought this cooler in special edition and it looks like this: https://www.google.pl/url?sa=i&rct=j&q=&esrc=s&source=images&cd=&ved=0ahUKEwiDqoejzuPVAhXDK5oKHWSaCn0QjBwIBA&url=http%3A%2F%2Fwww.guru3d.com%2Findex.php%3Fct%3Dnews%26action%3Dfile%26id%3D13594&psig=AFQjCNFctvF94mkGdcyttm6Krd82A1us0g&ust=1503242884375069
    But still, the heat sink surface looks totally covered with grease, without any gaps.
    Reply to Mustella
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