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Overclock I7 6700K Problem

 
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post #1 of 4 (permalink) Old 07-29-2020, 08:40 AM - Thread Starter
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Overclock I7 6700K Problem

I tried to overclock a liquid-cooled I7 6700K on an MSI Z170A Krait gaming X3, updated to the latest bios, making these attempts in the settings:

OC Explore Mode: expert mode
CPU Ratio Apply Mode: all core
CPU Ratio: 46
CPU Ratio mode: Dynamic Mode / Fixed Mode
Ring Ratio: Auto
EIST: Enabled / Disabled
Intel Turbo Boost: Enabled / Disabled
CPU Core Voltage: 1.35v / 1.40v
I also tried disabling these features: Intel Adaptive Thermal Monitor and Intel C-State

I tried with Linx, prime 95 and IBT and with all the behavior is always the same: after a couple of minutes the multiplier goes down to 44 and the frequency to 4400MHz, continuing the test at this fixed frequency.
Temperatures are always good.

Do you know if it is normal or is there something that causes this abnormal behavior?

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post #2 of 4 (permalink) Old 07-29-2020, 08:42 AM
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CPU temperature = ?
VRM temperature = ?

Intel i9 9900K Coffee Lake @ X8 5309mhz (+47.5%)
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Intel i7 6700 Skylake @ X4 4709mhz (+38.5%)
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post #3 of 4 (permalink) Old 07-29-2020, 09:38 AM
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Quote: Originally Posted by The Pook View Post
CPU temperature = ?
VRM temperature = ?

^^yeah, need a bit more information re. temps and may be mobo settings for package power limits (watts, seconds) would help. By coincidence, I'm in the process of rebuilding my 6700K this week (8 yr-old AIO needed 'an operation'). Below is the 6700K @ 4.7 to test AIO under sustained load, then I'll go back to the 4.8 setting also shown.

When you set your system up, try to keep temps under 80 C, give package power limits enough room and see what max oc you can sustain.
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post #4 of 4 (permalink) Old 08-07-2020, 03:17 AM - Thread Starter
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I have set all the limits to the maximum, from the "cpu Futures" section and now it is more stable, but anyway at a certain point I have continuous drops in the multiplier (the frequency does not go down to 4200 fixed, but goes up and down continuously).
I have been monitoring with hwinfo and am getting these warnings in conjunction with frequency drops: IA: VR Thermal Alert and RING: VR Thermal Alert on Yes.
CPU Temp 80°.

I guess it's the temperature of the motherboard vrm or something integrated into the processor.

So I have some questions about it:

1) what is it exactly? (is this the cause?)

2) Besides lowering the vcore and trying to place a fan on the motherboard heatsinks on the VRMs, is there any other setting I can try in the bios settings (like lowering some other frequency or voltage besides the vcore)?


(The case is a big tower with two 140 inlet fans, one 120 in extraction on the back and 3 120 in extraction on the radiator on the top of the case.)

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