Question MSI MEG Z390 ACE and i7-8086K OC

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WebMaximus

Junior Member
Feb 5, 2019
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I just built a new system based on the MSI MEG Z390 ACE motherboard, an i7-8086K and 4x8 GB Corsair 3200MHz DDR4 RGB memory with the goal to find the highest possible but yet stable and safe 24/7 OC.

The CPU has been delidded and the thermal paste replaced by liquid metal. I'm using a Corsair H115i RGB Platinum for cooling in a Corsair 500D RGB SE case with 3 120mm fans as intake in the front and one 120mm fan in the back as exhaust. The H115i's 140mm fans is in a push config.

At this point I've been able to reach what so far seems to be a stable OC of 5.1 GHz with the below changes done in BIOS. The highest temp after stress-testing the CPU is about 75 C.

CPU Ratio: 51
CPU Ratio Mode: Fixed
XMP: Enabled
CPU LLC: Mode 2
CPU Core Voltage Mode: Override
CPU Core Voltage: 1.300
Intel Virtualization Tech: Disabled
Intel C-State: Disabled
Intel Speed Shift Technology: Disabled

I have tried going for 5.2 GHz but so far with no luck. Mostly, it will BSOD during Windows startup. Have been able to get into Windows a couple of times but no stability when stress-testing.

The highest voltage I've tried to make it stable at this point is 1.375. I know most people agree it's fine all the way up to 1.4 but since my goal isn't to receive a single top score running a benchmark but rather find the highest but still stable and safe 24/7 OC as mentioned above, I rather not go too crazy with the voltage.

So my question to you guys is if I missed some important setting that would likely allow me to get a higher OC?

Many thanks in advance for any tips and input!
 
ehume

ehume

Golden Member
Nov 6, 2009
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I have not heard of an i7 8086k. Do you mean an i7 8700K?

Whatever, you have obviously overclocked too high for your Vcore. Scale it back to 4GHz and measure your temps -- the heatsink/AIO you choose makes a difference.
 
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WebMaximus

Junior Member
Feb 5, 2019
6
1
16
This is the CPU I'm using and not sure why I would scale back to 4 GHz when I already have good temps and a stable OC @ 5.1 GHz?

And of course the heatsink and AIO or whatever cooling solution you're using makes a difference. As mentioned in my post above I'm using a Corsair Hydro H115i RGB Platinum. The CPU has been delidded which dropped the temps some 20 C (saw 90+ C before where I now see 70-75 C) in the same scenario.

I'm using Thermal Grizzly Conductonaut between the die and the IHS and Thermal Grizzly Kryonaut between the IHS and the H115i heatsink.
 
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WebMaximus

Junior Member
Feb 5, 2019
6
1
16
ehume

ehume

Golden Member
Nov 6, 2009
1,511
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My mistake. I thought you were starting at 5.2GHz. Since my own 8700k required 1.37v to get to 5GHz, I do not think 1.375v to reach 5.1 is bad. You might try nudging up the LLC a little bit, but I would take your stable OC and be grateful.
 
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WebMaximus

Junior Member
Feb 5, 2019
6
1
16
As mentioned in my initial post, I'm stable at 5.1 at 1.3.

So I'm very pleased and guess I could serve as a living example then comparing to your numbers the difference isn't that insignificant.
 
UsandThem

UsandThem

Elite Member
May 4, 2000
16,068
7,383
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WebMaximus said:
As mentioned in my initial post, I'm stable at 5.1 at 1.3.

So I'm very pleased and guess I could serve as a living example then comparing to your numbers the difference isn't that insignificant.
Click to expand...

Hey, it's your PC so do with it as you will, and enjoy. I was simply responding to another user who wasn't aware of the sku, and not to your decision to buy it.
 
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WebMaximus

Junior Member
Feb 5, 2019
6
1
16
UsandThem said:
I didn't mistype what I wrote.

https://techreport.com/review/33786/intel-core-i7-8086k-cpu-reviewed

View attachment 3052

Anandtech's take: "Save your money".
Click to expand...

The numbers in the link came from SL which I would like to think has went through a fair number of CPUs.

So personally I would say those numbers are quite well-founded and again, since I'm stable with very little work at 5.1 at 1.3...that to me at least prove that.

Oh well, didn't come here to debate my CPU. Rather to make sure I didn't miss some important setting that could allow me to go higher.
 
Markfw

Markfw

Moderator Emeritus, Elite Member
May 16, 2002
27,131
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WebMaximus said:
The numbers in the link came from SL which I would like to think has went through a fair number of CPUs.

So personally I would say those numbers are quite well-founded and again, since I'm stable with very little work at 5.1 at 1.3...that to me at least prove that.

Oh well, didn't come here to debate my CPU. Rather to make sure I didn't miss some important setting that could allow me to go higher.
Click to expand...
I think what he is trying to say is "only 14% can get to 5.3 ghz" so if you have 5.1, you should be happy. 5.2 might be doable at a lot of vcore. 5.3 would be very lucky.

"not an expert at Intel overclocking"
 
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UsandThem

UsandThem

Elite Member
May 4, 2000
16,068
7,383
146
Markfw said:
I think what he is trying to say is "only 14% can get to 5.3 ghz" so if you have 5.1, you should be happy. 5.2 might be doable at a lot of vcore. 5.3 would be very lucky.

"not an expert at Intel overclocking"
Click to expand...

Yeah, pushing it to it's very limits wouldn't be something I'd run 24/7.
 
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WebMaximus

Junior Member
Feb 5, 2019
6
1
16
Markfw said:
I think what he is trying to say is "only 14% can get to 5.3 ghz" so if you have 5.1, you should be happy. 5.2 might be doable at a lot of vcore. 5.3 would be very lucky.

"not an expert at Intel overclocking"
Click to expand...

I'm sure you're right and I certainly am happy with my current OC of 5.1.

Reaching 5.3 isn't something I was thinking would be possible unless I was lucky enough to get an extreme golden chip.

5.2 though which according to SL is possible with 60% of the 8086Ks was a frequency I thought I might be able to reach.

However, considering the difference between 5.1 and 5.2 outside benchmarking, I think I'll just stay where I am and enjoy my new build instead using it for what I built it for in the first place - VR flying in X-Plane :)

UsandThem said:
Yeah, pushing it to it's very limits wouldn't be something I'd run 24/7.
Click to expand...

If those limits are related to voltage or temperature, I fully agree.
 
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