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Cooling system for i7-8086k (i7-8700k) @ 5.1-5.3 GHZ

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Processor i7-8086k
Motherboard ASUS ROG MAXIMUS X CODE
Cooling EVGA 240 WATERCOOLER
Memory G.SKILL DDR4 3200MHZ CL14
Video Card(s) EVGA GeForece 1070ti SC Hybrid
Storage WD Black M.2 NVMe 4x 500gb
Power Supply Dell 1100w (T7500)
Benchmark Scores https://valid.x86.fr/uwqpn1
#1
So I'm not new to overclocking but have been out of the game for about a decade and a lot has changed..namely cooling. I jumped back in trying to squeeze more performance out of my T5500/T7500s as I'm bottlenecking my GPU and Ive been bitten by the OC bug again.

Have:
EVGA 1080ti SC Hybrid

Inbound:
ASUS Maximus X Code
i7-8086k (aka binned i7-8700k)
G.skill 15CLI 3000mhz ram (4x4gb)
WD Black M.2 500gb NVMe

Ive read these chips all hit 5.1ghz across all 6 cores easily. I'm not looking to go crazy but a lot has changed in cooling since I did this last, so should I go air or water for the CPU cooling. Sound is not an issue I sit next to a bunch of ASICs. I already have a corsaire vengence or defender ram fan cooler I will use and the 1080ti is watercooled. I'm leaning towards the EVGA 240 watercooler to kind of match the GPU, but I'm open to options.

I dont want to go crazy, this will be a daily use but I do want the most I can get reliably (without the hassle of immersion or phase change),

Any thoughts?
 
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#2
- 5 Ghz is a realistic target. 5.1 is pushing the lottery
- The ideal performance RAM is 3200 CL14. Worth considering within your return period - when you do, make it 2x8Gb as well, so you push the memory controller less hard, because it will limit OC headroom
- You can air cool this. Im doing it for an 8700K, check specs. If you want to push higher than 1.35v, you will want to consider water, 240 rad seems good.
 

Knoxx29

The Power Of Intel
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#3
First of all Welcome to TPU @totalfreq

Ive read these chips all hit 5.1ghz across all 6 cores easily
That is right, most 8086K hit as you already said 5.1GHz easily even 5.2GHz/5.3GHz it is not that hard ( Impossible ) to hit, about the Cooling solution my advice would be useless considering that when someone else join the thread they could tell you the opposite of what i would say, that said let's wait for the others.
 
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#4
I'm leaning towards the EVGA 240 watercooler to kind of match the GPU, but I'm option to options.
240 is pushing it - if your happy with 5ghz, you'll want to make sure you delid that 8086k to handle thermals if your aiming above that go for a 280mm aio or a 360mm one.
 

Knoxx29

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#5
240 is pushing it - if your happy with 5ghz
I am using a 240 Rad 5.3GHz 1.36V and not Delidded.

Note: Delidding is the last option if your CPU is a hot one and don't overclock at high clock speed without adding high Voltages.
 
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Processor i7-8086k
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Video Card(s) EVGA GeForece 1070ti SC Hybrid
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#6
- The ideal performance RAM is 3200 CL14. Worth considering within your return period - when you do, make it 2x8Gb as well, so you push the memory controller less hard, because it will limit OC headroom
I agree on the CL14, but I wanted quadrank which limited my options vs $$$. I havnt worked with this board before so any realworld experience is always appreciated, but I usually find controller overhead is minimal compared to properly matched ranks. Now if I was going to mix two dual rank sets...then I definately would agree performance would be hindered in exchange for capacity. With the Maximus X Code using the T Topology supporting QR, I imagine I will pick up the extra buswidth without a hugh impact to the controller, but if you have a Code/Formula and have different experience with QR vs DR I'm all ears.

So you convinced me to experiment...i ordered a pair of cl14 3200mhz. Cant argue the math on the latentcy/freq so ill test with both the QR and DR setups when they come in and report back.
 
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#7
I am using a 240 Rad 5.3GHz 1.36V and not Delidded.
And how are temps? Any thermal throttling? You've clearly won the TIM lottery and the silicone lottery there.
 

Knoxx29

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#8
And how are temps? Any thermal throttling? You've clearly won the TIM lottery and the silicone lottery there.
If you haven't seen me here opening a Thread where i am asking for help because my CPU temps are high that means that everything is working fine;) and the people in here that knows me they know how much i care about Temps.

Note: one thing that helps a lot to keep my temps not that high is the amount of Water in the Loop ( 7 liters )
 
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#9
It would depend on whether or not your CPU is cooler or hotter when it runs. Some people complain that these chips are very warm even @ stock frequencies, my experience is totally opposite of that, I was able to cool mine with a stock 1150 Intel CPU cooler for a couple days while I waited to install my water cooler. my 8600K running @ 5.2 to 5.3 GHz never even broke 70°C , but yours may be hotter. you shouldnt need anything ridiculous tho, even if it is a warmer Chip. Id guess anything equal to a H-75 & above would be fine, or a 212EVO (if its the one im thinking of)
 

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Processor i7-8086k
Motherboard ASUS ROG MAXIMUS X CODE
Cooling EVGA 240 WATERCOOLER
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Video Card(s) EVGA GeForece 1070ti SC Hybrid
Storage WD Black M.2 NVMe 4x 500gb
Power Supply Dell 1100w (T7500)
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#11
If you haven't seen me here opening a Thread where i am asking for help because my CPU temps are high that means that everything is working fine;) and the people in here that knows me they know how much i care about Temps.

Note: one thing that helps a lot to keep my temps not that high is the amount of Water in the Loop ( 7 liters )
What target temps should I be looking at OC'd for this chip (Idle/max)?

Im running limited testing under stress around 81c max at 5.296ghz @ 1.376v.

Also I went with the 240mm cooler (due to space constraints) and swapped out the ram for the suggest cl14.
 
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Knoxx29

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#12
What target temps should I be looking at OC'd for this chip (Idle/max)?

Im running limited testing under stress around 81c max at 5.296ghz. I will be running an extended stress test tomorrow but I didnt want to push it without knowing a decent target temp to watch for.
81c for 5.296GHz and that Cooler it is not bad at all considering that is while under stress, that makes me believe your temps when Gaming should be around 60c or something like that? however the TJUNCTION for that CPU is 100c, that said, you dont have anything to worry about


With that Clock speed and voltage 81c is nothing, seems like a good CPU and you still have enough room to push it a bit further
 
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#13
So I'm not new to overclocking but have been out of the game for about a decade and a lot has changed..namely cooling. I jumped back in trying to squeeze more performance out of my T5500/T7500s as I'm bottlenecking my GPU and Ive been bitten by the OC bug again.

Have:
EVGA 1080ti SC Hybrid

Inbound:
ASUS Maximus X Code
i7-8086k (aka binned i7-8700k)
G.skill 15CLI 3000mhz ram (4x4gb)
WD Black M.2 500gb NVMe

Ive read these chips all hit 5.1ghz across all 6 cores easily. I'm not looking to go crazy but a lot has changed in cooling since I did this last, so should I go air or water for the CPU cooling. Sound is not an issue I sit next to a bunch of ASICs. I already have a corsaire vengence or defender ram fan cooler I will use and the 1080ti is watercooled. I'm leaning towards the EVGA 240 watercooler to kind of match the GPU, but I'm open to options.

I dont want to go crazy, this will be a daily use but I do want the most I can get reliably (without the hassle of immersion or phase change),

Any thoughts?

I rebuilt my daughter's system last year with an 8700k and I got the Maximus X Apex board because I like to tinker around and overclock when she's not home. At first I put the setup in my primary PC which has a 360mm HWLabs GTX 360/EK Supremacy EVO loop and I was able to clock the 8700k to 5.0ghz, no AVX offsets, LLC5, at 1.29v but the temps would hit 94c while running these newer versions Prime 95. If I delidded this chip, it would have no trouble at 5.2ghz AVX-2 offset.
After some tweaking it can do 5.1ghz, AVX -2 offset with reasonable temps. Once I put the z370 setup in her PC I ended up with the EVGA 280clc but I have scaled it back to 5.0ghz AVX offset -2 which put the temps in the low 80's. At 5.1ghz AVX offset -2 the temps are in the 90's with the 280clc while running a stress test.

According to Silicon Lottery I somewhat fail to see how these 8086k processors were much better than a 8700k except it seems the worst ones can do 5.1ghz AVX -2 offset.

I have the Rockit 88 delidding tool but I have only delidded a 3770k, 6700k, and 7700k so far. I never got to my 4790k before I sold it and I haven't done the 8700k yet. With the 6700k I slashed around 30c off the overclocked temps, but with the 7700k it only slashed a little more that 20c off the temps when overclocked. The 3770k fared even worse with a 15c cut. So it greatly depends on how much room there is between the IHS and Silicon die.

Since all chips are different, you stand a chance of of 5.1ghz as long as you cut the AVX offset to -2. If you have a well made chips that has minimal distance between the IHS and CPU, and the Silicon is good then I don't see a problem.
 
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#14
Id suggest a H320X (3 x 120mm) 0r H240X (2 x 120mm) so that at some point you can lose the Hybrid water cooler and join the loops together

https://www.techpowerup.com/reviews/Swiftech/Swiftech_H360X3_Drive_X3_AIO/

Can not recommend any CLC type coolers with aluminum rads ....eventually, they all look like the pics here... good reading BTW

https://martinsliquidlab.wordpress.com/2012/01/24/corrosion-explored/

As for temps, that question can't be answered without knowing whet you are stress testing with and whether that utility has any applicability to real word usage. No synthetic tests will do that; passing a synthetic tests means a) your CPU is stable running the same thing on all cores. no indication about multitasking stability b) your CPU is likely 10C or more hotter than it would ever be throwing any combination of real world apps at it. So if your core voltage is set at 1.35, you might see 87C and stable in a synthetic test at 5.1 Ghz ..... and 75C / unstable in an application based multitasking test. If 87 makes you uncomfy as it would me, you may be stuck at that 5.1 GHz. But at 1.38, you just might be application based torture test stable at 5.3 GHz and 79C .... Id be happy with that

I test with these

http://dlcdnmkt.asus.com/rog/RealBench_v2.56.zip
https://www.hwinfo.com/

Give this a run thru

https://www.tweaktown.com/guides/8481/coffee-lake-overclocking-guide/index.html
 
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#15
Full custom loop. I can't recommend anything else now when I'm running with custom loop.
 
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#17
My 8086 was delided before I installed it. I used liquid metal pro. I'm at 1.37 v at 5200 on all cores idle is 29 to 31 max temp aida64 is 84 I couldn't be happier. My board is Asus Maximus Code and my cooler NZXT Kraken x62
 

Knoxx29

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#18
For 5.2GHz my CPU need 1.325V and for 5.3GHz 1.36V ( No Delidded )
 
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#19
It depends on the chip. I've built 8700k systems for friends with 5.1ghz all core at 1.4v, on a delidded chip repasted with conductonaut. Got temps under 80c full load with just a Noctua NH-D15. Fan speed never went above 70% which meant they're quiet as well.

People who say delidding should be a last case measure IMO don't get it. The bottleneck is not how good your cooler is or it's capacity, but how fast the heat can move from the chip to the cooler. It really doesn't matter if you have the best hardline liquid cooling system on the planet if your chip can only transfer heat at a set rate.

Ask yourself this, is it worth the added cost and reliability concerns of watercooling, when you can use high end air as long as you delid?

And those stats (5.1g at 1.4v) are not showing any kind of "golden chip" by any means. Much better results could be achieved with a better chip.
 

Knoxx29

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#20
Ask yourself this, is it worth the added cost and reliability concerns of watercooling, when you can use high end air as long as you delid?
My WaterChiller is way better than any high end air Cooler out there:p


20171121_180446.jpg
 
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#21
My WaterChiller is way better than any high end air Cooler out there:p


View attachment 110395
I swear if I ever get into watercooling, this is going to be a thing. Otherwise what is the bloody point. Need to see low temps or its a total waste of time :D

It depends on the chip. I've built 8700k systems for friends with 5.1ghz all core at 1.4v, on a delidded chip repasted with conductonaut. Got temps under 80c full load with just a Noctua NH-D15. Fan speed never went above 70% which meant they're quiet as well.

People who say delidding should be a last case measure IMO don't get it. The bottleneck is not how good your cooler is or it's capacity, but how fast the heat can move from the chip to the cooler. It really doesn't matter if you have the best hardline liquid cooling system on the planet if your chip can only transfer heat at a set rate.

Ask yourself this, is it worth the added cost and reliability concerns of watercooling, when you can use high end air as long as you delid?

And those stats (5.1g at 1.4v) are not showing any kind of "golden chip" by any means. Much better results could be achieved with a better chip.
Delidding is a last resort measure, or at least, should be, because you kill warranty with it and there is a real risk of doing it wrong which means you can brick a CPU. At the same time, the performance gained from delidding barely exists - the only reason a delid is really going to get you anywhere further is when you want to push for record OC's. The real world gain of a delid in performance is at the very best 200mhz. That is less than 5% on a 5Ghz CPU. Seems a bit weak for the risk, cost and effort involved. Most use cases however barely extract 100mhz, so you end up with performance gaps that are almost margin of error territory.

The actual fact is, YOU don't get it. Look at the recent reviews and even stock temps of the SOLDERED Intel 9th gen. That's right 90 C is not uncommon. The fact is, as transistor density / mm² goes up, so does the concentration of heat. At the same time, Intel's 7th, 8th and 9th gen CPUs have progressively increased the Vcore on stock so they basically are just overclocking CPUs out of the box for you, so headroom shrinks.

Intel's soldered CPUs have definitively proven that their 14nm Core stuff is at peak performance and you run into voltage, thermal and throughput thresholds all at the same time (its why RAM latency and freq also has noticeable effect). Clocking further makes absolutely no sense apart from epeen value. You can count your blessings if you can hit the 1-core turbo across all cores these days.
 
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Knoxx29

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#22
I swear if I ever get into watercooling, this is going to be a thing. Otherwise what is the bloody point. Need to see low temps or its a total waste of time :D

Fair enough

Why haven't you Built one?
 
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#24
Exactly. Practically, as long as the CPU is below 75degrees under sustained load, the fan noise is below a certain DBa, and you've achieved the OC you want, it really doesn't matter what type of cooling you use.
 

Knoxx29

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#25
Exactly. Practically, as long as the CPU is below 75degrees under sustained load, the fan noise is below a certain DBa, and you've achieved the OC you want, it really doesn't matter what type of cooling you use.
Agree with you.


Regular users are happy with 75C and i am happier with 40C
 
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