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i7 8700K, 8600K, 7700K Overclock results

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#1
Looking to share results & knowledge. I'm missing an active thread on this. Anything Coffee Lake and Kaby Lake goes!

i7 8700k + AsRock Fatal1ty K6 + beQuiet Dark Rock Pro 3:
Current setup: 5.0 Ghz 4-core boost, 4.9 Ghz 6-core boost, HT OFF, AVX Offset 2. 1.36v - 1.344v vCore, sustained load looks very decent (on air, no delid):
Might be able to push 5.0 6-core still with this setting, but gonna see how this fares over time.

https://www.3dmark.com/3dm/24658425?

OC-4.7-5.0.png
 
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#2
crickets chirping...

I'd join in but my 7800X is a Skylake. :p
 
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#3
crickets chirping...

I'd join in but my 7800X is a Skylake. :p
Indeed, lol :) But feel free, I can always use info on how to tweak the finer details.
 
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#4
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#5
In addition, Overclock.net usually has a Overclocking Guide and Statistics thread for very new generation and keeps a database of results and statistics. Here's Kaby Lake (7600k / 7700k) link and statistics summary below. Stats kept include:

CPU, Bclk, Core Mult, Core Freq, Cache Freq, Vcore in Bios, Vcore, Fclk, Cooler, Stability, Batch, Ram Settings, VCCIO, SA, Motherboard

http://www.overclock.net/t/1621347/kaby-lake-overclocking-guide-with-statistics

Sample Size 61
Average OC 5.03
Median OC 5.00
Average Vcore 1.36
Median Vcore 1.36

From what I have seen so far Coffee Lake is not showing much variation on results
 
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#6
Here's a post I did over in [H] for my stable 5.0, all cores on an asus board, not delidded:

https://hardforum.com/threads/my-87...is-it-pretty-average.1951296/#post-1043420173

XMP for DDR3200 2 x 16GB, selected "No" on doing ALL adjustments, just loaded the profile.
AVX Negative offset 2 (Though I could likely raise this, or seemingly remove it back to 0)
Sync All Cores
50
LLC 5 (I am waffling between 5 and 6. At 5 with 1.31, I drop to 1.296 under load which runs fine. Then at 6 with 1.30, I move up to 1.32 under load, so a little bit of an over shoot with some small heat increase. If 5 proves unstable, I will drop vcore to 1.30 and use 6 since that was 6 hours OCCT with AVX stable).
Long Duration PPL - 4095
Short Duration PPL - 4095
IA AC Load Line - 0.01 (These are what I needed to tame my 1.5 overshoot when booting into desktop)
IA DC Load Line - 0.01 (These are what I needed to tame my 1.5 overshoot when booting into desktop)
CPU Core/Cache Current Limit - 255.50
Core voltage - Adaptive
Eventual Turbo Voltage - 1.31 with LLC 5 (1.30 with LLC 6)
 
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#7
Thanks for that info! Currently settled for 4.8 Ghz @ 1.344v, HT on which is stable in P95
In addition, Overclock.net usually has a Overclocking Guide and Statistics thread for very new generation and keeps a database of results and statistics. Here's Kaby Lake (7600k / 7700k) link and statistics summary below. Stats kept include:

CPU, Bclk, Core Mult, Core Freq, Cache Freq, Vcore in Bios, Vcore, Fclk, Cooler, Stability, Batch, Ram Settings, VCCIO, SA, Motherboard

http://www.overclock.net/t/1621347/kaby-lake-overclocking-guide-with-statistics

Sample Size 61
Average OC 5.03
Median OC 5.00
Average Vcore 1.36
Median Vcore 1.36

From what I have seen so far Coffee Lake is not showing much variation on results
Nice. The 1.36v really seems a tipping point, both in temps and clock rate options.

I'm now Linpack/AVX stable at 4.8 Ghz (6c) / 4.9 Ghz (4c) @ 1.36v, HT ON and no AVX offset. 4.9 on all cores is just out of reach, so I think I've found a nice 24/7 cap. Temps cap out at 90 C under sustained AVX stress testing, and 72-76c with other 100% loads. In normal use... down to 65-70 tops. For a non-delid on air... pretty happy with this result, going to roll with it until it crashes - if it ever does :)

I could still fine tune it further, but that's on the table still if I ever hit instability. 5.0 Ghz unfortunately didn't happen (I can't really add vCore), at least not with HT on, and 6 threads vs +100mhz is an easy choice.

Here's a post I did over in [H] for my stable 5.0, all cores on an asus board, not delidded:

https://hardforum.com/threads/my-87...is-it-pretty-average.1951296/#post-1043420173

AVX Negative offset 2 (Though I could likely raise this, or seemingly remove it back to 0)
Have you watched your actual clock rate with AVX Offset? On my board, it keeps fluctuating clocks between offset/normal values regardless of the type of load. So for me it was effectively a lower clock. I read that happens for most people.

Anyway - pretty nice result there, you've definitely got a better chip there.
 
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#8
I haven't been running overclocked 24/7 because I don't have the need but I will run some tests and show you my load voltages and temps at different frequencies for my i5 8600K Z370 Taichi Gskill TridentZ DDR4 3200 C14. To isolate the CPU, ram is set to JEDEC 2133 1.2V. Z370 Taichi Bios is version P1.40 with Microcode Rev 80. Case is PC A05. Heatsink is a PHTC12-DX with a Yate Loon D14BH-12 strapped on and a Delta EFB1212VH behind it with custom fan curves.

1)
Stock Frequencies, voltages and Temps with Prime95 v29.4 build7 Blend Load for 10 mins:
CPU Frequency: 4.137MHz
NB Frequency: 4036 MHz
CPU Vcore: 1.072 - 1.120
CPU VID: 1.264
Typical Core Temperature 42-60*C
Room Temperature 23*C
I cleared HW Monitor immediately after starting Prime95.
CPU stock.jpg CPUIDStock.jpg
2) Same settings as above except the following:
Multiplier 45X
LLC2
Vcore Offset: Auto
C States Disabled
Rest is stock
CPU Frequency: 4.539MHz
NB Frequency: 4136 MHz
CPU Vcore: 1.168 - 1.184
Typical Core Temperature Ranging 46-72*C, typically around 60*C.
Room Temperature 23*C
45x hwmon.jpg 45x cpuid.jpg


3) seems that after bios 1.40 I don't overclock at as low a voltage as before, that was the Coffeelake Microcode update. I will try different voltages to see where I am at 50X.
More to come...
 
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#9
Own Experience and thoughts


Last time i used it was on my 2600 and that is a long time ago

Runing 5.0GHz with AVX Negative offset 2 = 4.8GHZ = at this point better to run 4.8GHZ

Never used it before except for Xeon Machines


Long Duration PPL - 4095
Short Duration PPL - 4095
No needed

IA AC Load Line - 0.01
IA DC Load Line - 0.01
No needed

CPU Core/Cache Current Limit - 255.50
No needed


Now, my point and question is:

What is the difference between your Machine with all these settings and mine with just Multiplier x 51 and 1.328V?

I don't use none of those settings that you use and my OC is stable.[/QUOTE]
 
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#10
Now, my point and question is:

What is the difference between your Machine with all these settings and mine with just Multiplier x 51 and 1.328V?

I don't use none of those settings that you use and my OC is stable.
It is possible your motherboard's auto for all these categories is good enough for stability. To dial in stability sometimes you have to tweak everything. Some people like to tweak everything on principle.
 
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#11
It is possible your motherboard's auto for all these categories is good enough for stability.
Last time i tweaked an OC'ed Machine was for my i7 2600 since then i use just multiplier and Vcore, is it maybe because i always buy high end Motherboards? i don't think so because the board that @Cybrnook2002 has it is not much different from mine.
 
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#12
Own Experience and thoughts




Last time i used it was on my 2600 and that is a long time ago



Runing 5.0GHz with AVX Negative offset 2 = 4.8GHZ = at this point better to run 4.8GHZ



Never used it before except for Xeon Machines




No needed



No needed



No needed


Now, my point and question is:

What is the difference between your Machine with all these settings and mine with just Multiplier x 51 and 1.328V?

I don't use none of those settings that you use and my OC is stable.
It's the assigned VID (set by Intel) to the CPU that's the difference. Yours is lower, theirs is higher. Mine's higher, though actual voltage I need is much much lower.
 
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#13
It's the assigned VID (set by Intel) to the CPU that's the difference. Yours is lower, theirs is higher. Mine's higher, though actual voltage I need is much much lower.
Fair enough

What voltages are you using?
 
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#14
Cool! It would be awesome if a table was maintained in the first post. Cpu/speed/voltage/cooling/board/ram/speed etc...

Otherwise it will turn into a monster thread with random results. :)
 

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#15
Bios settings: In Windows, under load vcore is at 1.232v @ 4.8Ghz.
180117160716.jpg 180117160754.jpg 180117160812.jpg 180117160851.jpg 180117160859.jpg
 
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#16
8700k.jpg

CPU (no delid)
4800 MHz (HT ON)
CPU Voltage = 1.25V
AVX offset = 2
Vcore LLC = High

Memory (2x Ballistix Sport LT Gray 8GB DDR4-2400 UDIMM BLS8G4D240FSB)
3000MHz 16-18-18-38 1T
Mem V = 1.28V
VCCIO = 1V
VCCSA = 1.1V

Cooling: Thermalright Macho + 12cm fan 1500 rpm
Case: Chieftec Cube

Stability: REALBENCH 24h + Prime95 12h + OCCT Linpack 4h
 
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#17
Seems like updating my Taichi bios to 1.40 from 1.30 has brought back the extreme v-droop issue it had with the original 1.10 bios. I don't want to revert to 1.30 because I got the microcode update from 1.40, unless the microcode 80 update is retained on reloading the 1.30 bios...

Either way, previously was pushing 50x with avx offset 1 and about 1.260v and passed aida64 for 20 mins small fpu, now it can post but droops down to 1.240 which is too low even at higher LLC and therefore unstable.
 
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#18
Own Experience and thoughts




Last time i used it was on my 2600 and that is a long time ago



Runing 5.0GHz with AVX Negative offset 2 = 4.8GHZ = at this point better to run 4.8GHZ



Never used it before except for Xeon Machines




No needed



No needed



No needed


Now, my point and question is:

What is the difference between your Machine with all these settings and mine with just Multiplier x 51 and 1.328V?

I don't use none of those settings that you use and my OC is stable.
Agree with most of these points on my experience thus far - especially the AVX offset. I tried it, and it practically means your CPU drops multipliers on heavy loads. End

So far I'm loving this CPU; except for the one detail of the odd 85-90 C temp spike. They are extremely rare in normal use, in stress tests they occur once every 2-3 mins.

As for LLC, I found on my board which is very similar to @Vario 's Taichi (if not a copy) Level 5 (lowest setting) works best, and using the offset value for vCore is definitely more stable than fixed. I see zero vDroop here, any other level increases temps and gives massive drop at the beginning of a load + higher temp/voltage spikes (have seen 1.41v on level 3, 1.38v on level 4 at same vCore setting) Do note: I did update BIOS to latest, and so far it's been free of issues, things do what they should.
 
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#19
except for the one detail of the odd 85-90 C temp spike.
Is the mobo applying too much auto voltage to your VCCSA/IO?
 
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#20
Is the mobo applying too much auto voltage to your VCCSA/IO?
Possibly, I haven't detected a spike on monitoring that, but it is on auto.

@erocker what would be a good vccsa/io for 3200mhz/C16 sticks?
 

erocker

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#21
hwbot or aida 64 should tell you what it's running at.
 
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#22
@erocker what would be a good vccsa/io for 3200mhz/C16 sticks?
stock? Shouldnt need to add any for 3200mhz. Maybe .1V over stock? Set it manually at stock and see what happens.

Maybe if you have 32gb... but your specs do not say. ;)
 
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#23
stock? Shouldnt need to add any for 3200mhz. Maybe .1V over stock? Set it manually at stock and see what happens.

Maybe if you have 32gb... but your specs do not say. ;)
Thanks, and they do now ;)

Progress! VCCIO and VCCSA @ 1.1v instead of 1.2 / 1.27 (!) and a huge drop in avg temps, I was also able to lower the offset, now sitting at 1.344-1.328 vCore.

Highest temp spike now is high 80's, and occurs a lot less.

OC-4.8-1.34-1.1-1.1-lv5.jpg
 
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#24
Bios settings: In Windows, under load vcore is at 1.232v @ 4.8Ghz.
Yeap, those are the same Voltages i have underload when using 4.8ghz and in Bios Vcore is set at 1.20V
 
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#25
Thanks, and they do now ;)

Progress! VCCIO and VCCSA @ 1.1v instead of 1.2 / 1.27 (!) and a huge drop in avg temps, I was also able to lower the offset, now sitting at 1.344-1.328 vCore.

Highest temp spike now is high 80's, and occurs a lot less.

View attachment 96107
What I found (and noted, to those asking):

IA AC Load Line - 0.01 (These are what I needed to tame my 1.5 overshoot when booting into desktop)
IA DC Load Line - 0.01 (These are what I needed to tame my 1.5 overshoot when booting into desktop)

Was that my board had a LLC on the AC and DC IA lines, and with it set to "Auto" was overshooting (temp spikes). Setting the LLC of those to the lowest I could .1 (and is a common trick for Z170 and Z270) brought temp spikes (and voltage spikes) to basically nonexistent. I also float between LLC 5 and 6 :) Maybe your board has a compatible setting.