Z370 / Z390 VRM Discussion Thread

pastorx · Dec 2, 2017

Quote:

Originally Posted by AlphaC

https://www.tweaktown.com/reviews/8460/gigabyte-z370-aorus-gaming-5-motherboard-review/index10.html

Seems Steven's Gaming 5 didn't produce as good a result as the Chinese site's and Gecid

It's hotter than the Pro Carbon from the back of the board

How not to test VRM temp:
https://www.techpowerup.com/reviews/MSI/Z370_GAMING_PRO_CARBON_AC/14.html

3.9 - 4.1 GHz CPU, 3670 MHz Memory
CPU Voltage: 1.105 V
DRAM Voltage: 1.36 V
Idle Power: 4 W
Load Power: 64 W
VRM Temperature: 35.7°C
Chipset Temperature: 33.4°C

Asus Z370 TUF Pro

http://playwares.com/userreview/55875008

Asus TUF Plus

https://ru.gecid.com/mboard/asus_tuf_z370-plus_gaming/
(4.9GHz @ 1.2V in unknown current load - AIDA64 FPU)

For reference, the STRIX-E with 5GHz @ 1.264V

The cooling system consists of three main aluminum radiators: one removes heat from the Intel Z370 chipset, while the other two cover the elements of the processor's power supply subsystem. During the testing, the following temperature indicators were recorded:

the cooling heatsink of the chipset is 32.5 ° C (when overclocked - 33.7 ° C);
the upper cooler for cooling the elements of the processor's power supply subsystem is 44 ° C (when overclocked, 53.5 ° C);
side cooling radiator for the elements of the processor power subsystem - 44.8 ° C (when overclocked - 54.6 ° C);
chokes - 56,6 ° C (when overclocked - 72,7 ° C).

STRIX-F with 5GHz @1.408V ... this is probably the old BIOS with vdroop

The cooling system of the board in question consists of three main aluminum radiators. During the testing, the following temperature indicators were recorded:

radiator cooling chipset - 32.2 ° C (when overclocked - 32.5 ° C);
the upper radiator cooling elements of the power supply system - 41 ° C (when overclocked - 47.1 ° C);
the lower radiator for cooling the elements of the power subsystem is 44.5 ° C (when overclocked - 49.3 ° C);
the chokes of the power subsystem are 52.2 ° C (in the case of overclocking - 62 ° C).

Z370 Gaming 5 result with 5GHz @ 1.236V

The cooling system consists of three main aluminum radiators: one removes heat from the Intel Z370 chipset, while the other two cover the elements of the processor's power supply subsystem. During the testing, the following temperature indicators were recorded:

the cooling heatsink of the chipset is 35.3 ° C (when overclocked - 35.6 ° C);
the upper cooler for cooling the elements of the processor's power supply subsystem is 41.8 ° C (at acceleration - 48.2 ° C);
The lateral radiator for cooling the elements of the processor's power supply subsystem is 40.8 ° C (at overclocking - 46.1 ° C);
chokes - 47,5 ° C (at overclocking - 58,1 ° C).

Z370 Ultra Gaming with 4.9GHz @1.284V

The cooling system consists of three main aluminum radiators: one removes heat from the Intel Z370 chipset, while the other two cover the elements of the processor's power supply subsystem. During the testing, the following temperature indicators were recorded:

radiator cooling chipset - 31.7 ° C (when overclocked - 32.6 ° C);
the upper cooler for cooling the elements of the processor's power supply subsystem is 37.1 ° C (when overclocked - 51.6 ° C);
the lower cooler for cooling the elements of the processor's power supply subsystem is 43.2 ° C (when overclocked, 62.7 ° C);
chokes - 47.5 ° C (when overclocked - 72.5 ° C).

Then who is right? most sites show better temperatures in gaming 5 than in tweaktown
Or is it the same as with gaming 7, that there are some that get hotter because of heatsinks? or just a faulty model as you said earlier?

AlphaC · Dec 2, 2017

One thing that is for sure is the Gaming 5 had consistent results between gecid + the Chinese site vs the STRIX boards. It is unclear if the reviewers measured from the back of the board. Steven (tweaktown) measured from the back and front.

The MSI Pro Carbon has had a BIOS update (dated October 30) since the Chinese review. Techreport noted the poor heatsink design for the left side heatsink (i.e. the main CPU VRM section as seen on https://techreport.com/review/32836/msi-z370-gaming-pro-carbon-ac-motherboard-reviewed).

Patch notes for the MSI BIOS update:
Quote:

- Fix throttling issue when use 8700 cpu to run Prime95 burning test.
- Improve memory compatibility.
- Enhance Game boost function.
- Fix monitor is not able to turn on after resume from S3 mode via lan wake up event.
- Update Intel ME for security vulnerabilities

A possible explanation is the amount of airflow. Gigabyte's RGB heatsink solution is more decorative than functional, even if it does have a heatpipe. The fin area is covered by the RGB. IMHO They probably should have just added the LEDs on the side of the heatsink and stylized the heatsink such that RGB light reflects more prominently.

pastorx · Dec 2, 2017

very true, anyway the results are still positive,

textual words from tweaktown
{The Z370 AORUS Gaming 5's thermal performance is acceptable. There are many VRMs out there with similar configurations; 8 phases doubled by doubling component count on each driver, and they perform mostly the same depending on cooling.}

asdkj1740 · Dec 2, 2017

Quote:

Originally Posted by AlphaC

https://www.tweaktown.com/reviews/8460/gigabyte-z370-aorus-gaming-5-motherboard-review/index10.html

Seems Steven's Gaming 5 didn't produce as good a result as the Chinese site's and Gecid

It's hotter than the Pro Carbon from the back of the board

um...this gaming 5, as i said, has the same vrm design to its lower end mobos.
same cpu controller, same mosfets, same drivers (two external with 2 integrated for the vcore and 2 external with 1 integrated for the igpu).
the differences are that two vcore drivers are located differently compared to ultra gaming/gaming3/hd3p, and there are obviously having more inductors.
i highly doubt the gaming 5 is doubled 8 phases vcore design.

if this gaming 5 can draw much higher power than its lower end mobos, then this means vrm cooling really matters.

also, the bios are certainly different on gaming 5 and its lower end mobos, because the core current limit (amps) settings on the gaming 5 bios are now adjustable, compared to its ultra gmaing(hd3p) f5/f4 bios with greyed out unadjustable 160w (locked) core current limit amps settings.
f6 bios for ultra gaming is out now, i dont know whether this current max settings is now be able to tweak or not.
https://www.tweaktown.com/image.php?image=imagescdn.tweaktown.com/content/8/4/8460_39_gigabyte-z370-aorus-gaming-5-motherboard-review_full.png

asdkj1740 · Dec 2, 2017

MSI Z370I GAMING PRO CARBON AC
https://www.chiphell.com/thread-1801408-1-1.html

8pin connector, 8 inductors for vcore and igpu.
cpu contorller is uP9508Q, total 8 phases are all with QM3816N.

it said there are three up1961s doublers on the back of the pcb. there are two different little ic on the back of the pcb too (seem to be up1962 single phase driver).
therefore it seems to be 3+2 design and doubled to 6+2.

AlphaC · Dec 2, 2017

QM3816N
http://www.ubiq-semi.com/files/1875/e4b0aa1e-92e0-11e7-881a-c4cbaf091d7a

1.9mΩ RDS(on) for low side
very high rise time of 37.7 ns...

high side limit supposedly 32A @100°C T_case

edit: punching the numbers it seems this is roughly on par with a Tomahawk/Krait with the caveat you must cool the VRM extensively. The VRM heatsink is small so that doesn't help. Without accounting for the VRM heatsink I would say you could should only push about 160W through it even if the overall efficiency is higher (due to the low side fet on state resistance) because the high side fet will heat up faster with 6 mosfets used instead of 8.
Quote:

Originally Posted by asdkj1740

um...this gaming 5, as i said, has the same vrm design to its lower end mobos.
same cpu controller, same mosfets, same drivers (two external with 2 integrated for the vcore and 2 external with 1 integrated for the igpu).
the differences are that two vcore drivers are located differently compared to ultra gaming/gaming3/hd3p, and there are obviously having more inductors.
i highly doubt the gaming 5 is doubled 8 phases vcore design.

if this gaming 5 can draw much higher power than its lower end mobos, then this means vrm cooling really matters.

also, the bios are certainly different on gaming 5 and its lower end mobos, because the core current limit (amps) settings on the gaming 5 bios are now adjustable, compared to its ultra gmaing(hd3p) f5/f4 bios with greyed out unadjustable 160w (locked) core current limit amps settings.
f6 bios for ultra gaming is out now, i dont know whether this current max settings is now be able to tweak or not.
https://www.tweaktown.com/image.php?image=imagescdn.tweaktown.com/content/8/4/8460_39_gigabyte-z370-aorus-gaming-5-motherboard-review_full.png

I think at the end of the day the biggest differentiation is the use of one set of mosfets per inductor, more output capacitance, a heatpiped heatsink, and use of the ISL6225 dual driver (shoot through protection)

200A is the rough package limit on the Strix boards (25A x 8 sets of mosfets) when in actuality it's closer to 20A per set (at 70°C), which is ~160A as well.

pastorx · Dec 2, 2017

Quote:

Originally Posted by AlphaC

QM3816N
http://www.ubiq-semi.com/files/1875/e4b0aa1e-92e0-11e7-881a-c4cbaf091d7a

1.9mΩ RDS(on) for low side
very high rise time of 37.7 ns...

high side limit supposedly 32A @100°C T_case

edit: punching the numbers it seems this is roughly on par with a Tomahawk/Krait with the caveat you must cool the VRM extensively. The VRM heatsink is small so that doesn't help. Without accounting for the VRM heatsink I would say you could should only push about 160W through it even if the overall efficiency is higher (due to the low side fet on state resistance) because the high side fet will heat up faster with 6 mosfets used instead of 8.
I think at the end of the day the biggest differentiation is the use of one set of mosfets per inductor, more output capacitance, a heatpiped heatsink, and use of the ISL6225 dual driver (shoot through protection)

200A is the rough package limit on the Strix boards (25A x 8 sets of mosfets) when in actuality it's closer to 20A per set (at 70°C), which is ~160A as well.

Maybe I'm paranoid, sorry im waiting a gigabyte aorus gaming 5 + i7 8700k yet, and all these things confuse me. The most I plan to get is 4.7ghz oc.
Any conclusion about the aorus gaming 5, compared to the Z370-A? how many watts it is capable of? since we know it is superior to the strix E / F. All say that in effect gaming 5 has doubled 8 phases vcore design, I do not understand why the doubt.

_the gaming 5 cost me about 160$,

pastorx · Dec 2, 2017

There are contradictions also in other motherboard reviews for example the taichi, in tweaktown it throws a good temperatures, but in tomshardware it is not like that, although the temperatures improved a bit in future bios updates, but even higher than in Tweaktown review.

Tweaktown>
{ The Z370 Taichi produced excellent VRM temperature results, and that isn't very surprising as the 60A inductors, dual N-channel FETs, and new Intersil PWM work together in harmony. Temperatures on the front were always higher than on the rear of the motherboard, which means that the motherboard is being cooled well. Quality in the VRM section of the motherboard is superb}

Read more: https://www.tweaktown.com/reviews/8381/asrock-z370-taichi-motherboard-review/index10.html

Tomshardware
{Heat problems are the first mark against the Taichi, followed by excessive power consumption and overclocking weaknesses. This combination of factors almost makes it look like the power section was lifted from the Z270 Taichi, which was optimized for four-core rather than six-core CPUs. And while some of these issues might be minimized in future firmware revisions, we're not ready to label this one "fully acceptable" to qualify for our Approved award. And if it can't get over that hurdle, the value-oriented "Recommended" award would require a vaulting pole. We didn't find one in the installation kit.}

Read more: http://www.tomshardware.com/reviews/asrock-z370-taichi-intel-coffee-lake-atx-motherboard,5279-4.html

AlphaC · Dec 2, 2017

Who do you trust more? 8pack, Siliconlottery, and Steven from tweaktown or Tom's hardware? The mosfets used along with the heatsink design has been proven on other platforms.

Also note hardwareluxx user results.

SiliconLottery binning stats for i7-8700k
As of 12/01/17, the top 16% of tested 8700Ks were able to hit 5.2GHz or greater. (AVX Offset 2 ; < 1.425V Vcore)
As of 12/01/17, the top 43% of tested 8700Ks were able to hit 5.1GHz or greater. (AVX offset 2 ; < 1.412V Vcore)
As of 12/01/17, the top 72% of tested 8700Ks were able to hit 5.0GHz or greater. (AVX offset 2 ; < 1.40V Vcore)
As of 12/01/17, the top 99% of tested 8700Ks were able to hit 4.9GHz or greater. (AVX offset 2 ; < 1.387V Vcore)

and for i5-8600k
As of 12/01/17, the top 13% of tested 8600Ks were able to hit 5.3GHz or greater. (AVX offset 2, < 1.437V Vcore)
As of 12/01/17, the top 38% of tested 8600Ks were able to hit 5.2GHz or greater. (AVX offset 2, < 1.425V Vcore)
As of 12/01/17, the top 65% of tested 8600Ks were able to hit 5.1GHz or greater. (AVX offset 2, < 1.412V Vcore)
As of 12/01/17, the top 84% of tested 8600Ks were able to hit 5.0GHz or greater. (AVX offset 2, < 1.40V Vcore)
As of 12/01/17, the top 98% of tested 8600Ks were able to hit 4.9GHz or greater. (AVX offset 2, < 1.387V Vcore)

skyhawk21 · Dec 2, 2017

Gaming 5 will easily overclock 8700k to 4.7ghz and run it cool in ventilated case.

Only issue is vdroop on vcore and rails or a bad sensor that glitches giving the voltage readings... they fluctuate all voltages every second going up and down from what's set in bios even with llc on max.

Quote:

Originally Posted by pastorx

Maybe I'm paranoid, sorry im waiting a gigabyte aorus gaming 5 + i7 8700k yet, and all these things confuse me. The most I plan to get is 4.7ghz oc.
Any conclusion about the aorus gaming 5, compared to the Z370-A? how many watts it is capable of? since we know it is superior to the strix E / F. All say that in effect gaming 5 has doubled 8 phases vcore design, I do not understand why the doubt.

_the gaming 5 cost me about 160$,

Leoplate25 · Dec 2, 2017

Quote:

Originally Posted by AlphaC

Who do you trust more? 8pack, Siliconlottery, and Steven from tweaktown or Tom's hardware? The mosfets used along with the heatsink design has been proven on other platforms.

Also note hardwareluxx user results.

Hi! Then i'm gonna be fine with the Z370 Aorus Gaming 5 and a non-K 8700? I have a Thermaltake Versa H34 and 3 TT Riing 12mm fans, two on top of the motherboard and one in the back of the case. What do you think about it? Which temps will i have? (Aprox.) Thanks and i don't know anything about VRM's, hehe!

24650974_10214924884381010_1301688159_o.jpg 81k .jpg file

AlphaC · Dec 2, 2017

@ Leoplate25 : About 40°C , see the stock load result from Steven's review
https://www.tweaktown.com/reviews/8460/gigabyte-z370-aorus-gaming-5-motherboard-review/index10.html

Without case airflow you'd get higher temps inline with playwares (~70°C in AVX2 Prime95) or the PC DIY Online chinese site (mirrored at http://tech.ifeng.com/a/20171025/44728408_0.shtml ~46°C) , or about 50°C at inductors (the squares with a "P" on them) per gecid (https://ru.gecid.com/mboard/gigabyte_z370_aorus_gaming_5/).

This thread is only particularly relevant to unlocked CPUs with AVX loads. If you are using a locked CPU I would focus more on featureset (real features such as post code LED , audio solution, LAN/wifi, dual BIOs, etc. not aesthetic features). You will find that most likely the best ones without regard for VRM are likely the boards such as Asrock Z370 Extreme4 (~$120-140), MSI Z370 SLI PLUS (~$120-130).

MSI Z370 Pc Pro (Confirmation)
Sinopower SM4337 & SM4503
https://www.hardwareinside.de/msi-z370-pc-pro-mainboard-im-test-29973/6/

Leoplate25 · Dec 2, 2017

Quote:

Originally Posted by AlphaC

@ Leoplate25 : About 40°C , see the stock load result from Steven's review
https://www.tweaktown.com/reviews/8460/gigabyte-z370-aorus-gaming-5-motherboard-review/index10.html

Without case airflow you'd get higher temps inline with playwares (~70°C in AVX2 Prime95) or the PC DIY Online chinese site (mirrored at http://tech.ifeng.com/a/20171025/44728408_0.shtml ~46°C) , or about 50°C at inductors (the squares with a "P" on them) per gecid (https://ru.gecid.com/mboard/gigabyte_z370_aorus_gaming_5/).

This thread is only particularly relevant to unlocked CPUs with AVX loads. If you are using a locked CPU I would focus more on featureset (real features such as post code LED , audio solution, LAN/wifi, dual BIOs, etc. not aesthetic features). You will find that most likely the best ones without regard for VRM are likely the boards such as Asrock Z370 Extreme4 (~$120-140), MSI Z370 SLI PLUS (~$120-130).

The only problem is i already bought the motherboard and i'm waiting for my friend to bring me the i7-8700. But if i'm going to reach 40 degrees C it's ok, isn't it? Thank you again!

pastorx · Dec 2, 2017

Quote:

Originally Posted by skyhawk21

Gaming 5 will easily overclock 8700k to 4.7ghz and run it cool in ventilated case.

Only issue is vdroop on vcore and rails or a bad sensor that glitches giving the voltage readings... they fluctuate all voltages every second going up and down from what's set in bios even with llc on max.

Quote:

Originally Posted by Leoplate25

The only problem is i already bought the motherboard and i'm waiting for my friend to bring me the i7-8700. But if i'm going to reach 40 degrees C it's ok, isn't it? Thank you again!

Gaming 5 its fine with moderate OC. I I'm waiting mine with i7 8700k...

pastorx · Dec 3, 2017

Quote:

Originally Posted by roybotnik

Does anyone else have problems with the ITE8686E bugging out on the Gigabyte Gaming 7? Mine always does whenever I put the processor under heavy load. It's really annoying because the second IO chip gets the CPU temp from it, so once it happens, any fans controlled by the second chip get stuck at the last speeds they were running at. It also makes it so I can't see VRM temps once it happens.

Board has been excellent otherwise, aside from this one issue. I also wish that Gigabyte would expose more options in the UEFI.. like VRM phase control and switching frequency. For such sturdy board hardware it would be nice to have for testing.

@skyhawk21
Have you had any problems like this in your aorus gaming 5? Can you monitor the vrm temperatures at any time?? I hope that only happens in the gaming 7...

skyhawk21 · Dec 3, 2017

Sensor works ok for readings and stays working when vrm temp goes up.

Highest in my system was 76c for vrm temp and sensor still worked...

However, sensor readings show fluctuating voltages for everything like vdroop every second.

Also fans on that sensor stop working for a second and show 0 rpm then work again (system fans). Doesn't happen all the time though.

Kind of worrisome but system is stable for now overclocked to 4.7ghz with xmp 3200 ram.

Msi z370 board I tried did not have funny sensor or voltage readings. It did however throttle CPU since vrm temps went crazy high in a matter of seconds. Had to return.

On the fence about gaming 5 because of the every second fluctuating voltages off this s wacko sensor, don't know if it's truly the motherboard silicon or stupid faulty sensor, but I guess if it was a bad board, it wouldn't work.. and it works, so...

Good luck!
Quote:

Originally Posted by pastorx

@skyhawk21
Have you had any problems like this in your aorus gaming 5? Can you monitor the vrm temperatures at any time?? I hope that only happens in the gaming 7...

ZaknafeinGR · Dec 3, 2017

@Leoplate25 You have nothing to worry about with the Gaming 5 and a locked 8700.

@pastorx Never had an issue with the VRM temps, the reading goes up or down in line with the load placed on the CPU and the current drawn. Vcore reading on the other hand is all over the place, while the 8792E Vcore reading seems much more reliable. Here's a screenshot for comparison:

pastorx · Dec 3, 2017

@skyhawk21
Could it be a PSU failure?
Quote:

Originally Posted by ZaknafeinGR

@Leoplate25 You have nothing to worry about with the Gaming 5 and a locked 8700.

@pastorx Never had an issue with the VRM temps, the reading goes up or down in line with the load placed on the CPU and the current drawn. Vcore reading on the other hand is all over the place, while the 8792E Vcore reading seems much more reliable. Here's a screenshot for comparison:

@ZaknafeinGR
It is a relief to hear that there are no problems reading the temperature. Does your sensor readings show fluctuating voltages for everything? I Dont understand why a voltage {Vcore} that should not vary, indicate different results in two different sensors {ITE8686E } {8792E} on the same card {Aorus gaming 5 }. or I'm wrong and it's common...

ITE8686E bugging, or it just is not accurate? or it's just vdrop?

thanks for your answers.

aliquiswe · Dec 3, 2017

I have from Komplett previous ordered:
1499 SEK, ASUS Z370 Strix F
1699 SEK, MSI Z370 Gaming M5

Of these I have a feeling the Strix F is the better board and the one I should have.

Proshop normally sell:
1690 SEK, ASRock Z370 Extreme4.

This weekend however they sell:
1799 SEK, ASRock Z370 K6

Should I order the K6 or not?
+ It's my understand it add M.2 key E, additional USB 3.1 gen 1, 2 more SATA slots (though usage of M.2 may remove 2 additional ones) and better VRM hardware together with the Extreme4, it also have one additional LAN port and their Fatal1ty software package and better looks over the Extreme4.
- But is the LLC issue still one and a permanent one and make it a worse choice? Also the K6 have even worse sound than the Extreme4 for some reason, and well it's still 300 SEK over the Strix F too.

Second LAN could be ok for NAS since I have no modern gigabit hub, front USB and Key E I guess isn't the most important things in the world. On other motherboards using the M.2 slots without SATA only seem to remove 2 SATA slots and 4 is ok I guess.

So... what should I do? =P

K6 FDPC5030SG is better than Extreme4 SM7341EH (more ampere and faster rise times it seems)? Does the good hardware matter if it .. doesn't deliver in actual usage? =P.

amd7674 · Dec 3, 2017

Hi Guys...

I have Taichi and I'm very happy with it and I haven't noticed/experianced any overheating/VRM issues. I have non delided 8700k CPU (waiting forever to get paste

). I have push it easily to stable 4.9ghz on 1.3V. Max temps 86C when running realbench. I couldn't get stable 5Ghz (I only tried to go up to 1.36V, since I was reaching +91C already. I will continue once I get CPU delided. I'm using D15 air cooler.
Quote:

Originally Posted by RustySpoons

My ITX is in a Phanteks Shift-X case, which doesn't have a front panel audio header, so fortunately for me working the wrong way round is actually beneficial to me

Quote:

Originally Posted by pastorx

There are contradictions also in other motherboard reviews for example the taichi, in tweaktown it throws a good temperatures, but in tomshardware it is not like that, although the temperatures improved a bit in future bios updates, but even higher than in Tweaktown review.

Tweaktown>
{ The Z370 Taichi produced excellent VRM temperature results, and that isn't very surprising as the 60A inductors, dual N-channel FETs, and new Intersil PWM work together in harmony. Temperatures on the front were always higher than on the rear of the motherboard, which means that the motherboard is being cooled well. Quality in the VRM section of the motherboard is superb}

Read more: https://www.tweaktown.com/reviews/8381/asrock-z370-taichi-motherboard-review/index10.html

Tomshardware
{Heat problems are the first mark against the Taichi, followed by excessive power consumption and overclocking weaknesses. This combination of factors almost makes it look like the power section was lifted from the Z270 Taichi, which was optimized for four-core rather than six-core CPUs. And while some of these issues might be minimized in future firmware revisions, we're not ready to label this one "fully acceptable" to qualify for our Approved award. And if it can't get over that hurdle, the value-oriented "Recommended" award would require a vaulting pole. We didn't find one in the installation kit.}

Read more: http://www.tomshardware.com/reviews/asrock-z370-taichi-intel-coffee-lake-atx-motherboard,5279-4.html

Quote:

Originally Posted by AlphaC

Who do you trust more? 8pack, Siliconlottery, and Steven from tweaktown or Tom's hardware? The mosfets used along with the heatsink design has been proven on other platforms.

Also note hardwareluxx user results.

SiliconLottery binning stats for i7-8700k
As of 12/01/17, the top 16% of tested 8700Ks were able to hit 5.2GHz or greater. (AVX Offset 2 ; < 1.425V Vcore)
As of 12/01/17, the top 43% of tested 8700Ks were able to hit 5.1GHz or greater. (AVX offset 2 ; < 1.412V Vcore)
As of 12/01/17, the top 72% of tested 8700Ks were able to hit 5.0GHz or greater. (AVX offset 2 ; < 1.40V Vcore)
As of 12/01/17, the top 99% of tested 8700Ks were able to hit 4.9GHz or greater. (AVX offset 2 ; < 1.387V Vcore)

and for i5-8600k
As of 12/01/17, the top 13% of tested 8600Ks were able to hit 5.3GHz or greater. (AVX offset 2, < 1.437V Vcore)
As of 12/01/17, the top 38% of tested 8600Ks were able to hit 5.2GHz or greater. (AVX offset 2, < 1.425V Vcore)
As of 12/01/17, the top 65% of tested 8600Ks were able to hit 5.1GHz or greater. (AVX offset 2, < 1.412V Vcore)
As of 12/01/17, the top 84% of tested 8600Ks were able to hit 5.0GHz or greater. (AVX offset 2, < 1.40V Vcore)
As of 12/01/17, the top 98% of tested 8600Ks were able to hit 4.9GHz or greater. (AVX offset 2, < 1.387V Vcore)

)_

Z370 / Z390 VRM Discussion Thread

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