8086K issues

andyartois · 9 Jun 2018 at 14:15

Thanks to the usual excellent service from Overclockers today an 8086K dropped through the post box today. Unfortunately it's proved not to be a smooth ride, I seem to be getting odd boot issues, sometimes failing to POST with different codes, when in the UEFI it can be sluggish/unresponsive and even a distorted screen. Other times it can take several minutes to finish the POST before getting into Windows 10. Applying the XMT profile causes instability in Windows whilst running at stock (MCE on or off).

I cleared the CMOS after removing my 8700K and set back to the usual settings but alas the problems persist. Am I early to the party here, do you think a BIOS update is needed? I had no stability issues with the 8700K so it does smack of a compatibility issue. Not trying for any overclocking at this stage, just looking for a stable system. Not much online about the 8086K yet so any help welcome. Temps look fine, CPU shows up correctly in both the UEFI and CPU Z.

Specs:

8086K under Corsair H115i AIO
ROG Maximus X Hero Z370 with latest 1301 BIOS
16GB Corsair 3000 MHz (2 x 8GB)
850W Corsair HX850i
Samsung SM951 M.2 PCI-e ACHI SSD 512GB
AMD Radeon 470 4GB
4TB Seagate SATA drive
Sound Blaster Z

chaparral · 9 Jun 2018 at 15:20

Have you tried with everything that possible to unplug/removed

I.E soundcard / 4TB sata drive / Remove all USB items apart from mouse & keyboard etc

humbug · 9 Jun 2018 at 16:07

They are both the same CPU just differently named so there really shouldn't be any issues.

Hagar · 9 Jun 2018 at 16:08

Possibly due to overtightening the cooler?

It should be a direct swap as you indicate, it is a binned 8700K anyway I understand. Possibly you have disturbed something when refitting, ie an electrical connection, ram etc.

Locky · 9 Jun 2018 at 16:43

put mine together today and can't really get it running higher than 3200mhz memory. I bought the 8pack 4000mhz kit and it won't even post with XMP or any speed 3600mhz or higher.

gavinh87 · 9 Jun 2018 at 16:44

Locky said:
put mine together today and can't really get it running higher than 3200mhz memory. I bought the 8pack 4000mhz kit and it won't even post with XMP or any speed 3600mhz or higher.

4 dimm board?

Locky · 9 Jun 2018 at 16:52

gavinh87 said:
4 dimm board?

There is 4 dimm slots and I'm using 2 of them (2x8b)

kitfit1 · 9 Jun 2018 at 17:00

Locky said:
put mine together today and can't really get it running higher than 3200mhz memory. I bought the 8pack 4000mhz kit and it won't even post with XMP or any speed 3600mhz or higher.

Have you got each stick in the correct Dimm slot ?

chaparral · 9 Jun 2018 at 17:02

Locky said:
put mine together today and can't really get it running higher than 3200mhz memory. I bought the 8pack 4000mhz kit and it won't even post with XMP or any speed 3600mhz or higher.

Which motherboard ?

The Asus apex motherboard is meant to be the best for very high memory overclocks..

I have not tried clocking my ram over 3200mhz c14 on my Maximus X formula yet

Locky · 9 Jun 2018 at 17:09

it's a Strix Z370-h

gavinh87 · 9 Jun 2018 at 17:31

Locky said:
it's a Strix Z370-h

I can hit 4000mhz on the hero x but timings are so loose its not worth it. 3600 C15 is a decent speed.

kitfit1 · 9 Jun 2018 at 18:07

gavinh87 said:
I can hit 4000mhz on the hero x but timings are so loose its not worth it. 3600 C15 is a decent speed.

Unless of course it was on a CH6, in which case you would regard 3600 C15 as rubbish

And there was me led to believe that 4000 @ 5Ghz was a walk in the park.............................just dial it in and off ya go

amigamc · 9 Jun 2018 at 18:44

tempted to get one myself but this has put me off, I would need a new motherboard too, so what would everyone recommend, leaning towards gigabyte aorus gaming 7 or seeing who updates ther bios first.

orbitalwalsh · 9 Jun 2018 at 20:13

What's the cashe /uncore speed on these things ?

gavinh87 · 10 Jun 2018 at 08:39

kitfit1 said:
Unless of course it was on a CH6, in which case you would regard 3600 C15 as rubbish And there was me led to believe that 4000 @ 5Ghz was a walk in the park.............................just dial it in and off ya go

Board limitations..... Not cpu.

jigger · 10 Jun 2018 at 11:38

chaparral said:
Which motherboard ?

The Asus apex motherboard is meant to be the best for very high memory overclocks..

I have not tried clocking my ram over 3200mhz c14 on my Maximus X formula yet

Not much point overclocking the memory past that on an Intel system.

jigger · 10 Jun 2018 at 11:39

OP easy solution. Pop the 8700 back in.

andyartois · 10 Jun 2018 at 12:24

nkata said:
Possibly due to overtightening the cooler?

Excellent shout, I had tightened the AIO with a screwdriver (had stopped when I felt resistance), I loosened slightly so these were hand tight. Seems to be booting each time now which is great progress. Thanks for the pointer.

I still have an issue setting the XMP profile however. Whilst it does apply the correct timings on the RAM I have noticed the core voltage shoots up from 1.120v to 1.41v when this is applied. The clock speed also drops back from a 4.3GHz all turbo stock speed to 3.2Gz under load which suggests it is throttling with that voltage. The UEFI becomes sluggish with the XMP setting on and I get oddness in Windows with display issues such as "link failure detected" which kills the refresh rate on my 4K monitor from 60Hz to 30Hz and general instability so have reverted back.

BIOS shows no changes to the voltage settings as Auto is left selected when applying XMP so no idea where this cure voltage oddity is occurring. Again I didn't have this issue with the 8700K, just the memory timings used to change when applying XMP. I have reverted back to non XMP settings for now and will hold out for a BIOS update, suppose I could try to dial them in manually.

jigger said:
OP easy solution. Pop the 8700 back in.

Well where is the fun in that

Seriously though it might be worth a test to see everything works as expected. Have a buyer waiting for the 8700k so will put them off for a few weeks.

orbitalwalsh said:
What's the cashe /uncore speed on these things ?

Same as the 8700K, this just has a higher single core boost and default clock speed. Exactly a 0% increase in performance on a fully threaded workload to keep inside the same TDP.

MidnightFawn · 11 Jun 2018 at 11:43

Did you manage to find out what the issue was, as i also have the ROG Maximus X Hero Z370 with latest 1301 BIOS and was planning on getting the 8086K to replace my delidded 8700K, but now a bit dubious about buying one..

humbug · 11 Jun 2018 at 14:53

MidnightFawn said:
Did you manage to find out what the issue was, as i also have the ROG Maximus X Hero Z370 with latest 1301 BIOS and was planning on getting the 8086K to replace my delidded 8700K, but now a bit dubious about buying one..

I don't understand why anyone with an 8700 would, its exactly the same CPU under a different name.