Overclock.net banner

1 - 20 of 75 Posts

·
⤷ αC
Joined
·
11,239 Posts
Cliffnotes:
i7-8700k @ 4.9GHz-5GHz with 1.25V-1.3V V_core is normal
  • Load XMP
  • Set Multi
  • Disable C-states
  • Disable VT-d (not an option for virtual machine users IMO)
  • Set Uncore frequency to 45 multiplier , 40 multiplier to start
  • Adjust V_Core under M.I.T. page under 1.35V suggested , starting with 1.28V
    ---> V_Core adjusts Uncore as well
  • "Optional" LLC set to Turbo/Extreme <-- shouldn't be optional right??? Isn't Turbo too high?
  • Optional VCCIO 1.4-1.45V is high but OK
  • Optional BCLK , adjust from the normal 100MHz
  • Use Prime95 Small FFTs to test for stability , with AVX offsets as necessary
  • Delid removed 15-20°C (OCUK observed 20-25°C) ; 5.1GHz+ requires delid
 

·
Registered
Joined
·
289 Posts
Quote:
Originally Posted by AlphaC View Post

Cliffnotes:
i7-8700k @ 4.9GHz-5GHz with 1.25V-1.3V V_core is normal
  • Load XMP
  • Set Multi
  • Disable C-states
  • Disable VT-d (not an option for virtual machine users IMO)
  • Set Uncore frequency to 45 multiplier , 40 multiplier to start
  • Adjust V_Core under M.I.T. page under 1.35V suggested , starting with 1.28V
    ---> V_Core adjusts Uncore as well
  • "Optional" LLC set to Turbo/Extreme <-- shouldn't be optional right??? Isn't Turbo too high?
  • Optional VCCIO 1.4-1.45V is high but OK
  • Optional BCLK , adjust from the normal 100MHz
  • Use Prime95 Small FFTs to test for stability , with AVX offsets as necessary
  • Delid removed 15-20°C (OCUK observed 20-25°C) ; 5.1GHz+ requires delid
1.3V is considered the limit for a non-delidded chip? Also, VT-d limits overclocking potential?
 

·
⤷ αC
Joined
·
11,239 Posts
Most users not delidding see 90°C even on a 240mm CLC water cooler.
Quote:
Originally Posted by https://forums.overclockers.co.uk/threads/8packs-no-bs-testing-intel-8700k-and-z370-with-delid-5ghz-and-above-available-from-ocuk.18795262/

Overclocking 8700K on low end Air Cooler like Cooler Master EVO 4.7-4.8ghz is possible on average silicon this is because max voltage you can use for non avx stress testing is around 1.225v before temps are late 80 degree C using stock TIM. Cache and mems cant really be pushed on this type of cooling as SA IO volts add to heat output. Cache really goes high on 8700K but in my testing only with voltages around 1.35v+ which is not possible on this type of cooler.

Overclocking 8700K on 240mm AIO like Asetek 240mm 4.8-4.9ghz is possible on average silicon this is because max voltage you can use for non avx stress testing is around 1.28v before temps are late 80 degree C using stock TIM. Cache and mems cant really be pushed on this type of cooling as SA IO volts add to heat output. Cache really goes high on 8700K but in my testing only with voltages around 1.35v+ which is not possible on this type of cooler.
 

·
Registered
Joined
·
289 Posts
Quote:
Originally Posted by AlphaC View Post

Most users not delidding see 90°C even on a 240mm CLC water cooler.
Hm, it didn't seem that bad for me, but then again I'm using a board with Vdroop issues... It almost seems pointless even trying to overclock without delidding.
 

·
Premium Member
Joined
·
522 Posts
Discussion Starter #8
Quote:
Originally Posted by Techhog View Post

1.3V is considered the limit for a non-delidded chip? Also, VT-d limits overclocking potential?
I wouldn't say 1.3 is the limit, its the average. You can go higher depending on temps. Delidding definitely drops temps significantly. VT-d is simply one less item for the board to initalize that 99% of people don't use... Guys like dino (professional overclockers) tend to disable everything they can to eliminate as many variables as possible.
 

·
Registered
Joined
·
289 Posts
Quote:
Originally Posted by GBT-MatthewH View Post

I wouldn't say 1.3 is the limit, its the average. You can go higher depending on temps. Delidding definitely drops temps significantly. VT-d is simply one less item for the board to initalize that 99% of people don't use... Guys like dino (professional overclockers) tend to disable everything they can to eliminate as many variables as possible.
I want to use VT-d, though... If I enable it I'll have to redo my testing and will most likely lose some of my overclock?
 

·
Registered
Joined
·
4,783 Posts
So do not disable it. Your looking for max oc based on however you'd use your computer. In your case that means leaving VT on.

I don't have this board yet but I'm leaning towards it. Processor was shipping out today. Came here hoping to read about any problems.
Quote:
Originally Posted by Techhog View Post

I want to use VT-d, though... If I enable it I'll have to redo my testing and will most likely lose some of my overclock?
 

·
Premium Member
Joined
·
522 Posts
Discussion Starter #11
Quote:
Originally Posted by CrazyHeaven View Post

So do not disable it. Your looking for max oc based on however you'd use your computer. In your case that means leaving VT on.
^ This. Leave it on if you are going to use it... Often OC'ers (and by OC I mean LN2 in a lab looking for records) disable audio and LAN as well, which is not a real world usage.
 

·
Registered
Joined
·
1,212 Posts
Quote:
Originally Posted by GBT-MatthewH View Post

Hi guys,

Wanted to share an OC Guide fresh out of our OC lab. There is also a video if you are so inclined.

Let me know if you guys have any questions!
MatthewH, I got 5Ghz with -2 AVX offset, but I have no idea how much voltage I'm using with DVID +0.75.

Which sensor is more accurate? I'm hoping it's the second one, because the first one bugs out a lot and read a lot higher.



Is there a way to switch the UEFI being used? Every hard lock flips which one is used...
 

·
Premium Member
Joined
·
522 Posts
Discussion Starter #13
Quote:
Originally Posted by Exilon View Post

MatthewH, I got 5Ghz with -2 AVX offset, but I have no idea how much voltage I'm using with DVID +0.75.

Which sensor is more accurate? I'm hoping it's the second one, because the first one bugs out a lot and read a lot higher.



Is there a way to switch the UEFI being used? Every hard lock flips which one is used...
Not sure on the Vcore / HWInfo... Try CPU-z.

On this board there isn't a BIOS switch, so you can't manually switch from main/backup.
 

·
Registered
Joined
·
1,212 Posts
Quote:
Originally Posted by GBT-MatthewH View Post

Not sure on the Vcore / HWInfo... Try CPU-z.

On this board there isn't a BIOS switch, so you can't manually switch from main/backup.
From what I can see, CPU-Z reads 8686E until it goes nuts ( 2.4V ) and then it switches to the 8792E Vcore reading or VID.

8686E doesn't come back until I power cycle the system.
 

·
Registered
Joined
·
100 Posts
Hey, which one of the following temps is for the CPU VRMs?



I am guessing it's Temperature 3 on the 8686E as it goes up when I put load on all cores, just want to make sure.
 

·
⤷ αC
Joined
·
11,239 Posts
Should be temp 3. If you use SIV in gigabyte App center you should be able to get a more accurate overview of which sensors are for which location.
 

·
Registered
Joined
·
100 Posts
Updating HWinfo solved the issue, as it displays the sensor locations.
I would warn people against installing AppCenter though, it installs the EasyTune service (without prompting) and it overrides BIOS settings, which is rather annoying, I don't want to OC through a Windows app.
 

·
Registered
Joined
·
800 Posts
Quote:
Originally Posted by ZaknafeinGR View Post

Updating HWinfo solved the issue, as it displays the sensor locations.
I would warn people against installing AppCenter though, it installs the EasyTune service (without prompting) and it overrides BIOS settings, which is rather annoying, I don't want to OC through a Windows app.
Hmmm, I'll need to see if that is my problem.

I got everything up and running, enabled XMP (Profile 1), set all of my memory timings and voltages, but the BIOS insists on leaving my 3600 speed RAM at the 2600 speed setting. Been fighting with it on and off for 2 days and nothing I do in the BIOS seems to make any difference. I wouldn't think it would be so hard to get some GSkill Trident Z 3600 CL16 RAM to run at that speed.
 

·
Registered
Joined
·
100 Posts
@HKPolice, I don't know about safe, but I have to ask why... most people (and not just with Gigabyte boards) are using 0.95-1.1v for VCCIO and 1-1.15v for SA.

@moustang, with AppCenter my RAM was running at 2133, even though I had XMP enabled in the BIOS, so if you have AppCenter installed, you might want to uninstall it and then check if it's working. For what it's worth, my dimms worked fine just by enabling the XMP profile, even at stock CPU settings, without any further fiddling with timing/voltages. (It's a kit of 2x8GB F4-3600C16D-16GTZR G.Skill TridentZ)
 
1 - 20 of 75 Posts
Top