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Skylake-X - running an i9-7980XE at 1.425V VCore 24/7

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post #31 of 37 (permalink) Old 11-15-2018, 08:24 PM
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Quote: Originally Posted by mikegold10 View Post
Some comments:
  • Your memory's tRFC looks way too high. It should be closer to 280 which would improve your Cinebench score if that is stable.
  • Your min/current/max core clocks should all be the same. What power scheme do you have set up and are you allowing for cores to clock down via SpeedStep (i.e., your multipliers are set to 33x-47x)?
  • Your mesh (aka uncore) looks correctly configured at a fixed 32x (I don't see your mesh voltage or I am missing it or it is cut off somewhere. This is odd.)
  • It may be possible to lower Vccin without degradation. You might want to give that a shot and run Cinebench and other benchmarks to test for stability. You're not even close to phantom throttling levels.
  • Your DRAM bank voltages are significantly different, but I am assuming this is by design.

So the above is some stuff from a casual inspection. The temps look a bit high, but I don't know your cooling and CPU configuration (i.e., delidded? relidded? direct die framed? TIM type, etc...?)

Hopefully this helps.
Hi,
As far as I've noticed VTT is mesh/ cache voltage Max 1.192v as he posted for 32
I personally would love to see a text file of the settings you've altered

CPU
i9-9940x With Optimus Foundation copper-plexi and Heatkiller VRM Plexi-Copper water block
Motherboard
ASUS x299 Rampage VI Apex
GPU
Titan Xp with copper Water Block
RAM
Trident Z 3600C16 4x8gb's b-die default timings 16-16-16-36
Hard Drive
Samsung 970 Evo Plus 500gb M.2/ Samsung 850 Pro 256gb for os and 500gb evo for favorite games plus other wd hdd's for data and backup's
Optical Drive
LG Blu-Ray WH16NS40
Power Supply
evga 1200-P2
Cooling
2-280GTX Black Ice Nemesis rads with D5 pump-res combo and D5 top before and after rads.
Case
corsair 450D with added 2nd floor to house radiator on top
Operating System
Win-7 pro & 10 pro Win-7 Primary os.
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post #32 of 37 (permalink) Old 11-17-2018, 08:30 AM
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Quote: Originally Posted by mikegold10 View Post
If you are direct die framing and with the cooling you described, your temps are terrible. They should be in the 50s tops. So, there is much left to tune, including reducing Vccin as much as possible (without losing stability or CB score).
That's a LCC cpu, temps are ok with that power draw.
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post #33 of 37 (permalink) Old 11-17-2018, 09:50 PM - Thread Starter
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This is how you overclock - just set the world Cinebench R15 H2O record with i9-7980XE:

Spoiler!


I am now #28 and seven points away from the best score of chiller users (with just room temp water custom cooling).

Link to hwbot rankings: hwbot - Cinebench R15 rankings
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post #34 of 37 (permalink) Old 11-21-2018, 09:24 AM
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Hi,
Sure would like to see a text file from bios and see what all you've done
Can't remember how to actually get a text file out of bios though :/

CPU
i9-9940x With Optimus Foundation copper-plexi and Heatkiller VRM Plexi-Copper water block
Motherboard
ASUS x299 Rampage VI Apex
GPU
Titan Xp with copper Water Block
RAM
Trident Z 3600C16 4x8gb's b-die default timings 16-16-16-36
Hard Drive
Samsung 970 Evo Plus 500gb M.2/ Samsung 850 Pro 256gb for os and 500gb evo for favorite games plus other wd hdd's for data and backup's
Optical Drive
LG Blu-Ray WH16NS40
Power Supply
evga 1200-P2
Cooling
2-280GTX Black Ice Nemesis rads with D5 pump-res combo and D5 top before and after rads.
Case
corsair 450D with added 2nd floor to house radiator on top
Operating System
Win-7 pro & 10 pro Win-7 Primary os.
Monitor
ASUS VG248QE 24" 144Hz
Keyboard
Logitech G910 Orion spectrum
Mouse
Redragon Perdition
Audio
Built in realtek and Insignia 2.0 soundbar HSB318
Other
5.0/https://valid.x86.fr/ez2ifr
CPU
i7-5930k with Heatkiller IV Pro Plexi-Copper and koolance vrm water blocks
Motherboard
X99 Sabertooth
GPU
EVGA 1080ti FTW3 with Water block
RAM
Trident-Z 3200C14 4x8gb's b-die default timings 14-14-14-34
Hard Drive
Samsung 970 Evo 500gb M.2/ Samsung 850 Pro 256gb for os and 500gb evo for favorite games plus other wd hdd's for data and backup's
Power Supply
EVGA 1000-P2
Cooling
2-240 GTX Black Ice Nemesis rads/ D5 pump-res combo and D5 top before and after rads.
Case
Corsair 450D with added 2nd floor to house radiator on top
Operating System
Win-7 and 10 pro Win-7 Primary os.
Monitor
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Mouse
Red Dragon Perdition
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post #35 of 37 (permalink) Old 06-28-2019, 11:17 AM
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High vCore voltage on the 7980xe

As long as you manage the heat then you will be fine. Been running mine at 1.41v @4.9Ghz 24/7 for more than 1 year. I also ran it at 1.43v @5.1Ghz 24/7 for a couple months.

I managed the heat by delidding & liquid metal (super easy on that model) and overkill water cooling (EKWB) gear. If you won't delid, then dial it down a notch just for stability but always check your temps - @87-90C it will still last a lifetime.

You will likely never get through your processor unless you always run it at 102C+. It's all about heat, less about voltage. The processor has plenty of over-voltage protection as well.

Also, a trick is to only run some cores which don't overheat at those levels (and tune down the others), and you'll get 90% of the results anyways on most multi-threaded apps (i have around 10 cores that can run even higher without pushing temps above 90-92C).

My 2 cents from 24 years of experience trying to make things run faster than they are designed to. ;-)

Cheers, and hope that helps.

eXcess
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Motherboard
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GPU
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post #36 of 37 (permalink) Old 12-15-2019, 03:24 PM
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After running my i9-7980xe for 2 years at 4.7GHz, I can no longer achieve those speeds without getting random errors or BSOD.

Had to step down to 4.3GHz.

The weird thing now is that even running a 4.3GHz I get temperature similar to what I used to get at 4.7GHz (100% CPU usage in intel XTU stress test) : 84C max.
I've opened the CPU waterblock and there was heaps of green fibre in it. I cleaned it up, Re-paste (thermal grizzly kryonaut), no much difference.

The i9-7980xe got delidded about 2 years ago and using liquid metal.

idle speed at around 29C.

This is with an ASRock X299 professional gaming XE board.

I've set the voltage to static, 1.20V on all cores, and it's stable.

Suggestions on what else to investigate.
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post #37 of 37 (permalink) Old 12-15-2019, 09:27 PM
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Quote: Originally Posted by jyavenard View Post
After running my i9-7980xe for 2 years at 4.7GHz, I can no longer achieve those speeds without getting random errors or BSOD.

Had to step down to 4.3GHz.

The weird thing now is that even running a 4.3GHz I get temperature similar to what I used to get at 4.7GHz (100% CPU usage in intel XTU stress test) : 84C max.
I've opened the CPU waterblock and there was heaps of green fibre in it. I cleaned it up, Re-paste (thermal grizzly kryonaut), no much difference.

The i9-7980xe got delidded about 2 years ago and using liquid metal.

idle speed at around 29C.

This is with an ASRock X299 professional gaming XE board.

I've set the voltage to static, 1.20V on all cores, and it's stable.

Suggestions on what else to investigate.
Still on the same bios. I know that newer ones for my board made it run hotter for same voltage and temps are a really big thing for my chip. If I can keep it under 60C it will do 5.2ghz on same voltage that will only do 5ghz at 85C. (Thank god for chillers)

Next up all the security software fixes make things a little less stable.
Remove all those unless your using your chip in multi-user VM enviroment.


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