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xl3b4n0nx

Help! i9 9900k Trying to Reach 5GHz 24/7 Stable

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Posted · Original PosterOP

So I have 4 I9 systems that I need to get the best STABLE overclock out of. Here are the specs:

 

CPU: I9 9900k

Mobo: Asus Z390 Gaming-E

RAM: 64GB @ 3200MHz

Cooler: Corsair H100i Pro RGB 

Case: Rosewill RSV-L4000 (4U Rackmount)

 

Bios Settings are as follows: (Anything not listed is default) 

  • XMP I profile enabled
  • MCE: Auto
  • SVID Behavior: Best Case Scenario
  • CPU Core Ratio: Sync All Cores @ 50
  • Digi + VRM -> Load Line Calibration: Level 6 (Might have the name wrong, writing this from home)
  • Internal CPU Power Management -> IA AC Loadline & IA DC Loadline = 0.01
  • CPU Core Voltage: Manual = 1.3V

 

The machines are in a 64 F server room so ambient temp is not an issue. They will be used in a compute cluster to run FPGA builds and simulations which can be AVX heavy workloads. They will be run 24/7 and potentially be running the overclock for years at a time so stability is key. My goal is to get all chips to 5GHz (AVX/non AVX). My problem is that I am running into temperature issues. I am seeing temps in the 90s and sometimes 100c on some cores. The weirdest thing to me is that there can be a temperature delta of 13c between cores on the CPU. I don't know if this is common to 9900K or just a bad cooler mount. When I run prime95 to stress test I either have an incorrect result/hardware failure or a thermal shutdown. We got these CPUs specifically for the lightly threaded performance and every MHz matters. So if anyone has any suggestions on better BIOS settings it would be really helpful.

 

I plan to check the mounts on the coolers. No additional thermal paste was added to 3 of them, so I have a feeling that may be part of it.

 

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If stability is key, I'd just leave it at stock imo


My System: i7-8700k 5.0ghz All-core delidded @1.365v // Cryorig H7 Quad Lumi // Gigabyte Aorus Z370 Gaming 5 // 16GB Corsair Vengeance DDR4 3200 // XFX Radeon RX 5700 XT RAW II // NZXT S340 White // Seasonic Focus Plus Gold 850w // Intel 660P 1TB NVME M.2 SSD/1TB Samsung 860 EVO/1TB 2.5" HGST HDD // Displays: ASUS VG248QE/Acer K242HYL/Acer K242HYL // Corsair K68 Mechanical Keyboard - Logitech G502 // Corsair H70 Gaming Headset

 

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28 minutes ago, xl3b4n0nx said:

I am seeing temps in the 90s and sometimes 100c on some cores

5GHz AVX-workload with MCE enabled? Yeah, that sounds about right to me.


Hand, n. A singular instrument worn at the end of the human arm and commonly thrust into somebody’s pocket.

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31 minutes ago, xl3b4n0nx said:

Cooler: Corsair H100i Pro RGB

Could always try swapping out for a 360mm AIO instead and possibly cranking pump-speed up as well.


Hand, n. A singular instrument worn at the end of the human arm and commonly thrust into somebody’s pocket.

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Posted · Original PosterOP
23 hours ago, Plutosaurus said:

If stability is key, I'd just leave it at stock imo

We bought i series for the overclocking so leaving stock wouldn't make much sense. We already have 4 6700K and 7700K overclocked. Just doing the same with the newest platform.

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the lowest voltage i've seen for 5.0 AVX is around 1.38v, even if it's 1.35v on a golden chip that's not something the h100i can handle.


9900k 1.39v 5.2 83C 185w 1.24v 4.9 60C 135w 1.05v 4.5 90w 50C (doing some testing for hot days) all-2avx cinebench/blender temps. avx voltages in prime. ll D15 ll Z390 taichi ult 1.60 bios fixed LLC voltage gaps ll gskill 2x8gb cl16 ddr4000 bdie 1.42v ll EVGA 2080 ti XC (duo fan skinny) 1995//7600 power limited 79C max, stock voltage (really bad ocer) ll 2x samsung 860 evo 500gb raid 0 ll 500gb nvme 970 evo ll Corsair graphite 780T ll EVGA G2 1300w ll Windows 10 Pro ll NEC PA272w (movie, work mon) 2k60 14bit lut ll Predator X27 4k144 hdr (rgb98)

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Personally, I would turn off MCE.  Doing so allowed me to hit 5.1 and be stable.  So far I've been using the machine for video encoding, and other tasks and not one BSoD or other issue.   With MCE on, it crapped out doing simple benchmarks and other stress tests.  Not saying this will solve your issues, or get you higher speeds, but it isn't a helpful feature when manually OCing.

 


Asus ROG Maximus XI Extreme, Intel i9 9900K (5.1GHz, no AVX offset, 4.9GHz cache and 1.295V), 16G G. Skill Trident Z RGB 3200 CL14, EVGA GTX 760, Corsair H115i Pro, Samsung 970 EVO Plus 512 GB (x2), Corsair RM1000i PSU, Windows 10 Pro (1903).

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