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8086k requires now up to 100mv more per 100 Mhz.degraded?

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Posted · Original PosterOP

Hi LTT Community

8086k (delid)
Asus Z370 TUF Gaming Pro (was from a 8600k rig) ( H115i PRO 280mm rad) in a high airflow case (Corsair air 540 with no dust filters and bequiet! Shadow wings 3 fans.)
16GB 3200 Mhz Ripjaws V OCd to 3600 Mhz
Zotac 2080 Ti Amp Extreme.
EVGA Supernova 750W PSU

after around 5 months of heavy usage of my 8086k  (144hz gaming, rendering and benchmarks with around 15 hours uptime per day) i had several BSODs. (mostly WHEAs and Watchdog timeouts)

freshly installed windows had the usual troubleshooting and found out that my OC is unstable... increased Vcore and everything is fine again.

i bought the CPU brand new a few days before new years eve last year (18/19) and delidded it after 2 weeks of testing.
The Result for a 100% Stable OC was the following.
LLC Maxed out
5 Ghz / 4.9 Ghz Cache = 1.32v (1.296 - 1.312 under load)
5.1 Ghz / 5 Ghz Cache = 1.37v (1.344 - 1.36 under load)
5.2 Ghz / 5 Ghz Cache = 1.42v (1.376 - 1.392 under load)

Stable means at least 12 Hours of Prime95 (latest) with AVX Blend, 1344k, Max Heat.
Memtest86 for 12 Hours
Aida64 Extreme Stresstest for Core, cache and memory.
And around 1 Week of every day use from high refreshrate gaming over rendering videos and running Benchmarks.

since end of march the CPU is locked at 5.1 GHz Core and 5 GHz Cache at 1.36v (1.375v in Bios).
CPU Temps were in the low 40s in games like now borderlands 3, and around the high 50s in games like BFV.
VRM Temps between 50°C and 70°C
the pc gets cleaned weekly
resetted the CMOS
ran at stock settings (no issues)

Now the Problem.
the 5 Ghz Profile now needs 1.38v to run stable
the 5.1 Profile needs over 1.44v
and the 5.2 Profile does not even boot at 1.48v

this all happened in a period of one week.

increased IMC,SA and other voltages slightly too.
and i have no other MB to test if it's the CPU or the Motherboard itself.
could it really be degraded that fast? does anybody else having issues like that with his 8700k/8086k?

Sorry for my English (Not a native speaker) and this is my first post ever in a forum like this. :)


8086k Cinebench R20.jpg

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I dont think there's ever any guarantees with OC.


Mine has been good for almost two years now at 5ghz 1.355v, but I know it could take a shit on me at any time.

My System: i7-8700k 5.0ghz delidded @1.355v // Cryorig H7 Quad Lumi // Gigabyte Aorus Z370 Gaming 5 // 16GB Corsair Vengeance DDR4 3200 // Sapphire Radeon RX Vega 64 UV/OC 1677core/1050hbm // NZXT S340 White // Seasonic Focus Plus Gold 850w // Intel 660P 1TB NVME M.2 SSD/120GB PNY CS900/480GB PNY CS1311/1TB Hitachi Deskstar // Displays: ASUS VG248QE/Acer K242HYL/Acer K242HYL // Corsair K68 Mechanical Keyboard - Logitech G502 // Corsair H70 Gaming Headset


Wife's System: i7-8700 // Arctic Freezer 33 // Gigabyte Z390M Gaming // 16GB Corsair Vengeance LPX 3200 // Sapphire Vega 56 8GB // Thermaltake Versa H17 // Seasonic Focus Plus Gold 850w // 500GB Silicon Power A55/4TB Western Digital HDD // Displays: ASUS VG245H/ASUS VP248Q // Corsair K68 Mechanical Keyboard // Logitech G602


TV Gamer: Ryzen 5 1600 4.0Ghz // Wraith Spire // Gigabyte B450 Aorus M // 16GB Corsair Vengeance DDR4 3200 // XFX Radeon RX 580 8GB // Thermaltake Versa H17 // Corsair Vengeance 650W // 120GB Sandisk SSD/4TB Western Digital Blue // Display: 50" Westinghouse 1080p // Rii Wireless Mini Keyboard w/Touchpad/Xbox One Controllers


Son's System: i3-8350k 4.8ghz @ 1.35v // Cryorig H7 Quad Lumi // ASRock Z370 Extreme 4 // 16GB T-Force Vulcan 2667 // ASUS Radeon RX 570 4GB // NZXT S340 Black // Seasonic S12II 620w Bronze // 525GB Crucial MX300/500GB Wester Digital Blue // Display: Dell P2417H - Eagletech KG010 Mechanical Keyboard // Logitech G203


Daughter's System: i5-4570 // ASUS H81I-Plus // 8GB Corsair DDR3 XMS2 1333 // Zotac GeForce GTX 1060 3GB Mini // Cooler Master Elite 130 // Corsair CX600M // 120GB Sandisk SSD/500GB Western Digital Blue // Display: AOC 20" // Eagletech KG010 Mechanical Keyboard // HP Business Mouse

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5 hours ago, K0NG said:

Hi LTT Community

LLC Maxed out


8086k Cinebench R20.jpg

That's why it degraded.

Maxing out the LLC at anything higher than a 1.250v bios voltage is risking running the chip beyond electrical specifications. (Intel specifies a 2.1 mOhms VRM loadline at 138 amps current.  That's about 1.220v on-die measured voltage at 138 amps of current.  You're using a 0 mOhms loadline.....)

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could be the mobo vrm, i wouldn't even run a 8600k on that mobo, or even bench with maxed out LLC and a 8086k 5ghz on that board, let alone everyday use. I give it less than 2 years before a cap goes under these settings.

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 4x samsung 970 evo 256gb (asus hyper pcie m2 raid card) ll 2x samsung 860 evo 500gb raid 0 (<--i should've went with 1tb nvmemistake of the build) ll EVGA 2080 ti XC (duo fan skinny) 1995//7600 power limited 79C max, stock voltage (really bad ocer) 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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