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

[K0NG]

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.


 

[Mister Woof]

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.

[Falkentyne]

5 hours ago, K0NG said:

Hi LTT Community

LLC Maxed out

 

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.....)

[xg32]

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.

[K0NG]

On 9/21/2019 at 7:36 AM, xg32 said:

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.

i have a z390 extreme4 now. and i have the same problem as before.. it is the CPU.

btw. why wouldn't you run an 8600k on a Strix H? (same vrm)