The reason behind the fast 13/14th gen i9 degrade and how to evade it!

[User349947]

The actual cause for the extremely fast degrede of i9 chips is actually intels own turbo boost algorithm on those two "favored" cores. While monitoring with multimeter at the back of the CPU socket i noticed some voltage spikes up to 1.65v on my 14900KF because of the two 6.0GHz P cores when opening apps, alt-tabbing and browsing with Chrome. leaving the CPU for 1-2 months with that voltage wont end well and degrades it with more than 100mv. then the constant BSOD and crashes start to happen!

Currently the only solution to actually preserve your new i9 is not with applying some forced power limits which cripples your CPU, but setting the turbo ratio to all core boost instead of the default per core and manually limiting the maximum voltages! Also is good to disable Turbo Boost 3.0 which forces more load on those specific two favored cores mentioned and has nothing to do with the actual turbo.

This is an example of what you should set around, use it as a guideline and if your silicon is stable with less than this, the better! Moving above said voltages is an indicator that your chip has already started degrading since they are +50mv above the minimum voltage possible for the "average" bin.

13900K/KF - 55p 43e at 1.27v
13900KS - 56p 43e at 1.30v
14900K/KF - 57p 44e at 1.30v
14900KS - 59p 45e at 1.42v

Turbo Boost 3.0 - DISABLE
Enhanced Turbo - DISABLE

[Keean]

So some further testing, with a core ratio limit of x58, the chip is stable at (AC/DC) 0.8/0.8. It is not stable at 0.7/0.7 down to 0.5/0.5, but then is stable again at 0.4/0.4 and 0.3/0.3 (but significantly slower)... it looks like once the voltage drops below a certain level it falls back to a slower clock speed, and is stable again. This shows you have to be careful jumping straight to load line value like 0.3/0.3 as it can be completely stable, but you are losing performance, because its operating in a lower "gear".

I think the fact that the chip is stable at 0.8/0.8 at x58, but requires 1.4/1.4 to be stable at x59 shows there is some kind of discontinuity there... 

Testing with hyper-threading disabled the CPU is stable at (AC/DC) 0.8/0.8 with no core ratio limit, and is able to boost to x62 on both preferred cores with a single-threaded load, and x59 on the others with an all p-core load.

So something clearly goes wrong at x59 and above with hyper-threading enabled.

[Keean]

@User349947when you give 1.42v for 14900ks, where is this voltage measured?

Is this the voltage set at the VRM (so it will actually be lower at the core depending on current, the more load the lower it will actually be because of vdroop)

Or is this the BIOS measured vcore, or from "in0" of the nct6798 chip (on my motherboard)...

For example, if I set the VRM output to 1.4v, the BIOS monitor shows 1.376v and "in0" of the nct6798 in the OS shows 1.25v. I am not sure which one I should be looking at?

One thing I didn't not realise until recently was the core voltage shown for each core in tools like i7z are read from the core MSR registers, and actually show the VID requested voltage, not the actual measured voltage, so these do not change no matter what offset or manual core voltage you set...

When I tested with the VRM output at 1.4v 7 of the 8 p-cores worked fine with both hyper threads loaded at x59, but one failed... I am trying again with the VRM output set to 1.5v

However neither of these can sustain all-core loads with 16 threads on the p-core, presumably because the vdroop at that kind of current is lowering the vcore on the chip too much...

[whysobsod]

If this claim is true.

It can be said that the 13/14th i9 i7 CPUs around the world are dying when they are not doing anything.

And since systems equipped with powerful cooling solutions will attempt to boost clock more often, death will occur more quickly.

My 14900k also deteriorated stably only by increasing 0.04V in 2 months.

[User349947]

Your chip can still be saved! I had multiple i9 which degraded between 0.07 to 0.10 in about 1-2 months and only one has survived till now with zero degrade, and it is the only one i had with static voltage and manual all core ratio because it is inside a small ITX case which is quite hot and has zero airflow, the rest were all at stock BIOS defaults and on a custom loop!

I have never turned off those PCs, they are 24/7 active and we connect to them remotely via Parsec to game on, and at some point the constant BSOD and crashing started so the remote became unreliabe which defeated its sole purpose.

[KLOMBT]

Hey I see you understand about PCs so I got an i7 14700k with msi z790 motherboard and my idle temps are at 75 to 80C I used it like this for about a month so I really don't wanna do more damage I see from the bios that my CPU core voltage is 1.624V I tried lowering it to 1.3V but my PC wasn't displaying anything and I just removed cmos and it got fixed but the temps are still the same so if you can assist me with this please I got it to a specialist he made my temps to 33 C but I was getting blue screen of death .

[KLOMBT]

CPU core 1.620 CPU aux 1.820 CPU sa 0.796 CPU vdd2 1.124 idk if this help with you understanding my problem but this the values