is the 9900k or mobo defect?

[sirtoby1337]

Hi, just made a build for my friend which is:

i9 9900K
asus strix z390-i
g.skill trident z royal gold 16gb 3200mhz cl14
corsair sf750
nzxt kraken x52
samsung 970 evo 1tb
bios: 2411 (newest) - tried 2401 too..

My problem started with it crashing when doing stress testing with prime95 & intel burn test for just 5-15 mins and that was with standard bios settings..

Anyway thought well its just bad settings in the bios so i manually set the common stuff like voltage and all that and yeah 24 hrs later i havent gotten anywhere... feel like i tried everything that is possible which is trying pretty much all the guides on forums and youtube and trying from 4.4ghz to 4.9 and dif avx offsets and even going up to 1.375v on core and all kinds of power settings and nothing works it just crashes no matter what.

So i went and tried dif ram and powersupply which changed nothing either, so now im at a point where i feels like the cpu or motherboard has to be defect because normally it work with standard bios settings but this just wont work no matter what stuff i change on it.

The temperature is around 60-70c so its not the temperature that makes it crash and vrm on motherboard is at the 80c-85c.

I prob didnt write everything i did because i literally did a million things so if anyone got an idea what might get this damn build working please be so kind.

The way it crashes is that the screen just freeze and then the pc turns off totally and starts again.

When doing prime95 large test it crashes sometimes after 45 mins.. and that was with 4.2ghz on all cores with 1.25v... even 4ghz crashes at any volt pretty much.

But what is most likely 9900k being broken or the motherboard?.

 

[deustroop]

Try taking the system out of the case and running it on a cardboard surface to remove the potential for a short.
Is there a video card alternative to the igpu you can try ?
I assume the windows install is new and that the ssd tests well in CrystalDiskmark and Samsung Magician ?
Then return the board as the nest step.

 

[sirtoby1337]

Yes tested it with an evga 2080 and yes windows is all fresh and magician looks all good and nothing seems wrong there.

Can try take it out of the case but incase its not that any other ideas? is it possible the cpu really just suck at prime95 / avx tests?

Really starting to believe the VRM on the mobo is faulty and eventually gives up or that the cpu is just retarded to run anything avx related.

 

[sirtoby1337]

Tried having it out of the case and yeah same problem.. the cpu/mobo just refuse to function with prime95.

 

[sirtoby1337]

Well did some prime95 large without avx and crashed after 20 mins, so guess it has nothing to do with avx

 

[sirtoby1337]

Really wish there was a way to find out if it is the motherboard or cpu..

 

[Sgt. York]

Sometimes you have to flip a coin if you don't have test equipment.

 

[deustroop]

To test the cpu , you need another board, and vice versa. Neither is usually available so I consider which item is more likely to have a problem and which has the quickest warranty return practices.

 

[Campy]

Consider that it's very rare for a CPU to work intermittently, usually they either work perfectly or not at all. With that in mind I would think the motherboard is the issue, if in fact there is a hardware issue.

 

[sirtoby1337]

Is it possible the IMC is broken? because if i downclock the ram down to 1600mhz the pc is stable and yes i did test the same ram in my own system at 3200mhz and it works perfect there.

 

[RLGL]

Is the ram on the QVL for that board? If not try a set that is, boards are picky these days.

 

[sirtoby1337]

Yes the ram is on the QVL

 

[sirtoby1337]

Well it crashes after almost 2 hrs improvement but 1600mhz isnt an option so

 

[sirtoby1337]

Sent the cpu to intel and mobo to asus so hopefully they can explain whats wrong. shud have it back in 1-2 weeks

 

[sirtoby1337]

They sending me a new cpu since the 9900k was faulty.

Well atleast my friend can finally get his pc unless we get another faulty cpu but did talk with the place i bought it at and they said that 2.5% of all the 9900ks they sold are faulty.

 

[deustroop]

ok. That's an interesting stat.

 

[sirtoby1337]

ok. That's an interesting stat.

Ye i called proshop.dk where i bought it and they got stats on how many faulty 9900k's they get back that they have to send to intel and its around that number.

 

[VirtualLarry]

2.5% CPU's "faulty"? Seems a bit high of a percentage to me. Maybe percentage of n00bs buying expensive CPUs? (*)

(I've bought countless processors over the years, and never had a faulty one personally, though I know it can happen.)

As far as I am aware, they do test each one individually. Unless things have changed in that regard.

(*) Not meant as a slight against OP,. he just wants to get his PC built and working. I just meant "in general".

 

[sirtoby1337]

2.5% CPU's "faulty"? Seems a bit high of a percentage to me. Maybe percentage of n00bs buying expensive CPUs? (*)

(I've bought countless processors over the years, and never had a faulty one personally, though I know it can happen.)

As far as I am aware, they do test each one individually. Unless things have changed in that regard.

(*) Not meant as a slight against OP,. he just wants to get his PC built and working. I just meant "in general".

Its fine its just what the sales leader told me on phone that the fail rate is around 2.5% of 1000 cpus sold so far.

Could be its that high for other reasons that they just take the cpus in even tho it isnt broken and since its an rma it gets added as broken, but i dont know how they do it but yeah.

And they did just replace the motherboard too now and i doubt both were faulty, but im happy i can atleast pick up the new stuff on monday and hope to god that it all works this time, since the sleeved cables arrived yesterday, so the pc is ready to be 100% completed now.

 

[deustroop]

I got my magic ball out and ALRIGHT ! things look good.

 

[sirtoby1337]

Just wanna update fast that the pc finally works and it was either the cpu or motherboard that was faulty never got to know which one since they just replaced both without testing it.

 

[deustroop]

ok