10900K oc

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Merry Christmas to all
hope my post finds you all well with this covid thing around.
I have been looking to this forum but now i am lost so i had to sign up and make my questions.
I recently jumbed from 9900K + Aorus Master to 10900K + MSI Z490 Ace.
The 10900K i received was used because i found thermal paste residues on it.
Before i sent it back i said to try and see how it performs. I have to say that i am new on oc and dont have much experience.
I got a custom water loop (480) just for the cpu.
I tried 5.1 with 1.28v LLC2 (1.31v max at hwinfo) and tried prime95 small fft. After 2h 4 threads stopped and max temps went up to 90*C.
Is this normal? Should i try again? Resit my cpu block maybe? Or just sent it back and get another chip? Realbench dont have any issues running 5.2Ghz 20 loops, max temps 75-80 i think
Thank you in advance
 
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Do you have AVX enabled on prime95? It defaults enabled.. Running these CPU instructions will produce a significant amount of additional heat and prime95 runs them so intensively that the only real world comparison is going to be research applications like protein folding, etc. For that reason, a lot of OC experts advise disabling the setting (buildzoid notably included) as the vast number of users arent ever going to run their chips in this manner in real world applications.

Sounds to me like you have it enabled, and the extra heat is saturating your reservoir. That still takes 2.5 hours apoarently, do really not bad at all. For comparison ive got a D15 cooled 10900k and I can only run AVX small FFT for about 30 minutes at light overclocks before I start to throttle.

Before you decide to return your chip (very strange it was used if you werent buying from a third party??), go into the bios and poke around in the menus for the voltage to frequency ratio graph. This data shows the chip's thermal wall as the minimum voltage increases to provide an increasing frequency. I've got an absolute garbage chip where the exponential curve breaks upwards just after 5.0 Ghz. Basically means that the voltage demand is so high at this point, any higher OC will overheat the chip almost independently of cooling (obviously extreme LN2 is going to give more gains than air). If your curve breaks upwards later, like 5.1 or 5.2, then there's not much reason to switch out provided all your cores are functioning properly. You could just as well lose hard on the lottery like I did, where I am stuck at 5.0.
 
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I am pretty sure that this cpu was used before. The weird is that the shop from where i bought it is one of the most known shops here. And their shops are closed due to lock down almost 2 months now. So either the cpu has been installed on a pc build which has been cancelled or someone has a gooooood friend on the shop warehouse. I am pretty sure it had thermal paste residue on it since it left marks on my fingers.
I tried to find that graph but no luck....
Yea i had avx on, tried small fft with L1 L2 L3 and avx on.
You are right maybe i ll geshould consider keep it and try once more with 1.29v or 1.285v and see what will happen?
I dont really care so much about the oc, but it would be nice for once to achieve a good oc... just for my ego.

Edit
I am trying again with 1.29 and ac on xD
20mins now max temp 88 will try get 8h.. it should be ok or not
 
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The Intel packaging is tamper proof and has several seals that would indicate it had been opened. They dont package food or medicine this securely.. if your chip didnt come in the triple blue cubes then you don't have original packaging and you should return it immediately because A) your warranty isnt valid and B) who knows what the previous user has done.
 
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Box had 2 seals on bottom. One was opened but not cutted, the 2nd one was really easy to open without brake it...
outside of the box, the cpu inside that plastic protective box, had obvious 2 vertical signs like scratches, but i thought are marks on the pastic cover.
As for the one opened sealed i thought from humidity or something...
but when i took the cpu out while i was ready to install it to my mobo, i saw thermal paste residues on my fingers... and the 2 scratches from the cpu almost dissapeared.
But if the chip isnt bad i dont really care since warranty is there ... but is it?
 
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I would want to make sure of that. But yeah, if the chip runs well (and you arent overvolting it yourself), might not be such a big deal.

The voltage/freq graph is hidden in a sidemenu on one of the last tabs in the Asus bios, probably similar in your bios. Worth finding it.
 
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i will try again to find it (if msi has one)
Just finished 2.5h prime95 @5.1Ghz with no avx offset without any issues. 1.285v max temps 88 but mostly around 83*C max.
I am trying realbench now
 
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