My friend just blew up his 9900k

[Turtle Rig]

Just now, Rigg said:

Yeah my chip is weird. It hits a bit of a wall with temps over 5 ghz. I can run it there at 1.24 (under load reported by HWI64 1.265 in bios) and it doesn't even go above 80c peak with small FFT. I can hit stock all core under 1.1. I'm pretty sure it would do 5.2 all day with a custom loop. I'm not willing to spend $500 + to find out. It's overkill for me anyway. I listed the whole rig sans GPU on CL. 

Ya dude if someone can tell the difference between 5Ghz or 5.2Ghz then it would only be on a benchmark.

[StarsMars]

9 hours ago, Rigg said:

There is no real benefit to 5.2 except for bragging rights. Mine hits 5.1 at 1.325 -1.36 depending on the mobo and I can't keep it under mid 90's on a 360 AIO with prime 26.6 small fft at those settings. 

. 

 

9 hours ago, Turtle Rig said:

That is insane my friend.  90's c wtf with liquid cooling doesn't sound right.  But I do know synthetic bench or stability test like Prime95 is not a good idea to run.  It stressed the CPU in a way it will never get stressed in the real world and the temps are 10c high then AIda64 stability test,,, trust Aida and don't run Prime95 and abuse the CPU ya know.  As long as your 70's c in game then that's impressive.

Is the 9900k a good candidate for a delid?

 

hows the tim?

[Turtle Rig]

23 minutes ago, StarsMars said:

 

Is the 9900k a good candidate for a delid?

 

hows the tim?

Nope! you will have to sand as well and your really risking the CPU.  The IHS is better then previous Intel sh*T so leave it alone.  Just get good cooling on it and your set.

[Falkentyne]

10 hours ago, Dabombinable said:

It does when Intel spec the VID right up to 1.5V...meaning that it can be an acceptable voltage to run at. As long as Intel says it is.

Acceptable voltage?  You have no idea what VID is or how it works with loadline, do you?

1.5v means ZERO AMPS going into the CPU.  Zero.

In other words, if you use ANY sort of Loadline Calibration, all bets are off.

That's why 1.404v idle at 5 ghz with Auto voltages is safe as long as you stick to all bios defaults.  185 amps will drop that 1.4v to 1.24v at full load, with AC loadline (Not loadline calibration) boosting the input voltage to the VRM slightly depending on load, to help mitigate vdroop without using Loadline Calibration.  If you try setting 1.4v manually (still with LLC set to normal or standard, which are still Intel defaults of 1.6 mOhms of VRM Loadline), your vcore will be 1.10v at 185 amps, and that won't be stable at 5 ghz.

[xg32]

i'm actually a bit surprised 1.5v is all it took, not that i'd ever run anything past 1.4 24/7, i've never even gone for 5.2 on mine, 5.3-2avx takes 1.38v and i'm not even sure it's completely stable, and i can't prime on that.

[Rigg]

The heat probably killed it. A 9900k at 5.2 with 1.5 v core (with enough LLC to maintain that overclock) would likely have had all cores at TJmax with any significant load. The d15 is good but not that good. I've never done anything that stupid but I'm pretty sure it would only clock itself down enough to stay right under 100c. 

[Turtle Rig]

2 minutes ago, Rigg said:

The heat probably killed it. A 9900k at 5.2 with 1.5 v core (with enough LLC to maintain that overclock) would likely have had all cores at TJmax with any significant load. The d15 is good but not that good. I've never done anything that stupid but I'm pretty sure it would only clock itself down enough to stay right under 100c. 

Yean apparently it ran fine then suddenly died.  Sorta mysterios, but also he never told me his temps, he never uses temp apps.  He just set it and forget it and this is what happens.  I don't think Intel will RMA it and say he botched the CPU.

[asand1]

12 hours ago, Turtle Rig said:

  I don't know how intel is on RMA, but will they cry out foul play and say he abused the chip or something ?

Well, they wouldn't be wrong. Your friend did it himself.

[Dabombinable]

3 hours ago, Falkentyne said:

Acceptable voltage?  You have no idea what VID is or how it works with loadline, do you?

1.5v means ZERO AMPS going into the CPU.  Zero.

In other words, if you use ANY sort of Loadline Calibration, all bets are off.

That's why 1.404v idle at 5 ghz with Auto voltages is safe as long as you stick to all bios defaults.  185 amps will drop that 1.4v to 1.24v at full load, with AC loadline (Not loadline calibration) boosting the input voltage to the VRM slightly depending on load, to help mitigate vdroop without using Loadline Calibration.  If you try setting 1.4v manually (still with LLC set to normal or standard, which are still Intel defaults of 1.6 mOhms of VRM Loadline), your vcore will be 1.10v at 185 amps, and that won't be stable at 5 ghz.

Even back in 2007 with the Q6600 (binned far lower than the QX6850), people were fine with 1.5V 24/7, as long as they had adequate cooling. That's the 65nm node for you. Don't forget that as the nodes get smaller, voltages get lower. Some people even had the Q6600 at 1.6V for over a year without problems.