OC'd a 4690k @ 4.5 GHz passes AIDA64 test, but Linx test fails instantly

Elnezest

Commendable
Dec 15, 2016
2
0
1,510
Dear fellow overclockers,

I need your help (obviously)

I am quite new in this overclocking business but I recently bought a 4690k and I thought I will give it a go.

First I scrolled through this forum and managed to collect some general information and basics about my chip and about OC'ing in general.

After installation I managed to raise the frequency to 4.2 with leaving VCore at 1.2V. I also dropped Uncore to 3.3 at 1.05V as was one of the suggested things to do.
Also have tried 4.4 and 4.3 but Windows didn't boot up and it had stability issues respectively, so I went back to 4.2.

Life was good, have played few demanding games most of them on very high or sometimes on ultra but after a month or so I thought that I would like to know if I can push this chip a little bit further (as you do). Especially after I noticed some lag while playing GTA V (rural areas).

So, I came back to read some more about the topic, and after some experimenting I have done the following:

Set core multiplier to 45 and VCore to 1.265V, and raised Uncore to 40 at 1.195V

Boot up properly, run AIDA64 test for an hour, no problems. Temperature between 65 and 75 during test. So far so good, right?

Started a game, no crash, things looking fine.

Then I have tried Core at 46. Boots up with VCore at 1.28V but BSOD after a minute of AIDA64 test. Temperatures were okay.

Then raised to 1.3V with same results.

So I went back to Core at 45 with VCore at 1.265V to my last stable setup.

Then I installed Linx to run some serious testing, just in case.

As you can expect from the title, it failed. After pressing Start, the PC reboots instantly. Tried again, same happened.

So I guess my OC is not that stable after all...

What shall I do next? Anyone have any ideas what could be the problem?

Could it be the Uncore?
 
Solution
you can leave the uncore at ~39 @1.2v - it is the CPU cache.
the CPU cores are those you are playing with - core.
you can go as high as 1.4V as long as the cores temperatures are under 80C (under load).
so step by step increase voltage while staying at the same multiplier value if it's not stable.
please note, that there is a "wall". in my CPU i can easily have 4.5 at 1.29v but to get 4.6 i need to jump to 1.4v.
add more voltage :)
but really, 100MHz don't make any difference in real life usage.
Linx is more abusive than AIDA64 so you can expect that it will cause to fail faster.
Also, the CPU is not the only component that can fail.
For example, I can't run long torture tests on my system as the CPU VRM on MB is getting past 100C and eventually failing when CPU constantly consumes 130-160watt. But for daily use, there is no problem.
 

Elnezest

Commendable
Dec 15, 2016
2
0
1,510
More voltage to Core or Uncore? How high can I go? I think some people said that going above 1.3V you need to be careful. I only have a Hyper Evo 212 for cooling so I don't know how far I can go with voltage.

100MHz difference might be unnoticeable but what if my chip can do 4.7 or even 4.8 with the right settings? I don't know if it's possible but I'd like to know what is it capable of.
 
you can leave the uncore at ~39 @1.2v - it is the CPU cache.
the CPU cores are those you are playing with - core.
you can go as high as 1.4V as long as the cores temperatures are under 80C (under load).
so step by step increase voltage while staying at the same multiplier value if it's not stable.
please note, that there is a "wall". in my CPU i can easily have 4.5 at 1.29v but to get 4.6 i need to jump to 1.4v.
 
Solution

L0stChild

Reputable
Mar 8, 2016
635
1
5,165
if you want to see the potential of your cpu, you will have to upgrade your cooling to cope with the heat.
my personal experience with air cooler (be quiet shadow rock slim) i ran 4.6-4.7ghz on prime95 hitting 80's on average with a few 90s peak with one core failing. that being said, i kept my 4.6 setting for about a week and ran my games fine.
just like you, i wanted to see more from the cpu.
i then got an open loop AIO cooler and loaded up 4.7 and now running 4.8ghz @ 1.37vcore, temps below 70c on everyday uses and gaming.
when ur dealing with 4.6 and above, there are more variables that could counter your stability.
in my case my overclocks up to 4.6 i left the uncore around 39.
at 4.7 i moved it up to 46 and 47 for 4.8ghz
check your ram as well.
both ram and uncore settings can make your computer feel sluggish if they dont sync. one way i test is to right click the desktop and see if it pops up quick. then i open task manager and fast scroll down the list to see if it reacts quick.

those are my experiences and may or may not be the same for you but it could help you tinker