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CPU overheating out of nowhere

post #1 of 24
Thread Starter 
So a week or so back I went ahead and lapped my CPU and heatsink and switched to CooLabratory Liquid ultra. It worked out really well with a temp drop of around 10-20°c. I was able to squeeze about .4-.6 GHz extra and was able to run 4.7 GHz without thermal throttling on prime95 torture test, and dropped down to 4.4GHz for daily use.

Fast forward to today I went to add a couple of extra 200mm fans to help with my temps, but oddly enough after adding them, when I launched prime95 I noticed my CPU was really hot and throttling down to ~3GHz. Never even touched the cooler since I lapped it along with the CPU and applied the liquid ultra. Figured maybe I disconected the CPU fan by mistake, or that some other fan just wasn't working, but after triple checking, everything was still working great. Figured at that point maybe it was my overclock and somehow the voltage got boosted, but nope, same exact values. Went ahead and bumped my clock and voltage down a bit anyway, but still thermal throttled to ~3.2GHz. Figured maybe the new fan setup somehow messed up the airflow and went back to the old setup with the extra fans removed, but still curiously high temps and lots of throttling (slightly less throttling with the extra fans).

Any idea what could be causeing this? Ambient room temp was a few degrees higher than when I first tested last week, but not by very much, running max AC right now to try and see if that helps in any significant way.
Edited by Oleh - 10/19/17 at 8:38pm
post #2 of 24
Did you check the CPU if CLU is still there?
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Ishimura
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post #3 of 24
Thread Starter 
Quote:
Originally Posted by ZealotKi11er View Post

Did you check the CPU if CLU is still there?

Doubt anything could have happened to it since it was burned in and working consitantly for atleast several days, but I'll double check in the morning anyway.
post #4 of 24
Quote:
Originally Posted by ZealotKi11er View Post

Did you check the CPU if CLU is still there?
Sounds like heat is not moving form CPU to cooler. You say case fans are running the same, cooler fan/s are running the same, overcock is the same, so most likely suspect is TIM seat. I would do is remove cooler and re-seat with new TIM. I would use normal TIM. The difference between liquid metal TIM and normal TIM is about 2c .. and the next 30+ TIMs are all within 2-3c of each other. I don't think the expense, and hassle of trying to get a good seat with liquid metal TIM is worth it for 2c lower temps. To me it's time better spent optimizing case airflow so the air going into coolers is only 2-3c above room ambient .. and many cases' supply air 10-20c warmer than room under load .. and very degree warmer the air is translates into a degree hotter the component is. If you are interested in case airflow there is a link to 'Ways to Better Cooling' in my sig below. 1st post is index, click on topic to see it. 5th is a good place to start.
post #5 of 24
Did you use CLU on your heatsink?
I can't tell from your phrasing, but if you did I read its not recommended due to corrosion or something with aluminum

Edit: Oh scratch what I wrote, I see now your heatsink has a copper base - silly me!
Edited by misoonigiri - 10/20/17 at 4:05am
post #6 of 24
Quote:
Originally Posted by Oleh View Post

Doubt anything could have happened to it since it was burned in and working consitantly for atleast several days, but I'll double check in the morning anyway.

CLU will harden out if it's used on the IHS and touching copper
Since you lapped the IHS as well you have 2 copper surfaces touching?

That's not a problem per sé as heat transfer is the same

However if you ever so slightly bumped the cooler (or moved the case) the bonding (hardened CLU) might've broken and heat transfer got kicked in the balls


I'd try to remove the cooler, clean it up proper (which might not be easy, the metal scrubbing pad that should've come with the CLU is you're friend here) and try either again or another high end TIM that is not a LM like thermal grizzly products (kryonaut, aironaut)

At least that's my guess here if you used a Liquid Metal on the IHS that it hardened and the bonding broke because the case moved or the cooler got a bump or something


Btw
The lapped copper surface will have reacted with the CLU, the staining should not have a negative impact
Edited by peter2k - 10/20/17 at 3:59am
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post #7 of 24
Quote:
Originally Posted by misoonigiri View Post

Did you use CLU on your heatsink?
I can't tell from your phrasing, but if you did I read its not recommended due to corrosion or something with aluminum
What peter2k said.

Who are you asking? It helps to quote post so we know who question is directed at.

CooLabratory Liquid ultra is a gallium based TIM and gallium does not play well with many metals .. especially aluminum and to a lessor degree copper. It is also hard to spread and hard to get a good seat.
A good name brand TIM is much lower priced, much easier to work with and infnitely easier to get a good seat.
For me the potential problems far out-weight the potential of 2c or less better heat transfer it can provide with a good seat.

You might find the below link to TIM comparison graphs of interest
http://www.overclock.net/t/1491876/ways-to-better-cooling-airflow-cooler-fan-data/0_20#post_22646705

And this guide to TIM application and seating
http://www.overclock.net/t/1491876/ways-to-better-cooling-airflow-cooler-fan-data/0_20#post_22335323
post #8 of 24
Quote:
Originally Posted by doyll View Post

What peter2k said.

Who are you asking? It helps to quote post so we know who question is directed at.
Hi doyll, sorry there I was actually asking Oleh - but that's before finding out his cooler has a copper base, so nevermind my post smile.gif
post #9 of 24
Thread Starter 
I re-checked and everything and re-seated the heatsink with heat to melt the gallium like I did last time, still looks great, a nice even thin layer tacked across the entire IHS and heatsink base, not a single copper spot showing. I tested the CPU and Heatsink afted I lapped them to make sure they were completely flush when mounted and it checked out, much better contact than the concave mess I was dealing with before. I used brand new unused flat stones that I also prepped with eachother to make sure they were 100% flat, and took my sweet time making sure everything was perfectly flat. As I said, have already been runnin it for several days successfuly with very significant temp drops.

Also left the room the PC is in to cool down overnight with AC on, and was able to keep it from trottling as much, but even at 4.2GHz I was still getting some throttling.

Can't for the life of me figure out how I was geting 4.7GHz stable for several days, and all of a suddenly throttling at 4.2GHz and much lower voltage. It was only after opening up the case and adding the new fans that this happen (though its also happening with the old config now)

Also, as I said, I got very significant temp drop from the CLU, I know how to apply it properly and get it to tack to the heasinks and use heat to seat them, and I have no issue taking the extra time to do so or paying extra.
Edited by Oleh - 10/20/17 at 9:29am
post #10 of 24
Quote:
Originally Posted by Oleh View Post

I re-checked and everything and re-seated the heatsink with heat to melt the gallium like I did last time, still looks great, a nice even thin layer tacked across the entire IHS and heatsink base, not a single copper spot showing. I tested the CPU and Heatsink afted I lapped them to make sure they were completely flush when mounted and it checked out, much better contact than the concave mess I was dealing with before. I used brand new unused flat stones that I also prepped with eachother to make sure they were 100% flat, and took my sweet time making sure everything was perfectly flat. As I said, have already been runnin it for several days successfuly with very significant temp drops.

Also left the room the PC is in to cool down overnight with AC on, and was able to keep it from trottling as much, but even at 4.2GHz I was still getting some throttling.

Can't for the life of me fogure out how I was geting 4.7GHz stable for several days, and all of a suddeen throtling at 4.2GHz and much lower voltage. It was only after opening up the case and adding the new fans that this happen (though its also happening with the old config now)

Also, as I said, I got very significant temp drop from the CLU, I know how to apply it properly and get it to tack to the heasinks and use heat to seat them, and I have no issue taking the extra time to do so or paying extra.

Did you read what I posted and look at links I suggested after quoting and asking misoonigiri who the question was directed at?

You go from unlapped to lapped CPU and cooler base using normal and probably an old TIM install to a lapped base and cooler with near perfect mating and then calim " very significant temp drop from the CLU". Reality is the lapping and mating of surfaces is the real reason temps dropped, not the CLU. Sure, the CLU contributed about 2c, maybe up to 3c, maybe less then 2c of that significant temp drop. We really have no idea how much of the difference CLU made versus how much of the difference is lapping and matching the surfaces because you did not test with normal TIM to know how much difference the lapping made.
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