Higher temps after delidding

BlueWeasel

Limp Gawd
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Feb 27, 2006
Messages
458
My current setup is a 4790K running at 4.7ghz (1.27v) cooled by a Thermalright True Spirit and 2 x 140mm fans (push-pull).

With this setup, I was getting temps greater than 80C during Prime95 testing. I delidded the 4790K, reapplied Noctua NH1 between the die and IHS, as well as between the IHS and heatsink. Initial tests looked good after the delid, with max temps dropping 70-72C...almost a 10C drop.

Now a week later, I ran the same test and the temps on cores #2 and #3 shot up to 85-88C! I'm seeing a huge variance in temps:

Core #1 70C
Core #2 87C
Core #3 88C
Core #4 82C​

I did everything by the book and didn't apply much thermal paste. Prior to delidding, the variance in temps was much less and they were all within a few degrees of each other.

Any idea as to the problem? I'm guessing a gap between the die and IHS. Maybe I didn't put enough TIM, as I put much less than the original Intel material.
 

BlueWeasel

Limp Gawd
Joined
Feb 27, 2006
Messages
458
I kinda get the feeling that the IHS isn't exactly flat and I didn't use enough TIM between it and the die. To be honest, I applied using the "pea method" and only put slightly more than what is recommended for typical (non-delidded) applications.

I'm considering getting some CL Ultra or Pro to try. However, it's a really thin material so wouldn't there still potential for gaps between the IHS and die?
 

arestavo

[H]ard|Gawd
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Mar 25, 2013
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CL ultra/pro are metal based (conductive, and probably not a good idea to use) and dries out in 8 to 12 months.

I'll never use that garbage again after having it dry out on both my laptop's CPU/GPUs and my desktops CPU. And you are forced to sand it off to apply new TIM.
 

alxlwson

You Know Where I Live
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Aug 25, 2013
Messages
7,718
CL ultra/pro are metal based (conductive, and probably not a good idea to use) and dries out in 8 to 12 months.

I'll never use that garbage again after having it dry out on both my laptop's CPU/GPUs and my desktops CPU. And you are forced to sand it off to apply new TIM.

Dude.. These are the BEST to use for delid. A small piece of electricians tape over anything worrisome does the job!
Dry-out is not supposed to be a concern. I had the stuff on my 280x for over two years with no issues, same goes for my fx8320
 

alxlwson

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The big thing is making sure your IHS doesnt slide around when pulling the clamp down. Did you take caution with that, and also make sure you got all the glue off?
 

arestavo

[H]ard|Gawd
Joined
Mar 25, 2013
Messages
1,665
Dude.. These are the BEST to use for delid. A small piece of electricians tape over anything worrisome does the job!
Dry-out is not supposed to be a concern. I had the stuff on my 280x for over two years with no issues, same goes for my fx8320

You got lucky then, because it dried out in 4 separate applications in under 1 year for me. It would not have been a big deal except for the higher temps and having to sand it off to apply a different TIM.
 

BlueWeasel

Limp Gawd
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Feb 27, 2006
Messages
458
The big thing is making sure your IHS doesnt slide around when pulling the clamp down. Did you take caution with that, and also make sure you got all the glue off?

You know, now that I think about it, I think I let the IHS slide when I clamped it down. I'm confident it's not a problem with the glue on the PCB or any leftover gunk.

We leave for vacation tomorrow but will remount it next weekend. I'll let you know how it goes. Thanks all for the advice.
 

alxlwson

You Know Where I Live
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Aug 25, 2013
Messages
7,718
You know, now that I think about it, I think I let the IHS slide when I clamped it down. I'm confident it's not a problem with the glue on the PCB or any leftover gunk.

We leave for vacation tomorrow but will remount it next weekend. I'll let you know how it goes. Thanks all for the advice.

Absolutr! Enjoy your time off :)
 
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