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I can't clean my i7!

post #1 of 9
Thread Starter 
Hi there,

I'm not sure if that's the correct subforum to post this issue.
If it's not could you please guide me to the other one?

Anyway okay, I'll try to keep it short.
I have that i7 740QM in my laptop, and been experimenting with various TIMs.
I repasted it with coollaboratories liquid ultra, with mx-2 and lately with icd7.
I've been repasting it a couple of times with each one.
And, um, I've observed degrading performance with further applications.
I think liquid ultra and icd7 made some irretrievable changes to the surface of the cpu.
It's not that I'm careless or something, I even use that 2phase cleaning k(sh)it from arctic cooling and it doesn't help.
Take a look, and please tell me if that can be the case of higher temps, also if the answer is affirmative then can I do anything?

Cheers.
post #2 of 9
Can you not scratch it off with your nail, that much wont effect the temps at all really, talking less than a 1C.

Hell when most OEMs repair laptops they don't even replace the thermal paste.
Edited by andrewmchugh - 9/17/11 at 7:55am
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post #3 of 9
I have used icd7 for my desktop; however, even though the surface of my CPU has been stained grey I haven't had any temp problems. Also getting it warm with a hair drier might as icd7 is pretty thick when its cold.
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post #4 of 9
Thread Starter 
Dudes, I repasted it many times, do you think i didn't try to wipe it off? I mean for reals, it's like I could polish it for an hour with that arctic cooling cleaning kit and nothing.

Let me try to be a little more specific.
I observe something around 2-4*C idle, and like 4-6*C stress temp difference, and I am not saying it is because of that "scratched" cpu surface. If I were sure about that I wouldn't ask. It may be because of updated bios or something.
But I've repasted it many times lately, and even got heatsink repleaced, with almost no difference, so I wouldn't say its because of poor application or heatsink.

I am asking what that grey dots are and if they can make a difference (alongside with those scratches).

Another thing is that I observed first changes after using liquid ultra, the cpu was not yet scratched, but had some strange marks that are quite hard to describe but they were not that noticeable.
But after using the icd7 cpu got scratched quite hard, and in addition, those, hardly noticeable marks from liquid ultra became grey and the outcome look like on the attached picture.
post #5 of 9
I am a computer repair tech, I work on laptops and diagnose them everyday, six days a week. I use a simple shop towel and rubbing alcohol to clean the CPU and apply normal TIM to the laptop, nothing special. These solutions or cleaning kits people market are NOT NECESSARY by any means, the end result will be the same with or without it, the CPU surface should be clean or dirt and debris. In this case, it is obvious you've done more harm than good by distorting the finish on the CPU itself, as for causing any heat issues I wouldn't expect the current condition to have any real adverse effects.

BIOs updates however can change these events as you've noticed, the BIOs update may have included different thermal/voltage/heat sync specifications which may be resulting in your current issue. If you haven't tried this yet, try reverting your BIOs to an older version, which I'm sure you can find on the manufacturers website, and try stress testing again.

Overall, thermal interface material WILL NOT make these desired changed worth while or the headache you are experiencing. I can suggest a few other things but those are highly unlikely as you've stated you haven't altered anything other than the heat sync, but the problem was once again existent before this change.

Quick process of elimination can help you solve this issue, was the issue present before or after the hardware swap?

Yes - Not the hardware
No - Troubleshoot the hardware

I would try the BIOs thing before getting yourself worked up any further. Apply a TIM to your satisfaction and call it that.. also keep in mind that the processors used in these laptops will also have a significantly higher thermal threshold than others, say desktop CPUs.
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post #6 of 9
Thread Starter 
Thank you for such rich answer, but the thing is, there are too many variables.
I got motherboard replaced 3 times, heatsink replaced 2 times, bios is at version A08, and when I bought the computer it was A02. I'm perfectly aware how bios updates can affect temps, thats why I mentioned that. Even things like gpu drivers can play a role here. That way I cannot narrow options by elimination.
And frankly, all I can ask is what are those stains on my cpu and can they decrease TIM performance?
post #7 of 9
Quote:
Originally Posted by Ciebiada View Post
And frankly, all I can ask is what are those stains on my cpu and can they decrease TIM performance?
I bought this cpu (Q6600) from the OCN market place. It can heavily stained with old TIM. I can't find the thread but, trust me, it had some old Arctic Silver fused to the ihs.

* 90% Alcohol + coffee filter + careful scrubbing = workable ihs

Not all of the old TIM came off but what was left behind was a stain of sorts and hasn't affected performance at all. Here's my temps with this thread in the background.

If I find the thread I'll edit this post so you can see that stains on the ihs aren't that bad.

Here's the thread, look at the cpu. I thought it was banged up at first but it's TIM fused onto the ihs--the cpu was a bencher. I used 90% alcohol to scrub the contacts and the ihs and it works just fine--perfectly fine in fact.

Edited by crashdummy35 - 9/17/11 at 9:27am
 
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post #8 of 9
The stains on the top of the CPU may or may not cause temperature differences depending on one thing, do they protrude from the surface? If you run your finger over the surface can you feel any defects from them?

If you can't feel anything when you run your finger over top I would say no, thermal interface material is there to help fill in microscopic scratches/defects between the CPU and the heat sync respectively. The surfaces on either are not perfectly lapped from the manufacturer so the TIM is supposed to alleviate the defects and help create the contact between the two surfaces.

TIM is also comprised of different materials depending on manufacturer, I think AS has specs of nickle in it, which of course is conductive, but also dissipates heat at a higher rate like copper or graphene.

If 1-2c idle and 2-4c under load (Whichever the differences were previous to your problem) is going to get to you that much I honestly don't know what to tell you. Something like that is very miniscule and shouldn't bother you that much It wont make or break the rig in the long run.


Also! As for what the stains are I can't really say but my guess would be from one of the many TIM compounds you have used which shouldn't be a problem.
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post #9 of 9
Thread Starter 
Well thanks for the answers. I guess there is not much more to say. The surface is flat, if it didn't I think I would scrap it off.
Your opinion guys is it shouldn't make a difference, ok, so be it.
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