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Laptop GPU.. Thermal Paste or Pad replacement ?

post #1 of 9
Thread Starter 
hello all

I disassembled my friends laptop after fixing some display issues and sound, realizing the thing was running HOT HOT HOT !!! The cpu was about 90c + with fan running on high.

Anyway.... GPU side, should i just use the existing thermal Pad or use some AS5 i have ?
Do most laptops use thermal pads on the GPU to create spacing ?

I don't think the GPU is running extra hot, but i want to make sure before i reassemble it.


I'm asking because The CPU is fine with the paste ( DUH )
But the copper Shim extends to the GPU with a thermal pad to dissipate heat and was wondering if some paste would work better.

The problem is i'm not sure it's going to make contact correctly because the pad creates space.

Anyone have experience with this ? I'm thinking GPU pads on laptops create the space between the Heatsink and Thermal paste wouldn't connect properly

I haven't disassembled many laptops so i'm unsure


thanks
Edited by OptimusPrime - 10/22/11 at 3:48pm
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post #2 of 9
I'd say yes, apply some paste to the GPU side. As you may know a GPU generates waaaay more heat than a CPU, so the added help should count for a lot if not moderately.
     
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post #3 of 9
Do a before and after test. Obvs.
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post #4 of 9
Use something aside from Arctic Silver 5 since it requires a good 200 hours to cure and is a polysynthetic Silver based compound. Meaning it conducts electricity. Use something like GC-Extreme which has no cure time, performs near the level of Shin Etsu, and isn't electrically conductive. Not to mention you can get a 3.5g tube of the stuff for like $12.

Also, which CPU and GPU is he running on the machine? And what brand is the machine?
     
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post #5 of 9
Yes the pad is what makes contact between the heatsink and gpu. Copper shim will help + thermal paste but the problem with that you have to find a near or perfect size copper shim to do that. The best way is to do trail and error test with the copper shim and different sizes.
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post #6 of 9
Thread Starter 
thanks for the responses
Quote:
Originally Posted by VastoLorde;15428867 
Yes the pad is what makes contact between the heatsink and gpu. Copper shim will help + thermal paste but the problem with that you have to find a near or perfect size copper shim to do that. The best way is to do trail and error test with the copper shim and different sizes.

Ok so i re-applied thermal paste to the CPU and it is running much cooler but it heats up quite fast. Definitely not as much as before but the GPU is at the end of the copper heatsink arm. So it goes from the GPU to the CPU to the FAN/Fins and out the back. So i could imagine the GPU is helping to heat up the CPU as it passes over it to the fan.

I'm thinking the GPU is creating allot of heat and the stupid thermal pad just doesn't do the trick as well.

I was looking at copper shims on ebay... Do they Just fit between the heatsink end - thermal paste then GPU ?? ...

I haven't used a shim but i'm thinking it goes... GPU chip --> paste-->> copper shim>-- heatsink ?

I could be wrong but either way i think it will work better than those stupid thermal pads. even though i wouldn't doubt there are better thermal pads than the stock that is on there.

thanks

MAkes me wonder how they decided to design some of these heatsinks on Laptops. Totally could have made it way more efficient without heating up more than it should. At least talking about HP here...
Edited by OptimusPrime - 10/24/11 at 2:58am
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post #7 of 9
Thread Starter 
Quote:
Originally Posted by Imglidinhere;15417053 
Use something aside from Arctic Silver 5 since it requires a good 200 hours to cure and is a polysynthetic Silver based compound. Meaning it conducts electricity. Use something like GC-Extreme which has no cure time, performs near the level of Shin Etsu, and isn't electrically conductive. Not to mention you can get a 3.5g tube of the stuff for like $12.

Also, which CPU and GPU is he running on the machine? And what brand is the machine?

thanks

it's an HP pavilion hp dv4 1222nr. IT has...

-- ati 3200 GPU and (at the end of the Heatsink arm with thermal pad)
--AMD Turion X2 RM-72 Dual-Core Mobile Processor
2.10 GHz

It still heats up way more than i would like it to. It WAS originally ramping up to 90+ and shutting the screen off before, now after disassemble/reassemble it's highest is about 75c.. 45-50c idle. Makes me wonder if the GPU working creates too much heat over the CPU .
thanks for the Paste suggestions, i'm going to check it out. 3.5 is great for good quality fast cure ! ^_^ biggrin.gif

It's amazing how much this thing likes to heat up and how many Blank screen and overheating problems HP customers complain about on Forums.

Had to do a reset procedure to get the screen to work again. Totally ridiculous. .. take out battery .. wait 10 mins .. plug in cable 2 mins.. take out... press/hold power 1 minute.. reconnect power cable without battery... restart.. insert bat. plug power.. done
ridiculous ..
Edited by OptimusPrime - 10/24/11 at 6:08pm
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post #8 of 9
Thread Starter 
***Can someone tell me how the Copper Shim's are applied ? I'm unsure as to how it works with thermal paste.*


ok EDIT figured it out. Seems past is applied, as i expected, on both sides. Copper shims seem like such a better solution to the cheap crap HP uses.
Edited by OptimusPrime - 10/24/11 at 6:20pm
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post #9 of 9
Quote:
Originally Posted by OptimusPrime;15440888 
***Can someone tell me how the Copper Shim's are applied ? I'm unsure as to how it works with thermal paste.*


ok EDIT figured it out. Seems past is applied, as i expected, on both sides. Copper shims seem like such a better solution to the cheap crap HP uses.

yup, it is a greater solution ive seen drops from different people and different computers from a drop of 2-10C. Just gotta apply the paste real good and find the perfect size.
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