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CPU temp not lowering after thermal paste was replaced

Last response: in CPUs
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May 27, 2013 3:35:45 PM



Hello Tom's hardware community, I have a question regarding the CPU heating up higher after I applied thermal paste.

I wanted to clear a lot of dust out of my computer, I accidentally removed the heat sink and fan off the CPU when I originally just wanted to remove the fan. Hear the noise as the heat sink and CPU separated and nearly browned my pants. Didn't use my PC too much for the next couple days and finally got a hold of some Silicone Base + heat sink compound.

I tried applying the compound by smearing a layer over the entire CPU and attaching the Heat sink, didn't lower the heat.

I removed the compound and cleaned the parts, tried to reapply the compound a 2nd time by using the drop of a pea / grain of rice and it's still not lowering the heat temperature.

When my PC was "dusty" on the inside it had an average of 40-48'ish C, I checked in the bios before I tried to do anything with it and it claimed 33C before it booted the operating system.

Now that I cleared the dust out and attempted to reapply thermal paste I get an average CPU temp of 45c - 55c which is much higher than I originally had while it was full of dust, currently the bios still says it runs the same 33C or so before it boots an operating system then while the OS is up and running I get about 50C on average for lowest temp and it runs on 55C often.

I have included a picture that shows the current heat levels and then another picture that shows my hardware in case that is required.

http://i40.tinypic.com/bee9gi.jpg

http://tinypic.com/r/ibmk2c/5

Thank you for your time, Jason.
May 27, 2013 3:47:24 PM

Did you clean off the old paste thoroughly before you applied fresh? Also, depending on the type of paste you used, your temps may vary. Paste needs to cure for best results. Some cure in 48 hours while some cure in a week.
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May 27, 2013 3:49:11 PM

First check to see if your heatsink it secure. It shouldn't be lose. This is a socket 775, thus it will use a 4 pushpin type connections or it will mount with screws. If it's said pushpins, those notorious for not connecting fully and giving you higher temps. They should lock into place and not wiggle. If they wiggle, keep trying until they don't.

You didn't mention cleaning off the old thermal paste. Make sure you did. Use alcohol and a q-tip and remove any lent that might have been left behind. You want to use a very thin amount of paste barely covering the CPU.

Lastly your temps are not that bad. They are a touch high for ideal. Not great but nothing to worry about yet. Put it under some stress and see if it shuts down. Download prime 95 and run that for a few mins with your temp monitor up.
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May 27, 2013 4:01:23 PM

timinator said:
Did you clean off the old paste thoroughly before you applied fresh? Also, depending on the type of paste you used, your temps may vary. Paste needs to cure for best results. Some cure in 48 hours while some cure in a week.


Yes I cleaned the old paste off, I only had 50% isopropyl not 70% like I've seen others suggest. I tried looking around on the internet to see if the paste actually needs time to cure before use from that I've seen it was able to use after the application of thermal paste.

I have bottom shelf quality thermal paste it's Radio Shack Silicone base + heat sink compound, I don't have any other paste to work with.

colsanders said:
First check to see if your heatsink it secure. It shouldn't be lose. This is a socket 775, thus it will use a 4 pushpin type connections or it will mount with screws. If it's said pushpins, those notorious for not connecting fully and giving you higher temps. They should lock into place and not wiggle. If they wiggle, keep trying until they don't.

You didn't mention cleaning off the old thermal paste. Make sure you did. Use alcohol and a q-tip and remove any lent that might have been left behind. You want to use a very thin amount of paste barely covering the CPU.

Lastly your temps are not that bad. They are a touch high for ideal. Not great but nothing to worry about yet. Put it under some stress and see if it shuts down. Download prime 95 and run that for a few mins with your temp monitor up.


the heat sink uses screws to hold inplace so it's not wobbly or any sort, I realize they are within capable range for heat it's just not sitting well with me that the average CPU temp rose 15C after I cleared off the dust and put paste on.

Should I clean it all off and attempt a 3rd paste? I guess I could let the computer sit for 48 hours after that and see if there's any changes.

I've done a stress test through everest ultimate and it was showing temperatures in the 44C area during the 15+ minute stress test so I just don't know what program to believe anymore

http://tinypic.com/r/e04jep/5
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May 27, 2013 4:10:53 PM

The three things you listed don't at all relate to your temps being this high. You don't need time to let it cure, better than 50% alcohol, or low quality paste.

This now has to be your fan(it spinning to slowly, could be going out but they get loud or stop before they go out), or your heat-sink connection. I've seen it countless(commercial pc shop repair) times, first time users not connecting the heat-sink all the way and having higher than normal temps or shutdowns under load.
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May 27, 2013 4:15:55 PM

Use prime 95 for the stress test and realtemp for the temp. Those are legit and all you need. Both are linked from techpower.
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May 27, 2013 4:18:02 PM

colsanders said:
The three things you listed don't at all relate to your temps being this high. You don't need time to let it cure, better than 50% alcohol, or low quality paste.

This now has to be your fan(it spinning to slowly, could be going out but they get loud or stop before they go out), or your heat-sink connection. I've seen it countless(commercial pc shop repair) times, first time users not connecting the heat-sink all the way and having higher than normal temps or shutdowns under load.


It's highly possible it could be the fan, it has been rather loud lately. I guess I'll have to buy a replacement fan I don't get any money until 3rd of next month. I really don't think it's the heat sink not being placed properly, it screws into place so that kinda rules out misplacement doesn't it?
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May 27, 2013 4:23:22 PM

Yes it does.

If that system stability test is accurate which it very well could be everything is fine. Realtemp and Prime95 though are known and reliable every time. You run prime 95 once realtemp is up and going, it will put your cpu at 100% and realtemp will show us its temp.

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May 28, 2013 1:48:56 AM

http://oi39.tinypic.com/237j2d.jpg

there are the results from your preferred programs when it comes to stress tests.

max temp is 55 which is nothing new from which the other program suggested,

With out the stress test it shows minimum 39C to maximum 42C and the distance to TJ max is 50-51.
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