Pre and Post Arctic MX-4 Thermal Paste Questions

retsanem

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Mar 25, 2015
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Questions:

Why am I NOT seeing dramatically reduced CPU temps post Arctic MX-4 TIM?

What criteria, e.g. CPU temp should I use to change the thermal paste?

I have two custom built computers, ASUS motherboards, one i5-2500k and the other i5-3570k with Hyper 212 EVO heatsink and el-cheapo thermal paste, all set up in 2012 and 2013, respectively. I run only in turbo, non-overclock mode. ASUS says that maximum CPU temp for the i5-2500k is 72.3' C, unknown for the i5-3570k

I run a Noctua rear-pull fan set up with both. My CPU temps per RealTemp are in the 40' C range. They seemed to increase from the 30'C range 2 years ago, with the i5-2500K running about 5-10' C hotter, After reading about TIMs and Arctic MX-4, I decided to change the TIM. Tonight, I just changed the TIM without problems on either computer. The i5-3570K thermal paste completely covered the CPU top. The i5-2500k only covered about 80%, missing an l-shaped corner. I was generous, but not silly, adding Arctic MX-4 this time.

Thanks!
 
Solution
clean the cpu/cooler surface with rubbing alcohol, they should shine like mirrors

too much TIM can act as a blanket. less tends to be more. use a small bead in the middle of the cpu. don't spread it. the pressure of the cpu cooler will spread it just fine. don't rock the cooler. rocking the cooler adds airbubbles to the TIM which also acts like a blanket. Most TIM has a burn in period where heat+time lets it set in.



clean the cpu/cooler surface with rubbing alcohol, they should shine like mirrors

too much TIM can act as a blanket. less tends to be more. use a small bead in the middle of the cpu. don't spread it. the pressure of the cpu cooler will spread it just fine. don't rock the cooler. rocking the cooler adds airbubbles to the TIM which also acts like a blanket. Most TIM has a burn in period where heat+time lets it set in.



 
Solution


Because there was nothing wrong with what you had before.



When there is none already applied to the heatsink or you have to remove the cooler for some reason and needs reapplication.

For the most part using an expensive paste has no real benefit over pre-applied paste from a third party cooler. Typically the difference is minimal. Here are some links from this very site to help you out in the future:

http://www.tomshardware.com/reviews/thermal-paste-heat-sink-heat-spreader,3600.html
http://www.tomshardware.com/reviews/thermal-paste-performance-benchmark,3616.html