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"Conor" wrote in message
... In article , says... What exactly is the problem if too much cpu compound is put on the core and it gets squashed out onto the surrounding area? Apart from looking messy, is there any real problem with this? Yes as it acts as an insulator. But more conductive than air, which is why it is used. Alex |
#13
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"QBall" wrote in message ... You don't say why it's inefficient ! Do you mean wasteful or something else constituting inefficient. A vague and meaningless answer. He means heat transfer will not be as good due to the large gap between the core and the heatsink (I think large is a good word because much of this is discuss'd on a "microscopic level" |
#14
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Rob Morley wrote:
Yes as it acts as an insulator. The idea of thermal compound is to fill the very small scratches on the faces. Actually the thermal paste is non-conductive. Eh? You thought he meant thermally, we realised he meant electrically. I realised he could have meant either, so asked for elaboration. Actually some thermal compund is electrically conductive too, Which one? so I think it was a dangerous statement to make. |
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#17
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CrackerJack wrote:
What exactly is the problem if too much cpu compound is put on the core and it gets squashed out onto the surrounding area? Apart from looking messy, is there any real problem with this? You'll always get a little but if you are squeezing a lot out it indicates you've applied far too much, meaning the layer of paste between the processor die/heatspreader and heatsink is too thick. Remember, the idea is NOT to form a layer between the two surfaces. The purpose of the paste is to fill the valleys in the contact surfaces with something which is more efficient at transferring heat away from the CPU core than the air which would otherwise fill the gaps. Even the best thermal material is less efficient than direct contact between the two metal surfaces. Also, some thermal materials can be slightly electrically conductive, so if leaks out and bridges gaps in electrical contacts it is possible that it will result in reliability problems or even permanent damage to components. -- iv Paul iv |
#18
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"Rob Morley" wrote in message t... In article , "Piotr Makley" says... Rob Morley wrote: What exactly is the problem if too much cpu compound is put on the core and it gets squashed out onto the surrounding area? Apart from looking messy, is there any real problem with this? Only if it's electrically conductive, or if there's so much that it actually holds the heatsink off the CPU. But why not just put a reasonable amount on in the first place? It is hard to judge the exact amount. Rather than put too little on and run the risk of not conducting heat away from the core, You clearly have no understanding of thermal transfer, which is maximised via metal-metal contact. You fall into the ingenue's trap of believing more is better, when it fact less is more. I usually err on the side of putting too much on. If you're not sure then try with a very small amount, remove the heatsink again and see how it's spread. Then clean and repeat. If you don't clean it off in between applications there's more chance that you will trap air in the compound. |
#19
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#20
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In article ,
says... Conor wrote in message m... In article , says... What exactly is the problem if too much cpu compound is put on the core and it gets squashed out onto the surrounding area? Apart from looking messy, is there any real problem with this? Yes as it acts as an insulator. The idea of thermal compound is to fill the very small scratches on the faces. Actually the thermal paste is non-conductive. I MEANT HEAT INSULATOR.... For the love of God... For maximum heat transfer from the core to the heatsink, the two metal pieces need to touch as much as possible. Hence, the addition on the paste fills in the imperfections. Other than being a mess, things should work just fine. And too much paste prevents one metal surface having contact with the other thus INSULATING IT whether electrically or thermally. -- Conor If you're not on somebody's **** list, you're not doing anything worthwhile. |
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