Having problems with your Dell Dimension 8400 PC Desktop ?

Dell 8400 heat sink / fan issue

\015 After much research I realized that my Dell 8400 fan was running at extreme speeds related to a heat sink issue. I also found that many people have changed the heat sink, and the issue returned. One person seemed to be successful and I thought maybe it was how the cleaned the heat sink and the way and type of paste they applied when the replaced the heat sink. There were also people who replace the motherboard and CPU, but no one seemed to have the best solution.\015\012Besides an opinion on the solution, I am very much interested in finding the best product to clean the sink contact, and best paste to produce the best contact.\015

Answers :

You can find professional cleaning solution products at any good computer parts store, or you can rubbing alchohol (the less water content the better) use a lint free cloth like the kind to clean eye glasses.

In my opinion the best thermal paste is Arctic Silver
Ok just sharing some info. Some design of m-board is design that cpu fan is controlled via motherboard sensor and software.

For good dissipation of heat, some tips are based true experiences, like the way the thermal compound is being applied, the brand of thermal compound, size of the heatsink, fan, and the overall air system of the cpu case.

As for applying of thermal compound an enough amount to cover the processor surface the one that contacts with the heatsink(commonly the one on the center). Too much or too less is not good.. Nano silver and brand is important too.

Some use aftermarket CPU cooler. And the way the airflow on the CPU case. Exhaust on the upper(says that hot air is commonly on the upper) and intake on the bottom( cool air tends to be on the bottom portion). Additional case fan to be added.

And also how you clip the heatsink on its place. It must be level of parallel to the surface of the processor.

And maintenance issue, clog heatsink and dirty fan blade.

Hope this helps.
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