Date: Sat, 9 Sep 2000 21:37:42 -0700 (PDT)
From: David Chien <[EMAIL PROTECTED]>
Subject: Re: heat problem
> > thermal grease/compound between the cpu and heatsink to ensure a solid
> Won't the decrease the effectiveness of the current heatsink
> compound? Well the little rubbery thing above the cpu and below the
It depends. The purpose of any heatsink compound/pad is ensure that there is
a wide contact patch between the heatsink and cpu that has no air gaps or
bubbles anywhere. Air is the #1 killer because it does not transmit heat
effectively and leads to a hot spot in that area.
The pad or thermal grease should not be too thick either. Both have lower
thermal conductivity than a pure metal to metal (or metal to cpu) contact, but
as we well know, it is nearly impossible to have a perfectly flat CPU top and
heatsink bottom to ensure a air free contact patch.
If the pad or layer of grease is too thick, what will happen is the same as
if there was an insulator in between the cpu and heatsink - slow heat transfer
and overheating of the cpu.
What is required in a proper installation of a pad or grease is the thinnest
layer possible that will eliminate air gaps, ensure a positive contact patch
between the two -- in thin layers, the heat will transfer through at a decent
rate and not act as an insulator.
Now, as I remember, the pad on the Libretto was smaller than the CPU, and
possibly not even. Unless the heatsink presses down on the pad sufficiently to
ensure it squishes flat and w/o air gaps, there may be air gaps remaining after
reinstallation of the heatsink. A thin coating of thermal grease to ensure
that contact occurs, and over the entire CPU top to ensure some sort of
contact with the heatsink above will increase the contact patch for the
transfer of heat, and ensure that no air gaps exist that'll prevent proper heat
transfer.
Of course, that pad may vary in size from what I remember on my L50/J, so you
should try different configurations to see what works for you. The easiest
being simply the pad and heatsink alone. Naturally, if that still results in
overheating, I'd try thermal grease.
d =)
=====
adorable toshiba libretto
The latest news and information for the Toshiba Libretto owner.
http://www.silverace.com/libretto/
__________________________________________________
Do You Yahoo!?
Yahoo! Mail - Free email you can access from anywhere!
http://mail.yahoo.com/
**************************************************************
http://libretto.basiclink.com - Libretto mailing list
http://libretto.basiclink.com/archive - Archives
http://www.picante.com/~gtaylor/portable/faq.html - FAQ
-------UNSUBSCRIBE-------
mailto:[EMAIL PROTECTED]?subject=cmd:unsubscribe
--------UNSUBSCRIBE DIGEST------
Use above but add DIGEST to the subject line...
**************************************************************
