[CUBE] Giga Upgrade/Thermal paste/Sleep

[Martin Weiss]

	As I understand the Giga Upgrade processor has some material 
on it that "melts" to form a conductive seal. So it is not clear what 
an adhesive would accomplish. Has anyone checked with them?

Martin

  >As an electrical engineer who designs systems for space, I have to 
design boards for conductive cooling, and one thing I can tell you, 
thermal paste will greatly improve the thermal conductivity between 
two plates.  If you take two plates, no matter how carefully you 
machine them for smoothness, you'd find that they are very rough 
microscopically, in fact they would only touch in a few places across 
the entire plate.  The only place that the two plates make good 
conduction is directly under the screws holding them together.
>   The temperature of an electronic part is equal to the power 
>dissipated by the device times the thermal resistance of the cooling 
>interface.  The thermal resistance is inversely proportional  to the 
>area of the interface.  In other words, by not using thermal paste, 
>you reduce the thermal interface to just the area around the screw 
>holes, increase the thermal resistance, and make the CPU run hotter.
>   This would however not make the cooling fins any hotter, just the CPU.
>A good book on this subject is "Thermal Computations For Electronic 
>Equipment" by Gordon N Ellison
>Bob.
>
>----------------------
>
>Robert W. Bumala
>Circuit Design Engineer Staff
>Lockheed Martin Advanced Technology Center
>
>Lockheed Martin Space Systems Company
>Org. L9-42  Bld. 255
>3251 Hanover Street
>Palo Alto, CA 94304-1191
>
>Phone: (650) 354-5918
>Fax:      (650) 424-3333
>EMail: Robert.W.Bumala at lmco.com
>
>  -----Original Message-----
>From: 	Cube List [mailto:Cube at lists.themacintoshguy.com]  On Behalf 
>Of Laurie A Duncan
>Sent:	Wednesday, November 26, 2003 8:02 PM
>To:	Cube List
>Subject:	Re: [CUBE] Giga Upgrade/Thermal paste/Sleep
>
>On 11/26/03 10:34 PM,"Anthony Kulesa" <tmandesign at mac.com> typed the
>following:
>
>>  A comment from "Cube Guru" about thermal paste can be found here:
>>
>>  http://www.cubeowner.com/forums//index.php?
>>  s=ec921d147e84520a154e1df8daa8455b&showtopic=4179&st=40
>
>I believe the specific post you are referring to is by Straker, and it can
>be found here:
>
><http://www.cubeowner.com/forums//index.php?showtopic=4179&view=findpost&p=2
>7887>
>
>PS - "Cube Guru" is a title assigned to members based on number of posts :)
>PPS - if you click "Posted", next to the date/time stamp at the top of every
>post, it pops up a window that tells you the exact link to that post!
>
>Hope this helps!
>
>Laurie
>--
>Founder, Editor, FAQ-checker
>http://www.cubeowner.com
>Home of The Mac Cube FAQ!
>AOL IM/iChat: cubeownernyc
>
>
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-- 
Martin Weiss, Ph.D.
Director of Science
New York Hall of Science
47-01 111 th Street
Corona, New York 11368
phone: 718 699 0005 x 356
facsimile:718 699 1341
mweiss at nyhallsci.org
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