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Author Topic: Where to get good thermal pads on the cheap ? (HD5970, ref design)  (Read 3923 times)
Transisto
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December 13, 2011, 05:24:16 PM
 #1

Where do you get good thermal pads on the cheap ?

60$ for a 300x200mm sheet of this http://www.ferrishield.com/pdf/TGF120K.pdf

or

http://www.frozencpu.com/products/12911/thr-100/Fujipoly_Premium_Thermal_Pad_-_VGA_Block_-_60_x_50_x_15_-_Thermal_Conductivity_60_WmK.html?tl=g8&id=KSUbVjg2
20$ shipping !

or

http://search.digikey.com/us/en/cat/fans-thermal-management/thermal-pads-sheets/1179751?k=thermal%20paDS (all shit)

or

http://www.arctic.ac/en/p/spare-parts/322/thermal-pad-accelero-xtreme-5970.html
2.51+ 4$ shipping (only for one card, maybe 2, look like crap)

or

http://www.ekwaterblocks.com/shop/catalog/product/view/id/80/category/59/  


Will edit to trim the bad choices
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plastic.elastic
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December 14, 2011, 03:06:55 AM
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The last one is thermal tape, not thermal pads.

Used chewing gum is the cheapest thermal pad. Use it.

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December 14, 2011, 06:24:48 AM
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After EXTENSIVE testing for a military application that dissipates over 2500W (Yes, 2.5KW) over an area smaller than 25 sq. Inches, I can say that the absolute best thermal material is Parker Chomerics T777
http://www.chomerics.com/products/THERMFLOW_T777.htm

At that website, you can even request a sample.  The sample is a sheet about 6 inches x 6 inches, and you can easily cut it up with scissors before removing the backing material.

We've used hundreds of square feet of the stuff, and for a gap-pad, it really is incredible.  Without going to screen printed thermal paste or gel, you simply can't do any better.  Hand applied thermal paste/gel doesn't even come close - it can not be applied thin or evenly enough to compete.

Engima

P.S. I have nothing to do with Parker/Chomerics other than being a satisfied customer.
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December 14, 2011, 06:32:11 AM
 #4

If you want to purchase some stuff easily, this also performed quite well.  It didn't quite match the Chomerics stuff, but it wasn't far off.  For this (less demanding) application, it would be more than adequate..

http://www.mouser.com/ProductDetail/Laird-Technologies-Thermal-Solutions/A15727-00/?qs=sGAEpiMZZMsiS1%252bJOF5PnwK1iNA68d4INe2jHMyAJwk%3d

Mouser ships FAST (Same day if ordered by 8PM EST) for reasonable prices.

Enigma
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December 14, 2011, 03:14:25 PM
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After EXTENSIVE testing for a military application that dissipates over 2500W (Yes, 2.5KW) over an area smaller than 25 sq. Inches, I can say that the absolute best thermal material is Parker Chomerics T777
http://www.chomerics.com/products/THERMFLOW_T777.htm
Thicknesses is 0.1mm, 1mm is needed.

Thanks I had missed it, while searching for "Thermal pads" only.
no good either, The thickness is 0.25mm
3.8W/m-K at 0.066$ per square cm 35$

Ferrishield is still on top. (but I don't need a  30x20 cm sheet)
TGF600M  6W/m-K at 0.10$ per square cm.60$
TGF280L  2.8W/m-k at 0.05$ per square cm.30$
Enigma81
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December 15, 2011, 02:59:40 AM
 #6

After EXTENSIVE testing for a military application that dissipates over 2500W (Yes, 2.5KW) over an area smaller than 25 sq. Inches, I can say that the absolute best thermal material is Parker Chomerics T777
http://www.chomerics.com/products/THERMFLOW_T777.htm
Thicknesses is 0.1mm, 1mm is needed.

Thanks I had missed it, while searching for "Thermal pads" only.
no good either, The thickness is 0.25mm
3.8W/m-K at 0.066$ per square cm 35$

Ferrishield is still on top. (but I don't need a  30x20 cm sheet)
TGF600M  6W/m-K at 0.10$ per square cm.60$
TGF280L  2.8W/m-k at 0.05$ per square cm.30$

Sorry that neither option helped you.  I may have provided better data if you had mentioned anything about a thickness requirement.

For reference, comparing Thermal Conductivity measurements (6W/m-K vs 3.8W/m-K) is useless when you have material of different thickness.  The Laird stuff is actually much better performing than the Ferrishield.  It's 63% as thermally conductive, but 25% the thickness - meaning it's 252% as thermally conductive overall.  The T777 is even better.

Good luck with your search

Enigma
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December 16, 2011, 09:30:02 AM
 #7

The last one is thermal tape, not thermal pads.

Used chewing gum is the cheapest thermal pad. Use it.


Cant tell if serious... No really. Is chewing gum a viable alternative?

Transisto
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December 17, 2011, 07:37:34 AM
 #8

How about Aluminum foil folded (+ smashed with a hammer) to correct height + non-conductive thermal paste ?

For when you can't wait for an order ...
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December 19, 2011, 05:37:11 AM
 #9

How about these:
http://www.dealextreme.com/p/heat-sink-thermal-silicone-paste-10cm-10cm-0-1cm-35819
 0.1cm thickness = 1mm

Note that these do not have a sticky side. I bought thermal glue to glue these pads to the case/heatsink.

I used them, so far no problem.
Details in this post.
https://bitcointalk.org/index.php?topic=46642.0

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Transisto
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December 19, 2011, 07:10:43 AM
 #10

How about these:
http://www.dealextreme.com/p/heat-sink-thermal-silicone-paste-10cm-10cm-0-1cm-35819
 0.1cm thickness = 1mm

Note that these do not have a sticky side. I bought thermal glue to glue these pads to the case/heatsink.

I used them, so far no problem.
Details in this post.
https://bitcointalk.org/index.php?topic=46642.0

Thanks I'd had never found that thing under the name "Paste".
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