Re: Klondike - 16 chip ASIC Open Source Board

Quote from: alfabitcoin on May 14, 2013, 05:55:07 PM

Quote from: BkkCoins on May 14, 2013, 03:10:59 PM

an aside, I'd like to know if using silver epoxy solder available at some electronics shops is viable for on the fly upgrades. It may be easy to paint a little bit on the QFN tabs and then carefully place and hold until hardened. My question would be heat transfer - whether silver/epoxy will conduct enough heat? )

Have updated original post now.

http://www.mgchemicals.com/products/adhesives/electrically-conductive/silver-conductive-epoxy-8331/

Thanks for that info. Their data sheets give some figures for thermal conductivity. The 10 min curing epoxy is not nearly as conductive as the 4 hour long-cure version.

10 min = 0.893 W/(mK)

4 hour = 1.75 W/(mK)

This one being more thermally conductive then their thermal adhesives.

For miners who want to pre-assemble boards and then add ASIC chips later when they arrive it may be useful to run some tests. It's a lot lower than SnAg solder (being about 50 W/(mK) ) but also a very thin layer would be used so it may have little net effect. Anyway, I don't want to side track things - it was just something I thought about.