I didn't know about Xilinx "vent holes" either. My comment was based entirely on my sincere faith in Whitlow's 3rd law: "Everything leaks". Although I'm no
vacuum guru, I've brushed against the art enough to have learned that lesson
very well.

Dana


On 4/16/2013 7:47 AM, Steve Maher wrote:


On Tue, Apr 16, 2013 at 7:37 AM, Jason Manley <[email protected] <mailto:[email protected]>> wrote:

> Merely dunking things in liquid will just get you hot liquid.

sure - the second part (radiator) was implied

     And I'd be concerned
    >     about the chip packages' leak integrity.


didn't know about Xilinx vent holes. We've dunked standard motherboards with no problem.


    Excellent point. In fact, the Xilinx packages have breather holes
    that prevent us from washing the boards after manufacture. So I'd
    be very nervous about this.

    > My point is, don't forget the radiator.  Then ask, perhaps, "Can
    I just attach the
    > chips to the radiator?".  Perhaps this is already what Jason is
    getting at, but he
    > didn't say how his "heatsink" was going to dispose of the heat.

    Yeah, big fins on the other side of the alu! You'd have to run the
    numbers to see how big and how many fins you'd need at
    altitude/thin air.

    Jason



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