cooling and more memory?

Any technical questions about the Epiphany chip and Parallella HW Platform.

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Re: cooling and more memory?

Postby 9600 » Wed Mar 05, 2014 4:03 pm

If you like brand names, I used an EBM PAPST 255H with mine, but being very small and high output, it is quite noisy (and with the volume of air coming out of the sides of the enclosure you could almost dry your hair!) This is very clearly overkill and was just something I had in the workshop. One of the lower output 255 variants would probably be more than enough, else something of a similar size from another manufacturer.

Cheers,

Andrew
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Re: cooling and more memory?

Postby mranderso » Wed Mar 05, 2014 4:38 pm

ubii, thanks for the link, that will definitely be useful.

Sundance, sorry I wasn't more emphatic about the obvious need for heat
sinks and fans. I was hoping to address that each board was a unique
snowflake. That someone might experience miraculous behavior, but not to
generalize and think that everyone's board might perform exactly the
same. And thanks for figuratively batting my hand away from the box's
lid. Friend from college was a Mechanical Engineer that used to model
cooling systems and design PC enclosures. Have heard much in the past
of the importance of keeping the box closed and allowed to function as
designed

Andreas, sorry for the scare. Sadly, I've not been adventurous enough to
hook all eight up at once into a working cluster without understanding
my cooling needs. Have only had one board powered on at a time. That,
and the fact the components arrived just before the distracting last
weekend of Carnival. Also, still waiting on additional components that
Amazon, in it's ignorance of boots on the ground reality, claimed would
be delivered on Mardi Gras day.

Andrew, thanks. Appreciate the experience based specific part
recommendation, otherwise I'll spend all day on Amazon in frozen in
indecision. Wish I had hair left that needed drying.
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Re: cooling and more memory?

Postby Calle » Fri Mar 07, 2014 10:13 pm

I haven't received my boards yet (but they are on their way!), but I have been considering maybe getting a larger heatsink that would cover the Zynq, the Epiphany and maybe a bit of the RAM chip. The greater surface area would give more heat dissipation (I hope).

I wouldn't want the heatsink to stick out over the edges of the board and not be too high, since I still want to stack four Parallellas on top of each other.

Any thoughts or comments on this? Would a larger heatsink be in the way of anything (connectors etc)? Any other reason it wouldn't work?
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Re: cooling and more memory?

Postby 9600 » Sat Mar 08, 2014 5:36 pm

Calle wrote:Any thoughts or comments on this? Would a larger heatsink be in the way of anything (connectors etc)? Any other reason it wouldn't work?


This is a great idea and Andreas and I were discussing this just the other day. I believe the Zynq and Epiphany are pretty much level in terms of height, but I'm not sure if there might be a cap which is higher — I'd have to check.

Cheers,

Andrew
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Re: cooling and more memory?

Postby shodruk » Sat Mar 08, 2014 5:42 pm

I think the Zynq will heat the Epiphany. :lol:
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Re: cooling and more memory?

Postby ubii » Sat Mar 08, 2014 6:01 pm

9600 wrote:
Calle wrote:Any thoughts or comments on this? Would a larger heatsink be in the way of anything (connectors etc)? Any other reason it wouldn't work?


This is a great idea and Andreas and I were discussing this just the other day. I believe the Zynq and Epiphany are pretty much level in terms of height, but I'm not sure if there might be a cap which is higher — I'd have to check.

Cheers,

Andrew


9600,

Unfortunately, the little fellow circled in green in the photo below, will preclude this option, as it is too tall.
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Re: cooling and more memory?

Postby Calle » Sun Mar 16, 2014 10:53 am

ubii wrote:
9600 wrote:
Calle wrote:Any thoughts or comments on this? Would a larger heatsink be in the way of anything (connectors etc)? Any other reason it wouldn't work?


This is a great idea and Andreas and I were discussing this just the other day. I believe the Zynq and Epiphany are pretty much level in terms of height, but I'm not sure if there might be a cap which is higher — I'd have to check.

Cheers,

Andrew


9600,

Unfortunately, the little fellow circled in green in the photo below, will preclude this option, as it is too tall.


I see, thanks for the info. It could still work if I find a heatsink with a strange enough shape. ;)

Actually, how tall is the green circled fellow? Do you think it would be enough to add 3mm thick thermal pads to the Epiphany and Zynq chips?
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Re: cooling and more memory?

Postby JohnR » Sun Mar 16, 2014 12:18 pm


Unfortunately, the little fellow circled in green in the photo below, will preclude this option, as it is too tall.



It would be trivial to machine a little notch to allow the heat sink to cover both devices?

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Re: cooling and more memory?

Postby Calle » Sun Mar 16, 2014 12:36 pm

It would? What kind of tool would be needed to machine such a notch in a heatsink?
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Re: cooling and more memory?

Postby JohnR » Sun Mar 16, 2014 1:10 pm

It would? What kind of tool would be needed to machine such a notch in a heatsink?


At the minimum. if you have access to a drill press with a vice - drill a 1/2" hole into the base of the heatsink at the right place.

Better - with access to a machine shop, have them mill an appropriate recess into the base.

Also check that, for sure, the top surfaces of the two chips are really in the same plane.

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