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 Calle » Sun Mar 16, 2014 5:54 pm

JohnR wrote:
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.

JohnR


Thanks for the info. Unfortunately, I don't have access to any of these things.
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Re: cooling and more memory?

Postby aolofsson » Sun Mar 16, 2014 7:27 pm

The placement of the tall cap was unfortunate...we are now testing to see if it's safe to remove it. So far so good...
In the future versions, these tall 100uF caps will be moved to to the bottom side.

Andreas
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Re: cooling and more memory?

Postby Janos » Sun Mar 16, 2014 7:58 pm

Very nice
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Re: cooling and more memory?

Postby Calle » Mon Mar 24, 2014 9:37 pm

Anyone running something like a 120mm computer fan on a couple of Parallellas? How do you power it?
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Re: cooling and more memory?

Postby ubii » Mon Mar 24, 2014 10:08 pm

Calle,

If you can find a 5V fan, then you can draw power from the board itself, as explained in the following post.

viewtopic.php?t=1049&p=6643#p6643

The other option is to use a standard PC power supply and use the 5V rail to power the board(s) and the 12V rail to power the fan(s).
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Re: cooling and more memory?

Postby Calle » Tue Mar 25, 2014 7:13 pm

ubii wrote:Calle,

If you can find a 5V fan, then you can draw power from the board itself, as explained in the following post.

viewtopic.php?t=1049&p=6643#p6643

The other option is to use a standard PC power supply and use the 5V rail to power the board(s) and the 12V rail to power the fan(s).


Thank you ubii, for answering my questions. :)

The idea with the PC PSU sounds interesting, have you done this yourself? I guess I have to remove the connectors that are on the PSU and attach barrel plug connectors.
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Re: cooling and more memory?

Postby ubii » Tue Mar 25, 2014 8:52 pm

Calle,

No problem, happy to help any way I can. As for using a PC PSU, I actually got the idea from several RPi Clusters that I have seen built, like in the video below.

https://www.youtube.com/watch?v=i_r3z1jYHAc

Seeing as I only have the initial Zedboard-based prototype and a Gen 1.1 Parallella board, as part of the EARLY-ACCESS pledge level, I really don't have much of a need yet for a PC PSU to power everything. Originally, I had planned on buying either a mini-cluster (4 boards) or cluster (8 boards), but upgraded my pledge shortly before the end of the KS campaign. Once they start accepting new orders, I will probably order at least a few more boards and build a small cluster.

As for powering a cluster of Parallella boards using a PC PSU, you could either connect the 5V rail to the mounting hole pads, like 9600 suggested, and power all the boards by connecting together with metal standoffs or build/buy several molex to barrel plug adapters and only power the boards via the barrel jacks.
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Re: cooling and more memory?

Postby Transcendental » Tue May 06, 2014 7:59 pm

At J15, to power a fan, is there any particular reason a U-shaped wire is recommended for soldering, instead of a pair of header pins and jumper ?
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Re: cooling and more memory?

Postby aolofsson » Tue May 06, 2014 8:05 pm

Yes, due to a "doh!" in layout, the J15 was placed directly above the samtec connector on the bottom side of the board.
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Re: cooling and more memory?

Postby AlbertoGP » Sat May 10, 2014 6:10 pm

aolofsson wrote:The placement of the tall cap was unfortunate...we are now testing to see if it's safe to remove it. So far so good...


Did any issues appear since then?
Can I just unsolder it?

I have the board working fine, but the Epiphany does get very hot.
However, the Zynq is supposed to get even hotter: would it be counterproductive to put a common bigger heatsink over both chips?
Would that transfer extra heat to the Epiphany?

I'd like to use a ~40x40mm heat sink, the kind used in motherboards for the northbridge chipset or Intel PT/1000 Ethernet cards:
http://thumbs.dreamstime.com/z/north-bridge-chipset-heatsink-653014.jpg
It would rest on the Zynq, Epiphany, and the HDMI chip, and be kept in place with a custom clip hooked at TP12, TP13, TP14 or maybe at the card edges, whatever works better when I try it out.
Is there any obvious problem with this?
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