[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 483: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 483: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 483: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 483: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 483: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 483: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 483: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 483: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 483: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 483: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 483: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 483: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 483: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 483: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 483: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 483: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 483: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 483: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 483: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 483: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 483: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 483: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 483: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 483: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 483: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 483: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 112: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 112: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 112: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 112: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/feed.php on line 173: Cannot modify header information - headers already sent by (output started at [ROOT]/includes/functions.php:3823)
[phpBB Debug] PHP Warning: in file [ROOT]/feed.php on line 174: Cannot modify header information - headers already sent by (output started at [ROOT]/includes/functions.php:3823)
Parallella Community Supercomputing for Everyone 2014-10-17T01:29:26+00:00 https://parallella.org/forums/feed.php?f=11&t=1815 2014-10-17T01:29:26+00:00 2014-10-17T01:29:26+00:00 https://parallella.org/forums/viewtopic.php?t=1815&p=11230#p11230 <![CDATA[Re: Why Samtech connectors????]]> Statistics: Posted by osteth — Fri Oct 17, 2014 1:29 am

]]> 2014-10-16T03:30:44+00:00 2014-10-16T03:30:44+00:00 https://parallella.org/forums/viewtopic.php?t=1815&p=11221#p11221 <![CDATA[Re: Why Samtech connectors????]]>
Absolutely agree that for any low cost application, a SOM with a pcie or SODIMM edge connect is the way to go.

If you are trying to save cost and don't need all the pins, you don't have to populate all the connectors, you could get down to 1 or 2. Not sure I see a valid argument for the research market in saving $6 for 1-10 units?

If the Parallella volume gets high enough we would certainly consider producing a SOM like the raspi folks did. Of course, since we are completely open source you could always grab the source and build your own board at any time.

Andreas

Statistics: Posted by aolofsson — Thu Oct 16, 2014 3:30 am

]]> 2014-10-16T02:53:51+00:00 2014-10-16T02:53:51+00:00 https://parallella.org/forums/viewtopic.php?t=1815&p=11220#p11220 <![CDATA[Re: Why Samtech connectors????]]> Which means that on the board with 4 of them there is $24 in just connectors (+/- discounts) and wile each of them has 240 pin and only 48 of them are actually used meaning 912 pins are unused.
By elimination the connectors and switchon to a 52pin pci express board edge connection it would allow the same ammount of GPIO pins, remove the connector cost from the board almost entirely (minor additional costs for the board manufacturing) also, since the board needs to be vertical for fanless operation a backplane for connection mulitple boards would be completely ideal in a configuration like this and the connectors for the backplane are sub $1.

After looking at connectors for a bit I have only found one downfall to a doing a pci express board edge connection in to a socket such as this: http://www.digikey.com/product-detail/e ... ND/1002341
and that downfall is that it would limit the connection to 5gb/s in each direction. (requires gen2 pci express for 5gb/s)

the samtech connectors are fantastic connectors on paper for sure. but I personally just feel that in practiacl application that are overkill for the task and dificult to source in hobbyist/research quantities due to a low level of addoption in COTS products.

Statistics: Posted by osteth — Thu Oct 16, 2014 2:53 am

]]> 2014-10-15T17:02:39+00:00 2014-10-15T17:02:39+00:00 https://parallella.org/forums/viewtopic.php?t=1815&p=11210#p11210 <![CDATA[Re: Why Samtech connectors????]]> Why do you consider it expensive?
What are you building and what is your goal? A commercial product?

The BSH samtec connector was chosen due to combo of:
-low price (in volume, 1K+)
-low height
-high frequency
-density (240 pins on credit card size)
-mechanics

Andreas

Statistics: Posted by aolofsson — Wed Oct 15, 2014 5:02 pm

]]> 2014-10-15T12:11:46+00:00 2014-10-15T12:11:46+00:00 https://parallella.org/forums/viewtopic.php?t=1815&p=11200#p11200 <![CDATA[Re: Why Samtech connectors????]]> Statistics: Posted by osteth — Wed Oct 15, 2014 12:11 pm

]]> 2014-10-15T10:47:20+00:00 2014-10-15T10:47:20+00:00 https://parallella.org/forums/viewtopic.php?t=1815&p=11199#p11199 <![CDATA[Re: Why Samtech connectors????]]>
I'm afraid I don't know.

Personally — and this is pure personal opinion, again — I'd favour some sort of PCB backplane. Of course, this would clearly take up more space, but I have an aversion to cables in general (looking behind a desk or workbench at them tangled up actually makes me queasy!)

Cheers,

Andrew

Statistics: Posted by 9600 — Wed Oct 15, 2014 10:47 am

]]> 2014-10-15T09:54:49+00:00 2014-10-15T09:54:49+00:00 https://parallella.org/forums/viewtopic.php?t=1815&p=11198#p11198 <![CDATA[Re: Why Samtech connectors????]]> Statistics: Posted by xilman — Wed Oct 15, 2014 9:54 am

]]> 2014-10-15T08:36:24+00:00 2014-10-15T08:36:24+00:00 https://parallella.org/forums/viewtopic.php?t=1815&p=11195#p11195 <![CDATA[Re: Why Samtech connectors????]]> Statistics: Posted by 9600 — Wed Oct 15, 2014 8:36 am

]]> 2014-10-15T03:57:52+00:00 2014-10-15T03:57:52+00:00 https://parallella.org/forums/viewtopic.php?t=1815&p=11188#p11188 <![CDATA[Re: Why Samtech connectors????]]> Statistics: Posted by osteth — Wed Oct 15, 2014 3:57 am

]]> 2014-10-15T02:00:07+00:00 2014-10-15T02:00:07+00:00 https://parallella.org/forums/viewtopic.php?t=1815&p=11187#p11187 <![CDATA[Why Samtech connectors????]]> Statistics: Posted by osteth — Wed Oct 15, 2014 2:00 am

]]>