mersenneforum.org  

Go Back   mersenneforum.org > Great Internet Mersenne Prime Search > Hardware

Reply
 
Thread Tools
Old 2016-04-18, 18:44   #1
Fred
 
Fred's Avatar
 
"Ron"
Jan 2016
Fitchburg, MA

97 Posts
Default I call her "Prime Box"

32 cores of prime hunting goodness

https://drive.google.com/folderview?...kk&usp=sharing
Fred is offline   Reply With Quote
Old 2016-04-18, 18:58   #2
Mark Rose
 
Mark Rose's Avatar
 
"/X\(‘-‘)/X\"
Jan 2013

55538 Posts
Default

Tempting...
Mark Rose is offline   Reply With Quote
Old 2016-04-18, 21:33   #3
bgbeuning
 
Dec 2014

3×5×17 Posts
Default

She is very pretty.

You used ATX-24 power splitters instead of the PicoPSU's.
So does pressing the power switch on any board start the PSU for all of them?
bgbeuning is offline   Reply With Quote
Old 2016-04-18, 22:53   #4
Prime95
P90 years forever!
 
Prime95's Avatar
 
Aug 2002
Yeehaw, FL

24×32×53 Posts
Default

Quote:
Originally Posted by Fred View Post
32 cores of prime hunting goodness
Very nice, I'm jealous. I just started ordering parts for CPU #6 and #7. I guess I need to cram in CPU #8 or I'll feel inferior.

BTW, where did you get the Y-cables? Temps OK? From what I can see only the PSU fan is moving air through the enclosure?
Prime95 is offline   Reply With Quote
Old 2016-04-19, 00:37   #5
Fred
 
Fred's Avatar
 
"Ron"
Jan 2016
Fitchburg, MA

97 Posts
Default

Quote:
Originally Posted by bgbeuning View Post
She is very pretty.

You used ATX-24 power splitters instead of the PicoPSU's.
So does pressing the power switch on any board start the PSU for all of them?

Ebay: http://www.ebay.com/itm/261180756961

No power switches. I used a paperclip across the power button connector on the motherboard to power them up initially, and then set the bios of each motherboard to auto power on upon power restore. If I lose power, they would all just power up upon power being restored. If I want to power cycle one or all of them for any reason, I just power down (via the OS) all 4 motherboards on any given power supply. Then to restart I just flip the power switch on the power supply (which simulates power loss), and all 4 start back up.
Fred is offline   Reply With Quote
Old 2016-04-19, 00:47   #6
Fred
 
Fred's Avatar
 
"Ron"
Jan 2016
Fitchburg, MA

97 Posts
Default

Quote:
Originally Posted by Prime95 View Post
Temps OK? From what I can see only the PSU fan is moving air through the enclosure?
Temps are good. In the upper 70s, but it's warm in my office today. There is no powered ventilation, but the entire back (that you can't see in the pics) is wide open. Also, there are large 3 inch or so gaps between the sheets of acrylic (front center and the corners). The acrylic is really just to give the "box" extra rigidity. With all the gaps and the back wide open, I don't think temps will be an issue.

Wednesday the whole thing heads in to the college I work at. One of my buddies in IT is letting me stick it in one of his network closets. Might as well let the college burn the 600 watts. It IS math research after all.

Besides, that will clear space on my desk at home to start Prime Box 2.
Fred is offline   Reply With Quote
Old 2016-04-19, 00:56   #7
Mark Rose
 
Mark Rose's Avatar
 
"/X\(‘-‘)/X\"
Jan 2013

37×79 Posts
Default

Quote:
Originally Posted by Fred View Post
That's a lot cheaper than the George's solution. I did not know that the CX430M could supply enough power off the ATX-24 cable for four boards!
Mark Rose is offline   Reply With Quote
Old 2016-04-19, 01:29   #8
Fred
 
Fred's Avatar
 
"Ron"
Jan 2016
Fitchburg, MA

97 Posts
Default

Quote:
Originally Posted by Mark Rose View Post
I did not know that the CX430M could supply enough power off the ATX-24 cable for four boards!
It was perhaps a bit naive of me. I'm not really that into hardware. Seemed like it should work so I gave it a go. Each side (of 4 boards) draws about 300 watts at the wall and they seems to be running fine. I've had the first stack of 4 running for at least a couple months now without issue.
Fred is offline   Reply With Quote
Old 2016-04-19, 04:05   #9
Prime95
P90 years forever!
 
Prime95's Avatar
 
Aug 2002
Yeehaw, FL

24·32·53 Posts
Default

Quote:
Originally Posted by Mark Rose View Post
That's a lot cheaper than the George's solution. I did not know that the CX430M could supply enough power off the ATX-24 cable for four boards!
Indeed, much cheaper. I was trying to distribute the power over multiple PSU cables. I might now try a mixture -- power 3 or 4 boards with splitters and 3 or 4 with picoPSUs.
Prime95 is offline   Reply With Quote
Old 2016-04-19, 16:13   #10
Madpoo
Serpentine Vermin Jar
 
Madpoo's Avatar
 
Jul 2014

CF116 Posts
Default

Quote:
Originally Posted by Fred View Post
Wednesday the whole thing heads in to the college I work at. One of my buddies in IT is letting me stick it in one of his network closets...
And hopefully it's cooled in there too... extra bonus.
Madpoo is offline   Reply With Quote
Old 2016-04-20, 12:32   #11
bgbeuning
 
Dec 2014

3·5·17 Posts
Default

Quote:
Originally Posted by Fred View Post
Those use 18 gauge wire which I would recommend limiting to under 10 A current.
(Wikipedia says 14 A heats AWG 18 wire to 90 C.)
300 W at 12 V is 25 A so the PSU wire needs AWG 12 or 14.
And it would be having 12.5 A on the first Y cable.
The above is the worst case. The load is probably spread over multiple wires.

If none of the wires feel hot to the touch, it should be safe.
A "loop" current meter will let you check each wire.
bgbeuning is offline   Reply With Quote
Reply

Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Call for GPU Workers to help at the "LL Wavefront" chalsall GPU Computing 24 2015-07-11 17:48
Aouessare-El Haddouchi-Essaaidi "test": "if Mp has no factor, it is prime!" wildrabbitt Miscellaneous Math 11 2015-03-06 08:17
Speeding up double checking when first test returns "prime" Unregistered PrimeNet 16 2006-02-28 02:00
Oh noes! The "42nd Mersenne prime" isn't prime! ixfd64 Lounge 7 2005-04-03 19:27
Would Minimizing "iterations between results file" may reveal "is not prime" earlier? nitai1999 Software 7 2004-08-26 18:12

All times are UTC. The time now is 22:47.


Wed Oct 20 22:47:53 UTC 2021 up 89 days, 17:16, 2 users, load averages: 1.78, 1.45, 1.32

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2021, Jelsoft Enterprises Ltd.

This forum has received and complied with 0 (zero) government requests for information.

Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation.
A copy of the license is included in the FAQ.