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Shadow383
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April 12, 2012, 03:57:47 PM |
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Just out of curiosity, do you still need those small fans on the Icarus heatsinks? Wouldn't it be sufficient or even better to close the "case" on the top and force the air through the heatsinks? What's the airflow (cfm) of these fans?
In case this is suited better for another thread, let me know.
No, that wouldn't work, the Icarus stock heatsinks are way too small for that and need quite a bit of airflow. Even a huge fan sitting next to them (but blowing from the side is barely sufficient, so at least the second-row boards wouldn't be happy with such a setup. Sadly you can't easily swap the heatsinks on these boards... I would think that the turbulence caused by perpendicular airflows would have lesser cooling capability than higher-velocity ducted flow that was relatively linear. So, fans in a push-pull and a cover on the case (clear plexi?) ought to give even better cooling. Turbulence is (or at least should be) the aim when doing forced cooling like this, since a turbulent boundary layer has much greater speeds close to the surface, and thus is better at drawing heat from the surface into the free-stream flow. |
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"If you don't want people to know you're a scumbag then don't be a scumbag." -- margaritahuyan
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roomservice
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April 13, 2012, 01:20:36 PM |
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Here is my first FPGA Mining Rig. Click the picture for larger view.  |
"Tonight's the night. And it's going to happen again, and again. It has to happen. Nice night."
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Glasswalker
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April 13, 2012, 02:32:39 PM |
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To answer the previously posted questions: - it's 6GHash roughly (18 boards). I technically have 17 cards, but the last one is mining seperately, or being used for development and testing of our own bitstream. - When combined with our GPUs that brings our effective hashrate well over 12GHash/s right now. - The fans are 80CFM fans. They are enough to keep constant fresh air moving through the case while the individual fans on the cards deal with airflow to the heatsinks. The previous comments are correct, I could go to higher CFM fans on the front and use additional pull fans on the back, and add larger heatsinks to the boards for more efficient cooling. But the noise would be much higher as well (These are in my home right now). I'll be moving them to a proper datacenter in the future. At which time I'll then change out the cooling solution to be higher efficiency (by then it will no longer be a wooden case, but a custom designed steel 3U rackmount case as well, plus it will likely be up to 24+ cards per case) - Give me 3-4 months... I'll likely have some MUCH more impressive photos  - Also the intent is that case will run closed in the end. But right now the cabling causes too much airflow restriction. I'll be cleaning it up significantly once I have time, and designing ducting to force the air past the cards while seperating airflow from cabling space. This is just the prototype, once the prototype is finished and works well I'll be having custom rackmount cases fabbed up in steel. |
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jamesg
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April 13, 2012, 07:55:21 PM |
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It's that time again. Moved some things around a bit.  |
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P_Shep
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This is not OK.
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Beaflag VonRathburg
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April 13, 2012, 09:08:34 PM |
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Darn. I've been saying I'm going to order mine for a week now and just haven't pulled the trigger yet. You're making me jealous. It's time! |
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allinvain
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April 13, 2012, 09:16:45 PM |
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Nice P_Shep..I'm glad to finally see someone using the revision 3 BFL Singles. That means they're finally cranking up production. I take it you went in early on in the waiting queue.
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P_Shep
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This is not OK.
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April 13, 2012, 09:24:11 PM |
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Nice P_Shep..I'm glad to finally see someone using the revision 3 BFL Singles. That means they're finally cranking up production. I take it you went in early on in the waiting queue.
Yeah, all I can say is "About 'ing time!". Still have some more to come though... |
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Inspector 2211
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April 13, 2012, 09:30:09 PM |
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It's that time again. Moved some things around a bit. 11 x Rev.2 and (in the back) 4 x Rev. 3, if I count correctly? |
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rjk
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1ngldh
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April 13, 2012, 09:31:12 PM |
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Currently mining away at 1651MH/s using 155W (2xBFL, Router, USB hub) at the wall.  So sexy. Nice job, BFL on the design. |
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jamesg
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April 13, 2012, 09:44:04 PM
Last edit: April 14, 2012, 08:59:32 PM by gigavps |
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11 x Rev.2 and (in the back) 4 x Rev. 3, if I count correctly?
The count is: Rev1 == 4 Rev2 == 7 Rev3 == 4 The ones closets to the PC are Rev1s. They're taller than Rev2 because they use just the big heatsinks on the bottom. |
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Garr255
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What's a GPU?
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April 14, 2012, 05:28:55 AM |
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“First they ignore you, then they laugh at you, then they fight you, then you win.” -- Mahatma Gandhi
Average time between signing on to bitcointalk: Two weeks. Please don't expect responses any faster than that!
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antirack
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April 14, 2012, 06:15:31 AM |
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Did I see that right, you removed some of the fans on the heat sinks but you kept the ones on the top? Are these the USB hubs in pic 81.jpg with the blue LEDs? 11 port USB hubs? 19 x X6500? |
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Garr255
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What's a GPU?
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April 14, 2012, 06:25:20 AM |
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Yeah, the sinks on under the top don't need individual fans, because of the stacked 80mm's. They are 12 port USB hubs with the switches and LEDs.
Yes, 19 x6500s. 18 Cognitive, and one belongs to someone who could not have it shipped to their country, and is mining for them.
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“First they ignore you, then they laugh at you, then they fight you, then you win.” -- Mahatma Gandhi
Average time between signing on to bitcointalk: Two weeks. Please don't expect responses any faster than that!
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Turbor
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BitMinter
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April 14, 2012, 11:37:15 AM |
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No matter what people say about BFL and their lead times, revision 3 rocks! A miners dream. And some still dream about a GPU future...  |
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JWU42
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April 14, 2012, 02:37:00 PM |
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p_shep - thanks for the Rev3 pics!
gigavps - are the Rev 3 (assuming Rev4 is a typo) running any cooler? Can't tell what is what on the mgpumon display...
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jamesg
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April 14, 2012, 09:01:58 PM |
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p_shep - thanks for the Rev3 pics!
gigavps - are the Rev 3 (assuming Rev4 is a typo) running any cooler? Can't tell what is what on the mgpumon display...
lol. I have no idea which is which either! I was told by BFL that the temps displayed can vary quite a bit. The most important thing is for the singles to not start flashing their front LED at the ambient temp while mining. |
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Inspector 2211
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April 14, 2012, 10:14:48 PM |
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p_shep - thanks for the Rev3 pics!
gigavps - are the Rev 3 (assuming Rev4 is a typo) running any cooler? Can't tell what is what on the mgpumon display...
lol. I have no idea which is which either! I was told by BFL that the temps displayed can vary quite a bit. The most important thing is for the singles to not start flashing their front LED at the ambient temp while mining. I have it running in my 90 degree (est.) mining office and it doesn't seem to throttle. Excellent job, BFL. |
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SamHa1n
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April 17, 2012, 04:14:53 AM |
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aseldon
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April 17, 2012, 04:26:16 AM |
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Excellent looking setup. What kind of boards are those and what do you use to power and manage them?
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