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Author Topic: FPGA Rig Photos  (Read 42521 times)
Shadow383
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April 12, 2012, 03:57:47 PM
 #41

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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April 13, 2012, 01:20:36 PM
 #42

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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April 13, 2012, 02:32:39 PM
 #43

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 Wink

- 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.

Just trying to make Bitcoin a Success... One crazy project at a time. (13rwPKskyATcAq3PpnCikfFG8989DQ8M3c)
HashVoodoo Open Source FPGA Mining Bitstream: https://github.com/pmumby/hashvoodoo-fpga-bitcoin-miner
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April 13, 2012, 07:55:21 PM
 #44

It's that time again. Moved some things around a bit.

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April 13, 2012, 08:22:26 PM
 #45

Currently mining away at 1651MH/s using 155W (2xBFL, Router, USB hub) at the wall.

Smiley





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April 13, 2012, 08:34:39 PM
 #46

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.
That's my design spec - currently building the infrastructure, waiting for 25 ZTEX 1.15x FPGAs.

Top (visible) board will be more or less square and have five columns with 5 boards each per column. Each column will have an 80mm fan pushing air in from the bottom and another at the top sucking air out. The main board will be mounted on a 45˚ incline to show off and also let physics help the fans out. Each set of 5 fans (blowers and suckers) will be powered from the main PSU on a separate 12V circuit with variable resistor, so if the cooling is more than adequate, I can reduce noise by turning down the fans.

Each column will be separated from its adjacent neighbour by an acrylic (perspex / whatever) panel. I had the same idea as nyana regarding drilling holes in the visible mounting board to run the USB and power cable through - I'll probably paint the base board copper or something. Underneath the base board, the USB hubs and power daisychains will be hidden with another board (false floor), so the only visible cabling will be one USB cable (for the entire farm), and five 2.1/5.5mm female sockets for FPGA power. The variable resistors for the fan circuits will probably be mounted on the side of the main board.

The board will then look like 5 'tunnels' with a fan at each end, separated by perspex. I haven't yet worked out the gasketing design yet (since the top panel will need to be easily removed for maintenance) but the top panel will be clear acrylic too. I'm hoping to equip each of the 25 FPGAs with blue Zalman flower northbridge coolers, as they look fantastic... but have only managed to buy 7 so far, and an order of 18 off Amazon got cancelled by the vendor after messing me around for 2 weeks.

This will be geek eye-candy, but also I've learned from GPU mining that having near-vertical airflow works well, so the board will be mounted at 45˚ and the space behind the board used to store the ATX PSU (PCIe cables will feed 12VDC to the FPGAs using custom cables, no butchering of the ATX PSU cables, and a plain Molex connector will suffice to feed the fans), and the Mac netbook powering the system (it's a Dell Mini 10v, running Snow Leopard and my build of the ZTEX SDK - the little netbook was chosen as it consumes low power, and running OS X allows me to easily view the screen from my other Macs).

Should be neat and tidy, hopefully should run with passive coolers and *hopefully* not too loud. Pics when I'm up and running - I've got all the bits I need apart from the FPGAs and 18 of the Zalman heatsinks, and am building the assembly now. Hopefully, when the FPGAs arrive, all I'll need to do is screw them into the mounting posts already built into the top board, attach USB and power cables, drop the perspex lid on to create the 'wind tunnel' cooling, program the FPGAs and kick off the miner.

If it works well without any snags then I'll duplicate it when I get funds for the next load. I reckon a 600W PSU ought to be more than enough and should deliver clean enough power so the FPGA power conversion stages don't have to do much work... I've got Cooler Master PSUs, my only concern is not using anything other than the 12V rail (which I'll start another thread about)...

...so I give in to the rhythm, the click click clack
I'm too wasted to fight back...


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Beaflag VonRathburg
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April 13, 2012, 09:08:34 PM
 #47


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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April 13, 2012, 09:16:45 PM
 #48

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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April 13, 2012, 09:24:11 PM
 #49

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...
Inspector 2211
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April 13, 2012, 09:30:09 PM
 #50

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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April 13, 2012, 09:31:12 PM
 #51

Currently mining away at 1651MH/s using 155W (2xBFL, Router, USB hub) at the wall.

Smiley
So sexy. Nice job, BFL on the design.

Mining Rig Extraordinaire - the Trenton BPX6806 18-slot PCIe backplane [PICS] Dead project is dead, all hail the coming of the mighty ASIC!
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April 13, 2012, 09:44:04 PM
 #52

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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April 14, 2012, 05:28:55 AM
 #53

Taken with a blackberry Tongue

http://dl.dropbox.com/u/9542654/btc/k/IMG_00000076.jpg
http://dl.dropbox.com/u/9542654/btc/k/IMG_00000081.jpg

* not sure of the syntax to resize an image so posts links instead *

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April 14, 2012, 06:15:31 AM
 #54

Taken with a blackberry Tongue

http://dl.dropbox.com/u/9542654/btc/k/IMG_00000076.jpg
http://dl.dropbox.com/u/9542654/btc/k/IMG_00000081.jpg

* not sure of the syntax to resize an image so posts links instead *

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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April 14, 2012, 06:25:20 AM
 #55

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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April 14, 2012, 11:37:15 AM
 #56

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... Roll Eyes

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April 14, 2012, 02:37:00 PM
 #57

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...

GPG PubKey | THREEMA | OTC | HeatWare | 1JWU42QLGFESoQCC4iPzUDTRiC9nx5bi95
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April 14, 2012, 09:01:58 PM
 #58

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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April 14, 2012, 10:14:48 PM
 #59

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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April 17, 2012, 04:14:53 AM
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