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Author Topic: Butterfly Labs - Bitforce Single and Mini Rig Box  (Read 176598 times)
rjk
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May 04, 2012, 06:14:39 PM
 #1141

6" or 8" or so? 
I think he meant "how much time did it take before something went poof".

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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May 04, 2012, 06:16:10 PM
 #1142

I'm not sure, I didn't notice the burnt connectors at first - but no more than a couple days.


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abeaulieu
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May 04, 2012, 07:14:49 PM
 #1143

Is it just me or does this logo look pretty close to BFL's. This venture also stopped in Mar 2011... interesting.
http://asynclabs.com/
rjk
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May 04, 2012, 07:16:12 PM
 #1144

Is it just me or does this logo look pretty close to BFL's. This venture also stopped in Mar 2011... interesting.
http://asynclabs.com/
You might be interested in the 2 old BFL threads that are now locked. That similarity was discovered months ago, but doesn't seem to be relevant.

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May 04, 2012, 07:36:44 PM
 #1145

Pretty sure the logo is a stock clipart logo, so it's in use in a number of places in one form or another I'd imagine.

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May 04, 2012, 08:33:06 PM
 #1146

Seemed like a strange coincidence to me. Especially since it's a related technical sector and it closed its doors around the time that BFL appeared.
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May 04, 2012, 11:05:27 PM
 #1147

Actually I was curious about the cable length.  Smiley   
So you had less than 2% voltage drop on it but it couldn't handle what around 6.5 Amps.  Was it poor quality wire?

18AWG should be good for twice than length or more.

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May 05, 2012, 12:17:15 AM
 #1148

I'll have to snip the leads to the bottom fan
For simplicity in testing, I'd recommend just taping down the fan blade to keep it from spinning, or another low-tech method of restriction (a piece of chewed gum?).  If you get some thermal throttling, it's easy to make it spin again.

I would advise against that - a stuck motor can draw a multiple of the wattage that it normally draws, and thus overheat, even burn out.

Well, a piece of paper across the air intake should do the trick for testing, but I generally advise against trusting in any kind of thermal shutdown, especially if the unit is known to not have on-die temperature sensors and just measure the board/air/case temperature.
The singles do have on-die temp sensors, and they can be read with cgminer.

How can one read those? The usual "read temperature" command only returns one value that seems to be a board temperature, and that's the only command mentioned by the "specification".
I don't have a BFL myself, so I can't test this, but I'd be very interested in the commands for die temperature reading. Might be a useful addition to MPBM.

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May 05, 2012, 12:18:14 AM
 #1149

Actually I was curious about the cable length.  Smiley   
So you had less than 2% voltage drop on it but it couldn't handle what around 6.5 Amps.  Was it poor quality wire?

18AWG should be good for twice than length or more.
Interesting indeed... maybe it wasn't really 20 gauge?

This wire chart seems to indicate that 5 amps on 20 gauge should be able to run 9.5 feet without any trouble.
http://i119.photobucket.com/albums/o159/ocdropzone/electrical/WireChart.jpg?t=1242308611
rjk
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May 05, 2012, 12:20:25 AM
 #1150

Actually I was curious about the cable length.  Smiley   
So you had less than 2% voltage drop on it but it couldn't handle what around 6.5 Amps.  Was it poor quality wire?

18AWG should be good for twice than length or more.
Interesting indeed... maybe it wasn't really 20 gauge?

This wire chart seems to indicate that 5 amps on 20 gauge should be able to run 9.5 feet without any trouble.
http://i119.photobucket.com/albums/o159/ocdropzone/electrical/WireChart.jpg?t=1242308611

That chart.... is for what voltage? It might be correct for 120 volts, but not 12.

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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May 05, 2012, 12:25:01 AM
 #1151

Actually I was curious about the cable length.  Smiley   
So you had less than 2% voltage drop on it but it couldn't handle what around 6.5 Amps.  Was it poor quality wire?

18AWG should be good for twice than length or more.
Interesting indeed... maybe it wasn't really 20 gauge?

This wire chart seems to indicate that 5 amps on 20 gauge should be able to run 9.5 feet without any trouble.
http://i119.photobucket.com/albums/o159/ocdropzone/electrical/WireChart.jpg?t=1242308611

That chart.... is for what voltage? It might be correct for 120 volts, but not 12.

Amps are completely independent of voltage though.

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rjk
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May 05, 2012, 12:27:29 AM
 #1152

Actually I was curious about the cable length.  Smiley  
So you had less than 2% voltage drop on it but it couldn't handle what around 6.5 Amps.  Was it poor quality wire?

18AWG should be good for twice than length or more.
Interesting indeed... maybe it wasn't really 20 gauge?

This wire chart seems to indicate that 5 amps on 20 gauge should be able to run 9.5 feet without any trouble.
http://i119.photobucket.com/albums/o159/ocdropzone/electrical/WireChart.jpg?t=1242308611

That chart.... is for what voltage? It might be correct for 120 volts, but not 12.

Amps are completely independent of voltage though.
There are a large number of factors that affect wire ampacity. Here is a good calculator: http://circuitcalculator.com/wordpress/2007/09/20/wire-parameter-calculator/

You can see from that that it can support about 6 amps on 20 awg for a single wire at 25 degrees C. However, that ampacity is cut in half when the wire is in a bundle.

Mining Rig Extraordinaire - the Trenton BPX6806 18-slot PCIe backplane [PICS] Dead project is dead, all hail the coming of the mighty ASIC!
kano
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May 05, 2012, 12:34:12 AM
 #1153

I'll have to snip the leads to the bottom fan
For simplicity in testing, I'd recommend just taping down the fan blade to keep it from spinning, or another low-tech method of restriction (a piece of chewed gum?).  If you get some thermal throttling, it's easy to make it spin again.

I would advise against that - a stuck motor can draw a multiple of the wattage that it normally draws, and thus overheat, even burn out.

Well, a piece of paper across the air intake should do the trick for testing, but I generally advise against trusting in any kind of thermal shutdown, especially if the unit is known to not have on-die temperature sensors and just measure the board/air/case temperature.
The singles do have on-die temp sensors, and they can be read with cgminer.

How can one read those? The usual "read temperature" command only returns one value that seems to be a board temperature, and that's the only command mentioned by the "specification".
I don't have a BFL myself, so I can't test this, but I'd be very interested in the commands for die temperature reading. Might be a useful addition to MPBM.
I'm wondering if the cgminer temp is completely unrelated to the throttling temp?
(the cgminer temp is what BFL gave details about - so if there is some other then no one appears to know it
I have also asked in email to BFL details about other commands to the BFL ... since I now own one ...)
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Fuzzy
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May 06, 2012, 12:14:29 PM
 #1154

Does the MiniRig require a computer to run it, or can it work as a standalone with nothing but power and an internet connection?
rjk
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1ngldh


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May 06, 2012, 12:17:22 PM
 #1155

Does the MiniRig require a computer to run it, or can it work as a standalone with nothing but power and an internet connection?
It supposedly will have a Raspberry Pi included as the host, but with their limited availability I assume they will also be able to connect to an external host.

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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May 06, 2012, 01:08:06 PM
 #1156

No, I don't think the Raspberry Pi is included... there's space for it, but I think that's something you have to add on your own.

It's my understanding it will be like a giant single, and you can address the internal individual units individually or treat it as one giant single through a switch.

If you're searching these lines for a point, you've probably missed it.  There was never anything there in the first place.
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May 06, 2012, 06:01:25 PM
 #1157

No, I don't think the Raspberry Pi is included... there's space for it, but I think that's something you have to add on your own.

It's my understanding it will be like a giant single, and you can address the internal individual units individually or treat it as one giant single through a switch.


Happen to know if you can have a raspberry pi in one mini rig and have it run your other mini rigs and your singles? Having to obtain a raspberry pi for each one would be very costly to impossible. Ebay selling them for $400 buy it now and auctions are going over $200+.

I ordered a Pi a month ago but the order status seems to indicate many months to get it. Are they really in that much of a demand? Worse than the lead time on singles. Smiley
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May 06, 2012, 06:21:26 PM
 #1158

I ordered my raspberry pi a few days after they came out. It just shipped earlier this week. Now that they are in mass production they shouldn't be incredibly hard to acquire. And for $35 it's probably the cheapest, power efficient solution.
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May 06, 2012, 08:33:53 PM
 #1159

use an htpc

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May 06, 2012, 11:20:00 PM
 #1160

I ordered my raspberry pi a few days after they came out. It just shipped earlier this week. Now that they are in mass production they shouldn't be incredibly hard to acquire. And for $35 it's probably the cheapest, power efficient solution.

Wonder how many MH/s it gets  Grin
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