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Author Topic: Butterfly Labs - Bitforce Single and Mini Rig Box  (Read 176412 times)
spiccioli
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nec sine labore


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April 16, 2012, 06:39:22 AM
 #921

Exactly. From the looks of things you could put 2 BFL Single sandwiches in a normal BFL chassis. So, 3328 MH/s, 320w all running at 40-50 Celsius in a compact package. I'd pay a price premium for such a "mini mini rig".

I would say Nano Rig ©, then.  Roll Eyes

I would say Water Rig ©, then. Smiley
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April 16, 2012, 12:52:27 PM
 #922

sounds like fubar to me. No matter how cool you are able to keep it, it will never go faster than the bitstream thats loaded on it

While that is true a well cooled FPGA should be able to run a faster timed bitstream.  ztex (and others) take this a step further and use dynamic clocked bitstream where the clock is adjusted in realtime depending on error rate.  Cooler board = lower errors = higher clock.

Even if BFL didn't want to go that route there is no reason they "couldn't" (not to say they ever will) offer for multiple bitstreams at different clocks (and thus different power consumption and heat loads).
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April 16, 2012, 02:59:04 PM
 #923

Problem with any of their product is the noise from the fan means you can't keep it in your bedroom. Water cooling could solve that.
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April 16, 2012, 03:38:36 PM
 #924

Problem with any of their product is the noise from the fan means you can't keep it in your bedroom. Water cooling could solve that.

Yes, and then you could attach it to your waterbed, gradually warming up the waterbed in the process.

Sorry, couldn't resist...   Cheesy
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April 16, 2012, 03:43:03 PM
 #925

Problem with any of their product is the noise from the fan means you can't keep it in your bedroom. Water cooling could solve that.

It will be good white noise to help you sleep.
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April 16, 2012, 03:45:40 PM
 #926

Problem with any of their product is the noise from the fan means you can't keep it in your bedroom. Water cooling could solve that.

The stock 92mm Panaflow FBA09A12L fans used on the Singles (Rev2 at least; not sure about Rev3) are loud at 27dbA; they are rated for 43CFM and spin at ~2100RPM. It is easy to replace the fan(s) with something quieter, though you are sacrificing CFM. Meaning your Single will run hotter. If it runs too hot, it will throttle down (indicated by the front LED starting to blink) until it cools sufficiently. It may also contribute to an earlier death.

Depending on how hot your particular unit(s) run and your ambient temperature, something like the SilenX EFX-09-12 or more likely the EFX-09-15 can be good alternatives in keeping temperatures below the throttling point (which seems to occur ~75C). Either one of these fans are nearly inaudible in a normal room environment. They may still be too loud for a bedroom, though, depending on personal preferences.

If you want to go this route, you may wish to try a few different fans to find the right balance of silence and cooling. The Antec TriCool, for example, has a switch for 1200RPM, 1600RPM, and 2200RPM.

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JWU42
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April 16, 2012, 04:20:12 PM
 #927

Panaflo fans - excellent!

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April 16, 2012, 04:45:09 PM
 #928

Or don't run your single in your bedroom. You should be building a shrine somewhere instead. The more Singles the better.

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April 16, 2012, 04:45:58 PM
 #929

Or don't run your single in your bedroom. You should be building a shrine somewhere instead. The more Singles the better.

It's called the bottom shelf. Wink
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April 16, 2012, 04:46:08 PM
 #930

Or don't run your single in your bedroom. You should be building a shrine somewhere instead. The more Singles the better.
lol

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April 16, 2012, 04:51:12 PM
 #931

Or don't run your single in your bedroom. You should be building a shrine somewhere instead. The more Singles the better.
Or don't run Singles in your bedroom. Get some gigamining bonds instead. Right, gigavps?  Wink

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jamesg
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April 16, 2012, 04:54:27 PM
 #932

Or don't run Singles in your bedroom. Get some gigamining bonds instead. Right, gigavps?  Wink

The singles are all mine!

Gigamining is for the mini rigs boxes.
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April 16, 2012, 05:44:53 PM
 #933

Or don't run your single in your bedroom. You should be building a shrine somewhere instead. The more Singles the better.

It's called the bottom shelf. Wink

We can't all be so lucky to have half of the BFL's Singles that are available on our bottom shelves  Tongue

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April 16, 2012, 05:53:09 PM
 #934

We can't all be so lucky to have half of the BFL's Singles that are available on our bottom shelves  Tongue

What you call luck I call due diligence and intestinal fortitude. :p
bitcoindaddy
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April 17, 2012, 03:07:58 PM
 #935

Does the Single need a powered USB hub? If not, is there a limit of the number of unpowered devices that can be hooked up to a single USB port on the motherboard?
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April 17, 2012, 03:10:14 PM
 #936

Does the Single need a powered USB hub? If not, is there a limit of the number of unpowered devices that can be hooked up to a single USB port on the motherboard?
No, it has an external power brick. But a powered hub often tends to be higher quality anyway, and you might not be able to get an unpowered version with a large number of ports. The limit is 100 BFL Singles per system. The USB limit is 128, including the hubs themselves.

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DeathAndTaxes
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Gerald Davis


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April 17, 2012, 03:20:58 PM
 #937

Does the Single need a powered USB hub? If not, is there a limit of the number of unpowered devices that can be hooked up to a single USB port on the motherboard?
No, it has an external power brick. But a powered hub often tends to be higher quality anyway, and you might not be able to get an unpowered version with a large number of ports. The limit is 100 BFL Singles per system. The USB limit is 128, including the hubs themselves.

To expand on that.

The USB spec also limits unpowered hubs (technically the term is bus powered because all hubs need power from somewhere) to 4 downstream devices.  This is because there is a limit on how much power a USB port can provide.  USB port need to be able to safely provide 500ma.  The spec limits bus powered devices to 100ma ea.  Since the hub also needs some power that means 1 hub + 4 full load bus powered devices can be safely powered from a single port.  

While BFL Singles aren't bus powered the spec limits the # of ports for bus powered hubs since self powered and bus powered devices are interchangeable.  There are likely non-compliant bus powered hubs with more ports but given the low cost of powered hubs and very high cost of BFL Singles taking that risk to save a single power cord seems ... foolish.
TheSeven
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April 17, 2012, 03:27:12 PM
 #938

Does the Single need a powered USB hub? If not, is there a limit of the number of unpowered devices that can be hooked up to a single USB port on the motherboard?
No, it has an external power brick. But a powered hub often tends to be higher quality anyway, and you might not be able to get an unpowered version with a large number of ports. The limit is 100 BFL Singles per system. The USB limit is 128, including the hubs themselves.

Actually it's 127, not 128, and hubs with more than four ports are often two cascaded 4 port hubs internally. The tree may only be 8 hops (including those "internal" hubs and the device) deep.

A port of a USB host, or a self-powered (as in has a power brick, not powered by the bus) hub, can deliver up to 500mA, if the specs are met. (Some cheap self-powered hubs actually can't provide that on all ports at the same time, but usually they at least claim to.)
Each hub will allocate 100mA for itself, and each port needs to be allocated a minimum of 100mA in order to detect devices.
So in theory, you can't cascade bus-powered hubs by definition. However in many cases these constraints are completely ignored by manufacturers, allowing some combinations to work that should not be allowed in theory.

All of the currently available FPGA boards should only draw a maximum of 100mA, so they should be happy on every USB port, given the obvious constraints are met:
  • Maximum of 127 devices total per bus, counting hubs as well, including internally cascaded hubs
  • Cascade hubs at maximum 7 levels deep, also counting internally cascaded hubs
  • Only the last level of hubs (with no more than 4 ports each) may be bus-powered

Be aware that there might already be some hubs internally to your PC between the "root ports" and the actual ports on the PC's case, and that multiple USB "root ports" might be sharing the same bus and thus 127 device limit. Things like internal card readers, wifi/usb dongles, ... might also take away addresses.

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April 17, 2012, 05:01:23 PM
 #939

Just for interest sake regarding lots of USB devices ... with Icarus:
A 41 device setup: (edit: sorry that's 31, but he has 41 now)
https://bitcointalk.org/index.php?topic=51371.msg815296#msg815296

And Ngzhang testing 40 before shipping:
https://bitcointalk.org/index.php?topic=51371.msg808765#msg808765

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April 18, 2012, 06:33:38 PM
 #940

I just received three rev. 3 Singles yesterday and have unpacked and installed one of them, and the bottom fan is back!
No, it's not a rev. 2 single, it has the new heat pipe-based heat sink inside, but the weird bottom fan is back now!   Shocked
(I haven't taken a look at the other two Singles yet.)
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