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Author Topic: Max power draw for the fan header on the BFL single?  (Read 1880 times)
xDGDZEx
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May 01, 2012, 04:53:51 AM
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I'm thinking about replacing the fans on my singles with something that has a bit more oomph. Are there any published specs on this to anyone's knowledge?
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Inspector 2211
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May 01, 2012, 04:59:48 AM
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I'm thinking about replacing the fans on my singles with something that has a bit more oomph. Are there any published specs on this to anyone's knowledge?

+1
xDGDZEx
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May 01, 2012, 05:04:52 AM
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Yeah, I want to make sure I'm not going to fry anything when in hook up 140cfm deltas  Grin

Hopefully the overclocking functionality on easyminer will be good.
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May 01, 2012, 01:12:10 PM
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You could skip the fan header and directly connect to a PSU.  But then its will sound like rjks': http://vimeo.com/41028028    Grin

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May 14, 2012, 02:38:23 AM
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Still interested in this. BFL?
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May 14, 2012, 02:50:05 AM
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Then its will sound like rjks': http://vimeo.com/41028028    Grin

Holy shit. Imagine a room of 10 of those.

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May 14, 2012, 02:54:08 AM
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I'd also like to know. Has anyone put a higher CFM fan on that isn't connected to an additional PSU yet?
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May 14, 2012, 04:39:29 AM
 #8

I'm thinking about replacing the fans on my singles with something that has a bit more oomph. Are there any published specs on this to anyone's knowledge?

Definitely don't hook up a delta to the BFL internal jack. External PSU you'd be rockin and rollin

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May 22, 2012, 11:15:50 PM
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Nobody knows the specs for the bfl fan?

The fan that came with one of my singles is making a annoying buzzing noise so I was thinking of replacing it with something more powerful and perhaps quiet.


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May 22, 2012, 11:27:11 PM
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In this thread there's a nice discussion about fans with the BFL:
https://bitcointalk.org/index.php?topic=60586.msg868363#msg868363

I just replaced mine with the Noiseblocker BlackSilentPro.
Sooo much more quiet (and a more healthy acoustic frequency spectrum) and about the same temperature as the stock BFL fan.


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May 23, 2012, 09:39:28 AM
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In this thread there's a nice discussion about fans with the BFL:
https://bitcointalk.org/index.php?topic=60586.msg868363#msg868363

I just replaced mine with the Noiseblocker BlackSilentPro.
Sooo much more quiet (and a more healthy acoustic frequency spectrum) and about the same temperature as the stock BFL fan.



Thanks for the info Smiley Their CFM rating is lower than the stock Single one. I am thinking if one is going to put these somewhere far away a higher CFM fan would be better. I found 68 CFM fans with a noise signature of 43 dBA which is a tad bit higher than the stock Rev 3 fan (32).

The question is can the fan header on the Single handle the extra current draw. Is the cooling performance noticeably improved going from 45 CFM to 68 CFM.


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May 23, 2012, 09:47:57 AM
 #12

In this thread there's a nice discussion about fans with the BFL:
https://bitcointalk.org/index.php?topic=60586.msg868363#msg868363

I just replaced mine with the Noiseblocker BlackSilentPro.
Sooo much more quiet (and a more healthy acoustic frequency spectrum) and about the same temperature as the stock BFL fan.



Thanks for the info Smiley Their CFM rating is lower than the stock Single one. I am thinking if one is going to put these somewhere far away a higher CFM fan would be better. I found 68 CFM fans with a noise signature of 43 dBA which is a tad bit higher than the stock Rev 3 fan (32).

The question is can the fan header on the Single handle the extra current draw. Is the cooling performance noticeably improved going from 45 CFM to 68 CFM.



High-Current fans are not recommended. The reason is their inductive load and the noise injected to the power plane of the
board. The protection diode placed before the FAN header can withstand max 5A of current. So this sets the upper limit to 5A,
which translates into 60W on 12 Volts rails. This amount of power, along with the power consumption of the board itself can
exceed the Barrel Jack current rating, which is why we advise not to take any risks in this regard.


Regards,
BF Labs Inc.


BF Labs Inc.  www.butterflylabs.com   -  Bitcoin Mining Hardware
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May 23, 2012, 12:55:13 PM
 #13

High-Current fans are not recommended. The reason is their inductive load and the noise injected to the power plane of the
board. The protection diode placed before the FAN header can withstand max 5A of current. So this sets the upper limit to 5A,
which translates into 60W on 12 Volts rails. This amount of power, along with the power consumption of the board itself can
exceed the Barrel Jack current rating, which is why we advise not to take any risks in this regard.


Regards,
BF Labs Inc.
Are there 2 different diodes, one for each header? Or just one that covers both of them?
Also, if the barrel jack was replaced with something else, would the board itself support that current draw without issues? I'm guessing the warranty would be void in this case. Wink

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May 23, 2012, 01:16:07 PM
 #14

High-Current fans are not recommended. The reason is their inductive load and the noise injected to the power plane of the
board. The protection diode placed before the FAN header can withstand max 5A of current. So this sets the upper limit to 5A,
which translates into 60W on 12 Volts rails. This amount of power, along with the power consumption of the board itself can
exceed the Barrel Jack current rating, which is why we advise not to take any risks in this regard.


Regards,
BF Labs Inc.
Are there 2 different diodes, one for each header? Or just one that covers both of them?
Also, if the barrel jack was replaced with something else, would the board itself support that current draw without issues? I'm guessing the warranty would be void in this case. Wink

There is enough copper on the board to support maybe 20A on 12V rails. However, doing so will void the warranty,
and should be done at users own risk. Each fan header has a protection diode and a small stabilizing/filter capacitor.

EDIT:
I would also think that if someone is willing to take an extreme measure for cooling (speaking about minimum several units),
then it would be best to buy a split Air-Conditioner to get the job done. It will consume about 480W (samsung series),
and if the target is 20 singles for instance, then it would be equivalent to an additional 24W per single.

Regards,
BF Labs Inc.

BF Labs Inc.  www.butterflylabs.com   -  Bitcoin Mining Hardware
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