Topic: BFL ASIC Firmware & Hardware, Understanding & Optimization (Read 15660 times)

Ended up replacing my fans with:
VORTEX CF-V12S
70 CFM and 17.7 dB each.

Removed the side panels because they block the airflow like hell, whoever designed them should be fired.

Temps is now 68-70C and sound is manageable. Can sit on skype and play computer games in the same room without anyone complaining.

Replaced with GT 1850 on both end, much lower noise, temp down to 58c. But the mod that remove the 92MM fan and add a forced airflow channel does not work for me, temp went over 70c in a couple of minutes. Changing the 92MM fan to face downwards also does not work, that reduced the overall airflow speed through the box, thus raise the temp eventually, seems the pull configuration is there to improve the overall airflow

I am running the 60GH/s devices naked, with 92mm Noctua NF-B9 fans.
I have Honywell HY900E fans blowing the heat away on fan level 1
The acoustics are 42db for 3 miners 
My temperatures are between 65 and 77

I have a feeling that the Noctua's I have have have a lower airflow than the BFL fans. I cannot measure this, and the BFL fans have no markings on it.

Good luck

Getting new fans for the Single tomorrow. But, what cfm value should I atleast have on my new fans?

Anyone know what cfm the original fans have? (cfm = airflow).
And also, do I need to have PWM fans?

Nice to see a thread about the Bitforce SC Noise

Once the 4 Bitforce SC 60 GH/s devices were set up I was in shock, I was expecting something just a bit quiter considering the original spec of one fan.
Most people bought these to run at home, not in a data center where they belong.

When I searched no water cooling solution.. aagh!
Running out of time before my second order shipped, I converted my second delivery slot because the insane noise 4 these devices make, I could not risk doubling the noise in my middle flat fearing the noise violation police running 4 more miners.
I now am on the waiting list for a year hosting of 500GH/s, hope I get ROI.

Now to solutions.
I read a post here to reduce the loud acoustic level, what do you guys think?
I am thinking that they offer a quieter SC than the modified end panels.
http://www.ewal.net/2013/08/15/bitcoin-mining-update-butterfly-labs-sc-singles/

I have also seen prototypes of the Waterblock, and modified end panels which offer 10db noise reduction which could help a lot.

@BTC-engineer:


Have you found a acceptable fan-replacement?

(oder hab ich das hier irgendwie überlesen... mein englisch ist nicht so lecker..) :-)

Gruss Z80

I did here: https://bitcointalksearch.org/topic/bfl-single-air-flow-286326

Pick a Noctua fan, which is claimed to last about 160,000 hours (who knows, maybe it's handy to have a working, second-hand fan at hand in 2029 ;-), it hardly makes any sound and you can mod your miner to stand in a vertical position (putting the fan horizontal) for even more efficient cooling.

And oh, btw, they're ugly pinkish with brownisch details. Imho still better than any led decorated fan...

Other than the plates, did anyone made any other mods that significantly reduced  the noise? What would be the quitest fans out there and is it even worth replacing them?
I would expect to at least half the DB, otherwise i'll just need to find a storage room to place it.

This thing is impossible to be kept in a room where people try to do something, it's like a jet fighter

I just wanted to comment on the fan plate set that I received from Germany yesterday.  First of all, I was pleasantly surprised to receive it in only 12 days considering it was shipped from Germany to Canada.  It was super-easy to install onto my Little Single -- only had about 5-10 minutes of downtime to remove the old fan plates and install the new ones.

I wanted some quantitative measurements of the impact the plates had, so I made some before and after measurements.  Sound level was recorded using a Radio Shack 33-2050 sound level meter (analog), set to "A" weight and slow response, facing the intake of the LS and spaced 20cm away from the unit.  The ambient room temperature is 21.4C.

Before:
  Sound Level: 74dB
  Temperature: 68C

After:
  Sound Level: 67dB
  Temperature: 61C

Not bad for such a simple modification!  I wasn't expecting a miracle - I mean, these units are LOUD and there's no getting around it.  Now it's slightly less loud (but still loud).  That's mainly why I keep it down in the nice cool basement - so nobody can hear it.  I'm guessing that replacing the fans with quieter models would help, too - but the more I mod this thing, the less ROI there will be to be had (and having only received it on Sept. 2, it's days are already numbered).

Anyways, just wanted to thank you for making these plates available and even if it's not making my hashrate go higher, at least it's running the unit at a cooler temperature which should help its longevity (or perhaps give more headroom for overclocking, if it ever becomes possible for lay-people).

I do indeed.  Now fixed in the original post.

I think you mean @BTC-Engineer, but yes, I was just about to ask this same question  

Just to say I bought a set of the fan plates on bitmit and am pleased with them.  Apart from looking better, they do reduce the noise from the airflow.

But don't expect too much of an overall noise reduction from this mod alone.  At least on my unit, the fan motor/bearing noise is significantly louder than the airflow noise - and of course the improved fan plates won't do anything about that.

@BTC-engineer:  any progress on finding replacement fans that run quieter without compromising the airflow?

roy

temp dropped at the place where this sensor is, but what is the temp near the chip where big fan sucks air out? what is the temp underside of pcb ?

watching

Just taking the whole cover off on my 2 reduced the temp by 5C each
It initially dropped 7C on one but levelled out at 5C for both.

It turned out that the MOSFET zone usually gets to be the hottest region on the PCB. As a result we use our temperature sensors on board for sensing temperature, otherwise the on-die temperature diode
is fairly easy to read (Just check the voltage drop across the diode and you have the temperature).


Regards,
Nasser

Need an air filter... that is going suck in the dust for sure.  https://www.bitcoinstore.com/accessories/air-filters.html

Gentle typhoon 1850 rpm 120mm fan should be able to reduce the noise dramatically while keep almost the same static pressure and air flow

It'd be nice to have a video that actually shows how much this improves the noise level and temp.