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Thank you kindly for the information but I am looking for specifics.  Current Model, Current Model CFM, Where to Purchase Current Model.

Everything that I have seen about replacing the with a different model has lead to higher temperatures.  Is this the case or have I been reading the wrong posts?

Hello

I have this fans

Silverstone Tek 140mm x 38mm Fan for CPU Cooler and Computer Cases Cooling FHP-141

but Antminer on 350 mhz have the 75-78C temeperature
More overclocking is impossible

but the sound is much less
but the room quickly heated as the air coming out is much hotter

Hello

I have this fans

Silverstone Tek 140mm x 38mm Fan for CPU Cooler and Computer Cases Cooling FHP-141

but Antminer on 350 mhz have the 75-78C temeperature
More overclocking is impossible

but the sound is much less
but the room quickly heated as the air coming out is much hotter

Hello

I have this fans

Silverstone Tek 140mm x 38mm Fan for CPU Cooler and Computer Cases Cooling FHP-141

but Antminer on 350 mhz have the 75-78C temeperature
More overclocking is impossible

but the sound is much less
but the room quickly heated as the air coming out is much hotter

I believe the one that comes with S5 is around 4000 RPM.   That fan appears to be around 2000 RPM.  It's essentially cutting your cooling from fan in half.

If your wanting to do less on fan you really need to do a push/pull combo.   I would recommend putting on original fan till you get another of other to test push/pull.

78C is just getting pretty hot.  And pushing it pretty hard.

I thought for sure that somebody would know the make/model of the OEM fan.  Sounds like it is a variable speed 4,000 RPM 120mm fan but without the specifics I'm not sure if a replacement is good/better/worse.

From a previous discussion, this was said to be the stock fan specs:

Dimension: 120*120*38mm
Voltage: 12V
Start voltage: ≧8V (Power ON/OFF)
Power consumption: 1600RPM 1.68W / 4000RPM 25.8W
Rated current: DutyCycle 100% @ 2.15A
Air Flow: 4000RPM @ 178.3CFM (Max be 239CFM)
Noise: 4000RPM @ 56.7 dB-A (Measured in a Non-EchoChamber)
Life Expectancy: 40,000 hrs @ 25℃  (May degrade faster at higher temperature)
Connector: 2510-4P

Also, I recently tried a dual 60CFM fan setup (one for push, one for pull), but it was clearly not powerful enough - temps were at 70C within a few minutes. This is what I used:

http://www.newegg.com/Product/Product.aspx?Item=N82E16835553008

I just ordered the following Delta and am hoping I can use it alone for just push:

Delta Electronics AFB1212SHE 120x120x38mm Cooling Fan, 151.85 CFM, 58 dBA, 3700 RPM, 1.06 AMP, PWM 4-pin connector.

I have the miners running in a temp controlled room with proper ventilation, which helps the temp's, but I'm still worried if the Delta might not be enough as 2x 60CFM was clearly not even close.

@amelen

That is a great find!  Thank you.  Please let me know what the results are!!!!  Here's the fan on Amazon
http://www.amazon.com/gp/product/B004Y1HLA8/ref=as_li_qf_sp_asin_il_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=B004Y1HLA8&linkCode=as2&tag=120mm-fans-20&linkId=5HKYNDGQB3P4D62Z

@amelen

That is a great find!  Thank you.  Please let me know what the results are!!!!  Here's the fan on Amazon
http://www.amazon.com/gp/product/B004Y1HLA8/ref=as_li_qf_sp_asin_il_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=B004Y1HLA8&linkCode=as2&tag=120mm-fans-20&linkId=5HKYNDGQB3P4D62Z

Whats the Air Pressure?    My delta at 252CFM is: 1.412 IN H2O 35.877 mmH2O

Max be 239CFM  That's very close to my Big boy deltas I use to cool my radiator for my OC i7 3930k~ 4.7ghz.....
Whats the Air Pressure?    My delta at 252CFM is: 1.412 IN H2O 35.877 mmH2O

What do you mean by "1.412 IN H2O 35.877 mmH2O".  I'm sure you make sense.  It's just that I know the lingo.

What do you mean by "1.412 IN H2O 35.877 mmH2O".  I'm sure you make sense.  It's just that I know the lingo.

 1.412 Iches of H2O
Or
 35.877 milmeters H2O

Often called a 'head' of water

 It is the pressure required to support a water column of the specified height. It is equivalent to 9.80665 Pa, using the equation:

    P = ρ·g·h/1000
 

or TL/DR how hard the air coming from that fan is pushing

It refers to how much resistance the fan can overcome while moving x-amount of air. In our case, the resistance comes from pushing the air through the narrow passageways of the heatsinks. Another term for it would be back-pressure.

The higher that resistance the harder the fans has to work to move air through it.

Fans for miners or any other device with high-density fins on the power devices have to over come a substantial back-pressure to be able to move the required airflow through the heatsinks.

By and large to produce high pressure a fan either A) has to be fairly thick to control how much air leaks between the fan blades and the housing. Is why most PC fans @ 25mm thick suck at producing any real pressure. Miner fans are generally >35mm thick. Or B) the other way to get the pressure is speed. Put the 2 together and yer Golden.

You guys seem pretty knowledgable.  How would 2 fans stacked together work?  Twice as good, waste of a fan or total disaster?

Vorta, did you do any fan mods?@

Yes, I have (ended up doing this (https://bitcointalk.org/index.php?topic=1072176.0)). 2x Scythe Ultra Kaze (push-pull) has proven to be the best in airflow vs. sound ratio. You'll also be able to overclock your miner.


Push-pull combination will always work better than any push-only configuration on the S5 because of a lot of air escaping the heatsink before reaching it's end. I would recommend not buying Deltas as they are very loud. I would also not recommend overclocking the miner while using only one fan. Unless you have an infrared thermometer to monitor the temperatures of chips in the back of the miner ensuring they don't go over 90°C as you're testing the frequencies.

Sounds as though BitMain should have put the thermostat at the back of the unit because those chips get so much hotter.

or smartly... run the fan from the back to the front :)

Wouldn't doing that just make the other end of chips run higher? Whichever end is further from the fan will just run hotter, no?

@amelen

That is a great find!  Thank you.  Please let me know what the results are!!!!  Here's the fan on Amazon
http://www.amazon.com/gp/product/B004Y1HLA8/ref=as_li_qf_sp_asin_il_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=B004Y1HLA8&linkCode=as2&tag=120mm-fans-20&linkId=5HKYNDGQB3P4D62Z

Push Pull? or stacked?

I use this:  two pieces per S5
http://www.noctua.at/main.php?show=productview&products_id=78&lng=en (http://www.noctua.at/main.php?show=productview&products_id=78&lng=en)


Size      120x120x25 mm
Connector      4-pin PWM
Bearing      SSO2
Blade Geometry      Heptaperf™
Frame Technology      FocusedFlow™
Rotational Speed (+/- 10%)      2000 RPM
Min. Rotational Speed (PWM, +/-20%)      450 RPM
Airflow      121,8 m³/h
Acoustical Noise      29,7 dB(A)
Static Pressure      3,94 mm H2O
Max. Input Power      1,2 W
Max. Input Current      0,1 A
Voltage      12 V
MTBF      > 150.000 h
Scope of Delivery      
Fan
4 Fan Screws
Warranty      6 years
Ingress Protection      IP52
Material      Fibre-glass reinforced polyamide
Motor type      Three-phase

But if you want more cool so I recommend this already but the noise level is insufferable:
http://www.noctua.at/main.php?show=productview&products_id=80&lng=en&set=1 (http://www.noctua.at/main.php?show=productview&products_id=80&lng=en&set=1)


Size      120x120x25 mm
Connector      4-pin PWM
Bearing      SSO2
Blade Geometry      Heptaperf™
Frame Technology      FocusedFlow™
Rotational Speed (+/- 10%)      3000 RPM
Min. Rotational Speed (PWM, +/-20%)      750 RPM
Airflow      186,7 m³/h
Acoustical Noise      43,5 dB(A)
Static Pressure      7,63 mm H2O
Max. Input Power      3,6 W
Max. Input Current      0,3 A
Voltage      12 V
MTBF      > 150.000 h
Scope of Delivery      
Fan
4 Fan Screws
Warranty      6 years
Ingress Protection      IP52
Material      Fibre-glass reinforced polyamide
Motor type      Three-phase

These fans are expensive but indestructible.
Corsair example, I broke when I accidentally tapped a finger in the propeller.
when I have tapped into Noctua, much it hurts and fans held as of stone.

Just 1 delta as a push. It's specs were close to the stock fan, so I was hoping it would do the job. After about 1h of testing it doesn't look awful, however one S5 is overheating only on one side (the other one is proportionate). Not sure what could be causing it - the fans are identical and were installed exactly the same way.

What temp's are you seeing with those fans?

Can I see Pictures ???

anyone know the size screws needed for the stock fan? gonna add a pull fan to the back. wanted the same screws.

I had to remove the black screws to get the Delta to fit flush. One unit running 60C/60C, the other 63C/55C, still not sure why it's uneven. The heatsinks got slightly bent while I was taking it in/out, but I got them almost back into the stock position. Not sure if the heatsinks would be causing such a temperature imbalance?

http://www.alexmelen.com/bitcoin/s5-2.jpg

Yes, open case. Going to try the Delta as push and stock as pull, but I think that will use more power than I wanted and will be louder than stock.

No idea, then Closed case will make them run coolest as that forces air where it needs to be

What's the cheapest/easiest way to close the case up?

Cardboard and Duct tape......

On the type of screws, the fans are these (pick whatever length you want, this is what I use with a spacer):

http://[Suspicious link removed]/1FLWefa

and FWIW, these are what the rest of the case are:

http://[Suspicious link removed]/1AYeera

As far as temps - the first and easiest thing to do is add a spacer between both the push and pull fans and the case - doing this dropped my temps by about 2c.

As far as enclosure, I made one this weekend that is very nice on my laser cutter, and did a bunch of testing with my thermal camera to see how it changed temperatures, etc - and I will tell you that it won't drop your temperatures anything really in the standard configuration.  What you do gain are some alternative configs - so for instance, when you look at the thermal characteristics of the board when running, the front (where the fan is) is substantially cooler than the back - which makes sense, the front is getting fresh cool air, while the back just gets what it gets.  When you tweak it to push/pull, then it gets better overall, since the case is so open the rear fan sucks in fresh air from all the gaps in the case.  If you put it in a full enclosure though, now you might see better indicated temperature from their onboard sensor due to better airflow - but the overall board temps go up slightly.  I also found that push/pull becomes far less effective in this case, and actually found pull-only to be better than push-only... This has the added bonus of making the intake exposed, so easier to clean the grill and stop debris from building up (that I've seen on several used S5's I've purchased).  I'll be posting a thread at some point in the next few days with a bunch of pictures for anyone else who is interested. 

I should also say I'm doing all my testing using the Ultra Kaze:

http://[Suspicious link removed]/1cH0rta

My fan of choice for the S5 - I think it's a good balance between noise and airflow, and I prefer an always on fan than a PWM-controlled fan.  That's not to say this fan is even remotely close to the performance of the stock fan - they're hard to beat, or more accurately, I haven't been able to beat them yet.

55 degrees Celsius in the room where it is 22 degrees or less.
but even if they increased the room temperature at 30 is really not more than 65 on S5.

You're using 2 Ultra Kaze's per S5? What are your temps like?

Have you tested pull-only with the open case? That was one thing I wanted to test but didn't get a chance to. I wonder if it would cool better than push.

My 3rd number there is just two fans in push/pull - the spacers are just small fan cutouts that make it so there is some sealed space between the fan and the case, for better airflow.  I tried the push/pull with the case, but the results were marginal so I didn't even bother recording it.

I also tried pull only without a case, but that under performed push only - both don't cool the opposite side nearly as well, but push was less bad.  ;)

As far as partial enclosure, I first tried a sealing up the top and bottom of the heat sink - not quite as fancy as the 3D printed on that someone else did (which looks awesome).  The affect on temps was like 1c lower, whereas when you enclose the sides it makes a much larger difference.  The way I made my top, it rests on the top of the PCB's, so it effectively seals off the heat sink channel as well.

In my opinion the key to have a cooler s5 with other fans is how thick they are. If you have notice the stock fan is very thick. This has the result to pull out more hot air and very fast. I dont think anyone will see low temp with any other thin fan.

New fans came - did various testing. In all scenario's, with a good push fan (160cfm min), adding a pull fan only lowers temps 1-2C.

Open case? closed case? Push/Push? Pull/Pull??? Push/Pull?

Did you read about a page back when we talking about Static Pressure?

But as soon as I disconnect the stock fan it starts beeping. What can I do?

Try to update a firmware. Here at my work an S5 was running with no fans connected to the I/O board at all (2 fans were connected over MOLEX to 3pin adapters directly to PSU).