Topic: Bitmain S5 Replacement Fan - page 3. (Read 4644 times)

Yes, I have (ended up doing this). 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.

Fan stacking is more marketing hype than a viable cooling technique, don’t think you can get twice the airflow – if you’re lucky, MAYBE an additional 20%.


 When stacking two fans, the theoretical max airflow will be the same, but theoretical max pressure will double. From what people are saying about how small a performance increase they get, one could guess the airflow with just one fan is closer to max airflow than to max pressure.

So stacking a fan doesn’t help much. Adding a fan in parallel would more likely help, but the airflow will far from double. This is because to double the airflow through an obstacle, one must also double the pressure (so actually 4 fans are needed).

https://www.youtube.com/watch?v=VUbpb23yTK8


Also you'de be better off setting the case to "push/pull like this    out <*#s5#*< in     That way the air in and out is balanced and they are not fighting or creating areas of high or low pressure...
The biggest loss in the airflow game is unbalanced airflow in & out of the case. If you put in too much air you create a high pressure zone in your case and the fan has to fight this pressure to get the air across the fins. This is why sealing the top of the case result in lower temps.

 I personally helped a friend using Duct tape and Plasticard build a "lid" for his S5.. it dropped for him over all 2 degrees but that was with a single fan and not the push pull as described. More important for him it made for a Quieter over all system.

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

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.

 I was wondering to so i looked it up . .
Max. Air Pressure:    

1.412 IN H2O
35.877 mmH2O


mmH2O   Millimeters of Water (unit of pressure)



mmH2O

Also found in: Encyclopedia.
Acronym   Definition
mmH2O   Millimeters of Water (unit of pressure)
Copyright 1988-2014 AcronymFinder.com, All rights reserved.



Various versions feature a combination of unique properties such as ultra-low weight and stretchiness, or enhanced moisture permeability and water repellency up to pressures of 10,000 mmH2O or greater achieved through special lamination.
China,Japan : Nantong Teijin to Present High-performance, ... by Mena Report
5mm, the height is 11mm, and the value of the air pressure drop is 16 mmH2O, Fig.
Determination of the optimal design parameters for the wavy air fins ... by Ilies, Paul; Naghi, Mihai; Mare, Ciprian; Sucila, Marius / Annals of DAAAM & Proceedings
This fine denier spunbond fabric of 17 gsm reaches 100-140 mmH2O hydrostatic head, which complies with most of the market requirements for barrier leg cuffs with no melt blown layer between two spunbond layers.

 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

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.

Get a Delta 35.877 mmH2O vs 16.9MM-H2O :p  the key in the weay we use these fans is really is the MM-H20 over the CFM.... but then again who cares as long as the machine doesn't over heat

I believe that's the physical hardware max. At 4,000 rpm (the most I've seen the fan spin), it's 178. More here:

https://bitmain.zendesk.com/hc/en-us/articles/203966299-S4-Parts-Spec

http://www.amazon.com/Koolance-FAN-12038HBK-184-Fan-120x38mm-184CFM/dp/B0050UP8HK

• Dimensions: 120x120x38mm
• Type: Dual Ball-Bearing
• Connector: 3-pin (3-wire with tachometer)
• Rated Voltage: 12VDC
• Current: 2.0A
• Speed: 4000RPM (max)
• Static Pressure: 20.4mm-H2O
• Airflow: 183.5CFM (max)
• Noise: 59.00dBA (max)
• 50k hours MTBF
• Type: Dual Ball Bearing

Yup, that's exactly what I ordered from amazon - arrives on Monday. On the stock fan I'm running at 48-59C for a 350-400 frequency. The room ambient temp is kept at 21C. If I can stay under 65C with the Delta I'll be very happy. I know it pushes less CFM than the stock fan, but hopefully it does enough.

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

@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

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.

NO Sir NOT AT ALL, IT DEPENDS ON BLAE PITCH... A 200RPM fan could be moving MORE air based on the blade pitch....

Please don't spout off about things you have no clue about.




UNLESS This is the fan:

http://www.amazon.com/Koolance-FAN-12038HBK-184-Fan-120x38mm-184CFM/dp/B0050UP8HK


Then we are talking ~180CFM.... but these would make the S5 as loud as a room full of people talking (As loud as an S4/S4+)


Can you get me any information Off the Physical fan? I know its a 12038

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.

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.

if you look at what i posted i also use a delta fan with 151  CFM as push i wouldn't use the Silverstone alone or it will get hot fast and I use the Silverstone on the P setting not Q .

Vorta, did you do any fan mods?@

140mm just means you're sending more air around the heatsink, not through it.
If your thermistor reads 75-78°C I can promise you that the chips at the back of your miner are at 95°C or hotter.