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Author Topic: Antminer S9 - Actual CFM at full fan RPM  (Read 6569 times)
VentMine
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January 27, 2017, 09:29:58 PM
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Does anyone know what the difference in pressure is (inches or mm h20) across the Antminer S9 when running at full rpm?

I found the specs of the fans (QFR1212GHE-SP01) and the CFM vs deltaP and am trying to calculate the actual CFM through the miner when running at full RPM.

THX

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January 28, 2017, 01:37:13 AM
 #2

Does anyone know what the difference in pressure is (inches or mm h20) across the Antminer S9 when running at full rpm?

I found the specs of the fans (QFR1212GHE-SP01) and the CFM vs deltaP and am trying to calculate the actual CFM through the miner when running at full RPM.

THX

Why?  the firmware will insist you run a fan at 4000 or 4500 rpm if it is auto tune.  So it will stay noisy  on auto tune or just shut off.

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January 28, 2017, 02:02:21 AM
 #3

Does anyone know what the difference in pressure is (inches or mm h20) across the Antminer S9 when running at full rpm?

I found the specs of the fans (QFR1212GHE-SP01) and the CFM vs deltaP and am trying to calculate the actual CFM through the miner when running at full RPM.

THX

It's around 188 m³/h.

I thinking about use some Prolimatech Ultra Sleek Vortex 140mm, I know that its 166 m³/h, but I'm talking about ~20 dBa at full speed instead of ~75!
VentMine
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January 28, 2017, 04:40:42 AM
 #4

Does anyone know what the difference in pressure is (inches or mm h20) across the Antminer S9 when running at full rpm?

I found the specs of the fans (QFR1212GHE-SP01) and the CFM vs deltaP and am trying to calculate the actual CFM through the miner when running at full RPM.

THX

Why?  the firmware will insist you run a fan at 4000 or 4500 rpm if it is auto tune.  So it will stay noisy  on auto tune or just shut off.

I'm sizing some exhaust fans and was thinking to size them such that they can handle the maximum expected CFM of my farm. For example, if I have 40 x S9's and the max CFM per S9 is 180 CFM (for example), then I would want to ensure my exhaust fans can handle 40x180 = 7200 CFM. I figure this is a simpler way to size the fans rather than try to calculate via heat load and ambient temperature info, which may have a degree of error. Does this make sense or maybe you know of a better way? Smiley


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VentMine
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January 28, 2017, 04:44:44 AM
 #5

Does anyone know what the difference in pressure is (inches or mm h20) across the Antminer S9 when running at full rpm?

I found the specs of the fans (QFR1212GHE-SP01) and the CFM vs deltaP and am trying to calculate the actual CFM through the miner when running at full RPM.

THX

It's around 188 m³/h.

I thinking about use some Prolimatech Ultra Sleek Vortex 140mm, I know that its 166 m³/h, but I'm talking about ~20 dBa at full speed instead of ~75!

MrKaizer I'm wondering where you found this information, just for my reference? Seems like it is reasonable, based on the fan chart for the model QFR1212GHE-SP01 that comes with the S9, that CFM would correspond to a differential pressure of 18 mm of h20 or so, and falls right in the middle of the chart for the model.

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January 28, 2017, 08:57:00 PM
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The 6000 RPM delta fan and the Ultra Sleek Vortex 14 are in totally different classes, it won't work.  Delta is doing 210+ CFM at max speed, the vortex only 98CFM.  There is almost nothing comparable to Delta fans on these things.

There's a fan called the Scythe Ultra Kaze that runs at 3000 RPM, pushes a ton of air and is slightly quieter, but it only works if u have the non-autotune S9 and can downclock the frequency a bit.
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January 29, 2017, 12:38:42 AM
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MrKaizer I'm wondering where you found this information, just for my reference? Seems like it is reasonable, based on the fan chart for the model QFR1212GHE-SP01 that comes with the S9, that CFM would correspond to a differential pressure of 18 mm of h20 or so, and falls right in the middle of the chart for the model.

Sorry for my mistake, that information is from S7, no S9.

For the 6000rpm fan is around 210 CFM.
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January 29, 2017, 12:41:23 AM
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The 6000 RPM delta fan and the Ultra Sleek Vortex 14 are in totally different classes, it won't work.  Delta is doing 210+ CFM at max speed, the vortex only 98CFM.  There is almost nothing comparable to Delta fans on these things.

There's a fan called the Scythe Ultra Kaze that runs at 3000 RPM, pushes a ton of air and is slightly quieter, but it only works if u have the non-autotune S9 and can downclock the frequency a bit.

 YS Tech has fans that can argue with most Deltas, but none to my knowlage that can argue with the FFB series or it's derivatives like the QFR series - the YS Tech lines are designed to be competition for the Delta AFB "low backpressure design" series and it's derivatives.

 I'm not aware of anyone else that even gets CLOSE to 200cfm at the kind of backpressure the FFB/QFR/etc lines are designed for in a 120mm format.




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January 29, 2017, 01:14:57 AM
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 I'm not aware of anyone else that even gets CLOSE to 200cfm at the kind of backpressure the FFB/QFR/etc lines are designed for in a 120mm format.


That's pretty cool, didn't realize these fans were such boss

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January 29, 2017, 02:21:46 AM
 #10

YS Tech has fans that can argue with most Deltas, but none to my knowlage that can argue with the FFB series or it's derivatives like the QFR series - the YS Tech lines are designed to be competition for the Delta AFB "low backpressure design" series and it's derivatives.

 I'm not aware of anyone else that even gets CLOSE to 200cfm at the kind of backpressure the FFB/QFR/etc lines are designed for in a 120mm format.


I can't find any seller of those fans, can any of you please provide a link on eBay or Amazon?
VentMine
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January 29, 2017, 06:59:43 PM
 #11

So guys, still didn't get an answer to the topic yet. I'm aware of the specs of the stock fans that come with the S9, but I am hoping to find out what is the pressure differential across the fan so I can calculate the actual CFM through the S9 considering pressure drop across heat sinks etc?

 Tongue


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January 29, 2017, 10:39:42 PM
 #12

So guys, still didn't get an answer to the topic yet. I'm aware of the specs of the stock fans that come with the S9, but I am hoping to find out what is the pressure differential across the fan so I can calculate the actual CFM through the S9 considering pressure drop across heat sinks etc?
 Tongue
Probably because no one has measured the pressure differential. So -- get some clear flex PVC tubing and make your own manometer (google it -- very very simple) , poke a hole for access to the space between the fan and heatsinks and ya got yer answer.

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VentMine
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January 30, 2017, 01:59:56 AM
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Good idea, maybe I can finally contribute something useful to the community hehe. Will update with results Grin

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February 07, 2017, 10:22:27 AM
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The 6000 RPM delta fan and the Ultra Sleek Vortex 14 are in totally different classes, it won't work.  Delta is doing 210+ CFM at max speed, the vortex only 98CFM.  There is almost nothing comparable to Delta fans on these things.

There's a fan called the Scythe Ultra Kaze that runs at 3000 RPM, pushes a ton of air and is slightly quieter, but it only works if u have the non-autotune S9 and can downclock the frequency a bit.

If I may, the Ultra Kaze is good - but - Enermax Twister Storm is better @ 3500 RPM for +150 CFM / +11 Static Pressure. It's working great on my Spondoolies SP20E. I've also, in order, a possible new king of the road (non delta / low noise), the Silverstone FHP141-VF @ 2000 RPM for +170 CFM. It's a 140mm mounting as a 120mm, one catch - the Static Pressure seems to be around 4...
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May 23, 2017, 10:40:11 AM
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Hi guys,

i read about that the noctua NF-F12 are too weak for the S9. I have some on my S5 and the work like a charm!
So I try to figure out how I could get this S9 more silent.

I am thinking about taking 2 noctua nf-a14 industrialppc-3000 pwm and a fan adapter that downsizes from 140 to 120mm.
The nf-a14 industrialppc-3000 pwm has 269 CFM, so it should blow more air at 3000rpm as the original at 6000rpm with 210cfm.

What are you thinking bout this guys?

mine on!
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May 23, 2017, 12:14:56 PM
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i read about that the noctua NF-F12 are too weak for the S9. I have some on my S5 and the work like a charm!
Not tested this(Noctua NF-F12 iPPC-3000 PWM) on S9 but I'm not happy with them on S5:
http://i.imgur.com/WZEnmIC.png
Quite high temperature on low frequency, continuous work on 2880 rpm,  no magic. Maybe I'll test them with one big fan before go back to the original fans.
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May 23, 2017, 12:47:37 PM
 #17

Maybe you should put some new cooling paste onto your chips.
This dropped ym temps by 10°!
If your S5 still has its original colling paste on it, i think you should change it.
Cause after 2 or 3 years the paste isn't working well anymore.
Costs a bit of time and maybe 10-20€ for cooling paste but i think it's worth it.


And don't test the nf12 on the S9. They are way too weak for the S9 and will burn it!!
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December 22, 2017, 01:57:56 AM
 #18

Hi guys,

i read about that the noctua NF-F12 are too weak for the S9. I have some on my S5 and the work like a charm!
So I try to figure out how I could get this S9 more silent.

I am thinking about taking 2 noctua nf-a14 industrialppc-3000 pwm and a fan adapter that downsizes from 140 to 120mm.
The nf-a14 industrialppc-3000 pwm has 269 CFM, so it should blow more air at 3000rpm as the original at 6000rpm with 210cfm.

What are you thinking bout this guys?

mine on!

@voodooman you alredy try it? its working that NF-A14 industrial PPC?
i think is 269 m3/h wich is 158 CFM.
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December 28, 2017, 04:00:34 PM
 #19

Hi guys,

i read about that the noctua NF-F12 are too weak for the S9. I have some on my S5 and the work like a charm!
So I try to figure out how I could get this S9 more silent.

I am thinking about taking 2 noctua nf-a14 industrialppc-3000 pwm and a fan adapter that downsizes from 140 to 120mm.
The nf-a14 industrialppc-3000 pwm has 269 CFM, so it should blow more air at 3000rpm as the original at 6000rpm with 210cfm.

What are you thinking bout this guys?

mine on!

Noctua nf-a14 industrialppc-3000 pwm how can be fit with screw hole on S9 you think? There is something have any trick for it? Noctua nf-a14 and Noctua nf-a12 not the same? I thought the only matter is the size between with a12 - a14 models.
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December 28, 2017, 04:56:54 PM
 #20

I think you guys just need to accept the fact that you bought an INDUSTRIAL miner that makes lots of noise because its not meant to be ran at home. Every day people are posting on how to make the miner quieter. ITS NOT MEANT TO BE QUIET. Putting weaker, quieter fans on it will just cause you problems. Just accept that you did not do the proper research before buying it and now you have to deal with the consequences.

Also comparing an s5 to an s9 makes no sense. With each generation of chips the heat load increases by a ton so what works for an s5 has zero bearing on what will work for an s9.

Stop buying industrial miners, running them at home, and then complaining about the noise.
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