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Topic: Antminer S9 - Actual CFM at full fan RPM - page 2. (Read 7361 times)

newbie
Activity: 11
Merit: 0
February 07, 2017, 05:22:27 AM
#14
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...
full member
Activity: 236
Merit: 105
January 29, 2017, 08:59:56 PM
#13
Good idea, maybe I can finally contribute something useful to the community hehe. Will update with results Grin
legendary
Activity: 3822
Merit: 2703
Evil beware: We have waffles!
January 29, 2017, 05:39:42 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.
full member
Activity: 236
Merit: 105
January 29, 2017, 01:59:43 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

newbie
Activity: 38
Merit: 0
January 28, 2017, 09:21:46 PM
#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?
full member
Activity: 236
Merit: 105
January 28, 2017, 08:14:57 PM
#9

 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
legendary
Activity: 1498
Merit: 1030
January 28, 2017, 07:41:23 PM
#8
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.



newbie
Activity: 38
Merit: 0
January 28, 2017, 07:38:42 PM
#7
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.
jr. member
Activity: 49
Merit: 3
January 28, 2017, 03:57:00 PM
#6
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.
full member
Activity: 236
Merit: 105
January 27, 2017, 11:44:44 PM
#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.
full member
Activity: 236
Merit: 105
January 27, 2017, 11:40:42 PM
#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

newbie
Activity: 38
Merit: 0
January 27, 2017, 09:02:21 PM
#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!
legendary
Activity: 4256
Merit: 8551
'The right to privacy matters'
January 27, 2017, 08:37:13 PM
#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.
full member
Activity: 236
Merit: 105
January 27, 2017, 04:29:58 PM
#1
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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