Noctua Industrials - Issues

Dirk Diggler

Dirk Diggler

Dirk Diggler

Soldato
Joined
6 Jan 2013
Posts
22,190
Location
Rollergirl
Current setup:

  • Phanteks Enthoo Luxe
  • X470-i (ITX)
  • 3700x
  • 1080ti (Founders)

Cooling (all Noctua Industrials A14 & F12)

  • Front - 2x140 intake
  • Base - 1x120 intake
  • Rear - 1x140 extract
  • Top - 3x120 extract

The problem is the top fans. I have a temp sensor situated in the middle of the case, and as soon as the top fans start to spin up the case & components get hotter. Is this down to the static pressure of the fans? Are these only for use with radiators?

I bought the Noctuas for cooling radiators but thought they would do a job for air intake/extract also?
 
Have you tested the actual probe.

I have them on my setup but never bothered to connect.

Does the temp equalise over time?
Is it hotter without them on at all?
 
At least forwardmost top fan draws out air which hasn't cooled any components lowering airflow available to cooling those.
Airflow in wrong place doesn't do any good.

Especially when that graphics cards blows out its heat and needs case intake airflow but not much of case exhaust.
So would also test with only rearmost top fan.
(and black colour doesn't make that NF-F12 any better acoustically)
 
The probe is tested and fine.

@EsaT that's interesting, I could be pulling the cool air that the front fans are bringing in, straight back out. Maybe I would be better having the top fans as intake? Or, possibly better just leaving them switched off? I'll test with one rearmost fan as suggested.

Related question: how many fans can we safely connect to a single motherboard header?
 
Having "positive pressure" (more intake than exhaust) inside case would help job of graphics card's blower cooler.
Also that case has so much hole in rear higher negative pressure might be drawing back in some of the heat blown out by GPU cooler.

That rear hole area could be also used to increase airflow around graphics card by using some top fans as intake to force more air out from rear.
Though rearmost top fan would just push air directly into rear fan without helping overall cooling.


Quite hard to find firm data about current output of motherboard fan headers, but at least at one time 1A used to be common.
It's just better to leave safety margin especially when dealing with such unknowns.
So let's cut that down by 30-40% to give some worst case breathing room.
Most fans have current specified, so calculate from that what different number of fans would draw.

Also in case of using PWM control there's limit how much current signal output can pull and at some point PWM signal starts becoming ambiguous for fan's control logic.
But three/four fans should be sure bet always.
 
Personally I found ambient case temperatures best with a straight across airflow pattern. Have a fully water cooled CPU/GPU setup with 360mm in front and 120mm rear radiators. I had a 120 and 140 fan in the top of the case.

I tried all sorts of combinations of intake and exhaust, in radiators and roof fans. Temperatures varied 1-2°C. But when I disabled the roof fans and closed vents, with front intake and rear exhaust config, case internals must have dropped almost 10°. Measured via chipset temperature but also I have the Alphacool Nexxxos GPU block which is a giant aluminium heatsink. That went from almost painful to touch, to just toasty.

I'm fairly convinced that totally linear airflow is the ideal if you want to catch every component/case region.
 
LuckyBenski said:
Personally I found ambient case temperatures best with a straight across airflow pattern. Have a fully water cooled CPU/GPU setup with 360mm in front and 120mm rear radiators. I had a 120 and 140 fan in the top of the case.

I tried all sorts of combinations of intake and exhaust, in radiators and roof fans. Temperatures varied 1-2°C. But when I disabled the roof fans and closed vents, with front intake and rear exhaust config, case internals must have dropped almost 10°. Measured via chipset temperature but also I have the Alphacool Nexxxos GPU block which is a giant aluminium heatsink. That went from almost painful to touch, to just toasty.

I'm fairly convinced that totally linear airflow is the ideal if you want to catch every component/case region.
Click to expand...

Makes sense, I take it by "closed vents" you mean blocked off the top of the case? I'll give that a try, too.

And yes, the 10C difference is just about what I'm seeing.
 
String said:
Current setup:

  • Phanteks Enthoo Luxe
  • X470-i (ITX)
  • 3700x
  • 1080ti (Founders)

Cooling (all Noctua Industrials A14 & F12)

  • Front - 2x140 intake
  • Base - 1x120 intake
  • Rear - 1x140 extract
  • Top - 3x120 extract

The problem is the top fans. I have a temp sensor situated in the middle of the case, and as soon as the top fans start to spin up the case & components get hotter. Is this down to the static pressure of the fans? Are these only for use with radiators?

I bought the Noctuas for cooling radiators but thought they would do a job for air intake/extract also?
Click to expand...
Makes sense to me. It's the reason I advise removing all PCIe back slot covers to increase rear vent area thus having better front to back airflow and less GPU heated exhaust mixing with cool air going to CPU cooler .. and to not use top fans at all. Your top fans are are pulling cool intake air that you want going to CPU cooler up and out of case. That air is then replaced by heated exhaust air coming off GPU. End result is warmer/hotter air into cooler resulting in higher temps .. because every degree warmer air temp is into cooler is same degrees hotter that component will be. ;)

I would first remove PCie back slot covers, unplug top fans and see what happens. Then try laying magazine or books over top vent and see it that helps even more. That way you only need to unplug fans to find out what the differences are. ;)

You might find below link to basic guide to optimizing case airflow of interest:
https://forums.overclockers.co.uk/t...-i-put-my-temp-sensor.18564223/#post-26159770
 
String said:
Makes sense, I take it by "closed vents" you mean blocked off the top of the case? I'll give that a try, too.

And yes, the 10C difference is just about what I'm seeing.
Click to expand...
Yep, bequiet Pure Base 600 has a pop up cover for the top grille. I prefer it closed anyway as my PC is off a lot and it stops dust settling into the case.
 
Usually 1A for fan headers
Ones marked pump/AIO
Or high amp
Usually 2A sometimes even 3A
Anything over 2 fans on one 1A
Header I prefer using
A fan hub with its own sata
Or molex power
As spinning the fans up usually
Takes more power
Than once they are running
 
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