Question Pick a fan for radiator.

[gendalf]

advertised for "static pressure": https://www.idcooling.com/Product/detail/id/100/name/SF-12025-R
1.78mmH2O
62CFM
advertised for "airflow": https://www.idcooling.com/Product/detail/id/251/name/WF-12025-XT-R
2.1mmH2O
71.2CFM
has a picture of being used for static(CPU radiator): https://www.idcooling.com/Product/detail/id/334/name/NO-12015-XT BLACK
they don't provide mmH2O info
54.6CFM

So which one of the 3 above would be best on a radiator?
or is it better to buy a 90mm fan with even higher mmH2O?

 

[Phaaze88]

advertised for "static pressure": https://www.idcooling.com/Product/detail/id/100/name/SF-12025-R
1.78mmH2O
62CFM
advertised for "airflow": https://www.idcooling.com/Product/detail/id/251/name/WF-12025-XT-R
2.1mmH2O
71.2CFM
has a picture of being used for static(CPU radiator): https://www.idcooling.com/Product/detail/id/334/name/NO-12015-XT BLACK
they don't provide mmH2O info
54.6CFM

So which one of the 3 above would be best on a radiator?
or is it better to buy a 90mm fan with even higher mmH2O?

Scrolling down to 'maximize the cooling performance', it's there, at 1.53mmH2O. It's a 15mm thick fan, unlike the other 2, which are the usual 25mm.
Unless the scenario involves tight spaces that 25mm won't fit, the 15mm need not apply.

As for the other 2... on paper, the 2nd one is superior. But those specs are what they deliver at 100%rpm; fan performance below 100% does not scale linearly. Noise levels are another unknown variable.
Round frame fans aren't as good as square frame when pushing air through a radiator. On the other hand, the field levels out when pulling.
It's entirely possible for Fan 2 to move more air than Fan 1 under the right conditions.


TL;DR: Fan 2(speculative).

 

[JohnBonhamsGhost]

is it better to buy a 90mm fan with even higher mmH2O?

90mm would be removing less of the heat from the radiator fins vs 120mm because it would be limited to a smaller surface area.

why are you limited to these specific Id Cooling fans?
there are better manufacturers out there that have models offering better performance and lower dB.

 

[gendalf]

JohnBonhamsGhost, just what's locally available at reasonable prices, suggest better fans at the same price range, I'll see if I can find them.

 

[JohnBonhamsGhost]

what's locally available at reasonable prices

locally, as in available at a local store?

and what do you consider "reasonable prices"? many local stores and online vendors will be offering different prices for the same items.

generally, the cheaper the fans the lower the airflow and the higher the noise ratio.
so what's reasonable may not be the best option for this type of situation.

 

[gendalf]

What about this tl-r12 series: http://www.thermalright.com/product/tl-r12-w/
Rated Speed: 1500 RPM±10% (MAX)
Noise Level: 23 dBA (MAX)
Air Flow: 65.25 CFM (MAX)
Air Pressure: 1.99 mm H2O (MAX)
Connector: 4 PIN PWM
Bearing Type: S-FDB Bearing

is the design ok for pressure tho?
'Cheater' from 'fan showdown' has similar "boat-propeller" design and has the highest stats for both static and cfm, so I guess the shroud matters more, than the blade density.

 

[Karadjgne]

Fan #2 easily, and the stats are next to useless if taken individually.

The 2 best rad fans for many, many years were the Scythe Gentle Typhoon and the Noctua NH-F12. Neither had especially high cfm, nor did either have high SP. What they did have was a superior blade design that maximized the ratio of CFM to SP so that turbulence was minimal and what cfm there was was pushed through the fin restriction cleanly.

High SP does nothing if there's relatively little cfm and vice versa. If the fan is designed with a wide cone exhaust, the airflow hits the fins at an angle and creates turbulence, requiring massive amounts of SP to push it through. Too much turbulence and all that happens is the cfm ends up going sideways, out from between the fan and rad at the edges, and not through the fins. That's why round frame fans generally suck on a rad, no sealing edges.

Fan #2 by its very design will have better conal control, a straighter airflow exhaust and consequently put more air through the fins, regardless of its lower stats.

 

[gendalf]

Why is advertised dba on coolers and in reviews always so different (larger number in reviews)?
Is the advertised value even useful and can it be compared between brands?

 

[Phaaze88]

Why is advertised dba on coolers and in reviews always so different (larger number in reviews)?
Is the advertised value even useful and can it be compared between brands?

1)Because the testing environments, such as a case(if one was even used) and the distance they measure sound from will be different.
2A)The info is of limited use due to personal fan curves, distance away from PC, and the case design.
2B)No, because of #1.

 

[Karadjgne]

Sound changes with environment. Scream as loud as you can, and thats still quieter than a good shout through a 1950's Era cardboard megaphone. So sound inside one case might have amplified reflections, sound in another case might have nullified reflections, and that might change simply on whether the microphone was 12" away or 13" away, which changes the amplitude of the point of contact on the sounds frequency.

Which is why there's always a listing of methodology and equipment on every pro review, which is repeated for every review. To maintain consistency in testing.

 

[Crosslhs82x2]

Hi Guy's
Darkbreeze posted a link to some Arctic fans awhile back in his Lets talk about cases thread.

There's no led or rgb on them but these are cheap enough and have some pretty good looking stats.

https://www.amazon.com/dp/B09VDNKL4G

 

[Karadjgne]

Arctic are very decent fans, but fancy pwm's aren't going to work that well in this application. The motors in DC fans are built to take the higher amperage wear and heat of a constant load that's likely under some back pressure.