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For dual stacked radiator fans, should both fans be high static pressure?

2K views 14 replies 10 participants last post by  B NEGATIVE 
#1 ·
For dual stacked radiator fans, should both fans be high static pressure? That is, when a fan is placed on both sides on the radiator.

I'm not sure if both fans should have high static pressures or if only one or the other should have high static pressure.

Thank you!
 
#3 ·
Don't worry about a fan being static pressure or not, worry about whether a fan is good on a radiator or not. Imo people get way to caught up in spec symantics. Do the research and you will see which fans are the best on radiators and many of them never even mention static pressure in thier specs.
 
#4 ·
Quote:
Originally Posted by Radnad View Post

Don't worry about a fan being static pressure or not, worry about whether a fan is good on a radiator or not. Imo people get way to caught up in spec symantics. Do the research and you will see which fans are the best on radiators and many of them never even mention static pressure in thier specs.
Arent the good fans for radiators those that tend to have higher static pressure though?
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Quote:
Originally Posted by Megaqwerty View Post

For dual stacked radiator fans, should both fans be high static pressure? That is, when a fan is placed on both sides on the radiator.

I'm not sure if both fans should have high static pressures or if only one or the other should have high static pressure.

Thank you!
If you are going to use two different ones, I would personally put the higher pressure fan on the side blowing into/through the radiator. Though I would also just use all the same fans for simplicity sake. My favorite fans are the Noctua NF-F12 iPPC models at 2000rpm. Great cooling, not a lot of noise, can add a silencer to lower rpm a bit and greatly lower noise, and can be controlled with pwm, and they last a long time.
 
#5 ·
Quote:
Originally Posted by EniGma1987 View Post

Quote:
Originally Posted by Radnad View Post

Don't worry about a fan being static pressure or not, worry about whether a fan is good on a radiator or not. Imo people get way to caught up in spec symantics. Do the research and you will see which fans are the best on radiators and many of them never even mention static pressure in thier specs.
Arent the good fans for radiators those that tend to have higher static pressure though?
Static pressure isn't a fan specific design, it's an fluid dynamics theory, so technically all fans are static pressure fans. A good radiator fan doesn't really have anything to do with static pressure, it's the way and mechanics the fan is designed, AND the radiator that it's trying to cool.
 
#6 ·
Quote:
Originally Posted by Radnad View Post

Static pressure isn't a fan specific design, it's an fluid dynamics theory, so technically all fans are static pressure fans. A good radiator fan doesn't really have anything to do with static pressure, it's the way and mechanics the fan is designed, AND the radiator that it's trying to cool.
Honestly it seems like you are trying to throw out a bunch of technicalities to say "Im right! Im right!". You may be correct in that it takes more of the system as a whole, but that still doesn't negate the fact that when manufacturers state their specs, they list a static pressure rating. Those fans with higher ratings and still good ratings in the other areas also tend to be the best rated radiator fans. Feel free to take it up with people like Noctua if you dont like that they do a static pressure test for spec listing.
 
#7 ·
Quote:
Originally Posted by EniGma1987 View Post

Quote:
Originally Posted by Radnad View Post

Static pressure isn't a fan specific design, it's an fluid dynamics theory, so technically all fans are static pressure fans. A good radiator fan doesn't really have anything to do with static pressure, it's the way and mechanics the fan is designed, AND the radiator that it's trying to cool.
Honestly it seems like you are trying to throw out a bunch of technicalities to say "Im right! Im right!". You may be correct in that it takes more of the system as a whole, but that still doesn't negate the fact that when manufacturers state their specs, they list a static pressure rating. Those fans with higher ratings and still good ratings in the other areas also tend to be the best rated radiator fans. Feel free to take it up with people like Noctua if you dont like that they do a static pressure test for spec listing.
Dude, get over yourself, this has nothing to do with me, quit trying to draw a line in the sand and choose sides, see my first post that states "Imo". I'm trying to help the OP not overthink a decision on fans and just research which fans are best on radiators without a lot of hand wringing over marketing specs on a box.

Feel free to post this question in the air cooling thread and see what answers you get.
 
#8 ·
Quote:
Originally Posted by Radnad View Post

I'm trying to help the OP not overthink a decision on fans and just research which fans are best on radiators without a lot of hand wringing over marketing specs on a box.
So what makes a fan good for radiator use then? Like others in this thread, I figured that the best fans for radiators would be higher static pressure ones.
 
#9 ·
Quote:
Originally Posted by Megaqwerty View Post

Quote:
Originally Posted by Radnad View Post

I'm trying to help the OP not overthink a decision on fans and just research which fans are best on radiators without a lot of hand wringing over marketing specs on a box.
So what makes a fan good for radiator use then? Like others in this thread, I figured that the best fans for radiators would be higher static pressure ones.
Since doing the research is not something you seem to want to do, here is a list of fans that have proven over the years to be pretty much the best radiator fans.

1. Gentle Typhoons - still the king after all these years!
2. EK Vardars - very similar to the GT's, but they've had recalls and some people don't like the noise profile.
3. Noctuas - excellent radiator fans but not the quietest saw in the shop.
4. NB e-Loops - excellent fans in push but because of there special blade design have a horrible sound in pull.

Cheaper options:

1. Cougars
2. Phanteks
3. Bitfenix - I'm personally using these in my new Skylake build coming up and I have been really impressed with the performance for the price.
4. And of the course the always hotly debated Corsair SP's, although the new ML is shaping up to possibly make it into the top category above.

My sig rig is a perfect example why you shouldn't worry about static pressure when choosing a fan. I am running a Koolance 280 radiator with 30 FPI and using Corsair AF "Air Flow" (not SP) 140 fans (holy cow /gasp)! These fans are pushing through the top grill of my case also and usually run around 800 RPM under normal loads and my component temps are about +4/5c ambient. My pump is louder than the fans. Basically I'm breaking all the prescribed rules but it still works.

I hope this helps, and GL with your loop!
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#10 ·
Keep it simple for starters. Same fans on both sides.

Depending on FPI of radiator you are required or not to use high static pressure fans. For example for rads with FPI of 8 or 10 any fan will do (Noiseblocker XL1v3 is my personal favourite). Even on 16 FPI I'm running super slow fans (nominally 1500rpm but turtling along at 5.5V with 750 rpm give or take 20) without any adverse effect on the cooling. Granted I have 4x480 x-flow rads (2 are stacked) so I have plenty more cooling space, but I can run system at 500 rpms with minimal difference of perhaps 2C. I have also system with Scythe (full throttle!
biggrin.gif
) 500 rpm fans on 45mm 10FPI rads (Nexxxos) in push only. Working like charm.

For radiators of 20-30 FPI you have to use high pressure fans. There is plenty to choose from.
 
#11 ·
fans have rpm which is speed. and then there is the volume of air which it moves and that is determined by the pitch of the blade and the size of the fan. I worked in an industrial plant in south georgia that had 4 120 foot ovens used to bake the glue in 1 1/2 inch 13 layer plywood. we had 3 high speed fans on the top of each oven and the plant was always full of smoke. air specialists came in and mounted 4 bladed aircraft type blade fans instead of the 6 bladed thin ones and we were smoke free after they cranked up and you could feel the air flow from the floor 20 feet away sucking the smoke out of the plant.
 
#12 ·
Just slap an EK Vardar on it and be done. I twisted through a bunch of fans trying to find that perfect one, and it was staring me in the face the whole time. I mean, EK is a water cooling company, figure they'd make a good fan for rads. They have a weird pitch at higher RPMs, but if you can deal with your comp sound like a tiny vacuum cleaner, I think it's a fairly obvious choice.
 
#13 ·
Should always be the same whenever possible, and if you have a slower fan of the pair, it should not be the push fan. Although I have never run different speed fans together so I may have it flipped.
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~Ceadder
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#14 ·
Quote:
Originally Posted by EniGma1987 View Post

Honestly it seems like you are trying to throw out a bunch of technicalities to say "Im right! Im right!". You may be correct in that it takes more of the system as a whole, but that still doesn't negate the fact that when manufacturers state their specs, they list a static pressure rating. Those fans with higher ratings and still good ratings in the other areas also tend to be the best rated radiator fans. Feel free to take it up with people like Noctua if you dont like that they do a static pressure test for spec listing.
+1

this https://skinflint.co.uk/?cat=coolfan&asuch=&bpmax=&v=e&hloc=at&plz=&dist=&fcols=358&fcols=359&fcols=3953&sort=-filter3953&bl1_id=30 and some reviews (as a check) helped me a lot to find the right fan - for me the Enermax D.F. pressure PWM 120mm
 
#15 ·
Quote:
Originally Posted by EniGma1987 View Post

Honestly it seems like you are trying to throw out a bunch of technicalities to say "Im right! Im right!". You may be correct in that it takes more of the system as a whole, but that still doesn't negate the fact that when manufacturers state their specs, they list a static pressure rating. Those fans with higher ratings and still good ratings in the other areas also tend to be the best rated radiator fans. Feel free to take it up with people like Noctua if you dont like that they do a static pressure test for spec listing.
Except most specs on the box are utter garbage

Unless it has Nidec Servo or Delta etc on the box....

OP: It doesnt matter what fans you use but consider the noise signature will be very different to single fans or Push Pull and that the fans are not designed to run in a stack so you are not likely to know about potential issues with one fan 'driving' another. It was a common thing to do back in the day with heatsinks but I would urge push/pull over stacking tbh.
Quote:
Originally Posted by Radnad View Post

Don't worry about a fan being static pressure or not, worry about whether a fan is good on a radiator or not. Imo people get way to caught up in spec symantics. Do the research and you will see which fans are the best on radiators and many of them never even mention static pressure in thier specs.
This.
I use BeQuiet fans all the time,on paper not such a good fan, the reality is much different and the silence is awesome.
The mounting is a bit crap but otherwise a solid fan.
 
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