Is this a good replacement fan for my Corsair 115i?

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The fan profiles and controller use PWM duty cycle to control the fans. They report the RPM to the software, but do not use it when determining how to run the fan. This is commonly referred to as an open-loop control system.

Basically, the controller delivers some percentage of the maximum power the fan can draw (PWM duty cycle), and the fan uses that to run.

As a result, 50% duty cycle on the Corsair fan would result in an RPM in the range of 950 to 1250 RPM depending on the environment it's in. The same 50% duty cycle on the Noctua fan would result in an RPM in the range of 1400-1650 RPM.

The result is that...
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junkeymonkey

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one thing I would look at is the fans CFM rate.

if the 115i was designed to be used with a 50 cfm fan and you put a 25 cfm fan in its place it may not ''push'' enough air through the raadator ay any given RPM and affect proper cooling efficiency.

''Fan airflow: 104.65 CFM. '' and at 2000 rpm

http://www.corsair.com/en-us/hydro-series-h115i-280mm-extreme-performance-liquid-cpu-cooler

your linked fan gives that in m³/h so you have to convert to cfm

that's just my opinion I would not worry about RPM as long as the CFM are close to the same a 1600rpm @ 104 cfm+/- will do as good as a 2000 rpm @ 104 cfm +/-


269,3 m³/h = 158 cfm @ 3000 rpms [your replacement fan]

http://www.convertunits.com/from/269.3+cubic+m/hr/to/cfm

should be fine if that's true
 
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junkeymonkey

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Other Thoughts: I replaced the radiator fans on my Corsair H115i. Big difference. I've gained 400-500 max rpm and already notice a difference at lower speeds. I'm thinking of replacing the fancy led fans in my case with Noctua fans.

All go, no show, high static pressure radiator fans. As quiet as it gets for such airflow. Don't be a cheap b@stard and complain about the price. Especially when you are spending more than a grand on your rig.

https://www.newegg.com/Product/Product.aspx?Item=N82E16835608048

looks like a lot of guys used that fan as a replacement and like them on there coolers only common con is 'Cons: Nothing! Perhaps a bit LOUD on max speed ''

at 158 cfm should not need to run at max anyway
 
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Tax6132

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So you think the fan i linked has enough air flow to out preform the stock fans?
 
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the nerd 389

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The Noctua fans you posted a link to are a very significant upgrade in airflow. They are also quieter than the fans that come with the H115i if you run them at the same airflow.

There are no disadvantages from switching to the Noctua fans with that cooler (other than price).
 
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fishburger

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Today I changed all my fans in the Corsair case type 650 and my corsair h110i cooler to Noctua 140mm fans type NF-A14 PWM premium,and what a difference,playing bf4 at 3440\1440 at 1oohz and ultra settings,cpu at 120fps max temp 55 c,and the noise from the case is close to zero ,only as small hum from the 1070 gpu. 5 fans in total 125usd including freight.and they work with corsair link4
 
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the nerd 389

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The cooler does not use a closed-loop fan controller. The fan curves are in terms of PWM duty cycle. Performance per RPM is therefore largely irrelevant in this case.
 
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junkeymonkey

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'' Performance per RPM is therefore largely irrelevant in this case. '

is that right hmmmmm.... explain all that

what I show is the Noctua if set for just 2000 rpms will supply the same amount of CFM as the stock fan is at its 2000 rpm 104

sounds pretty irrelevant to me when you need to know if the fan is going to give the same speced air flow at any given rpm weather its 1 rpm or 1 million rpms ,don't it ???

they both do .052666 cfm at 1 rpm +/- 1
 
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the nerd 389

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The fan profiles and controller use PWM duty cycle to control the fans. They report the RPM to the software, but do not use it when determining how to run the fan. This is commonly referred to as an open-loop control system.

Basically, the controller delivers some percentage of the maximum power the fan can draw (PWM duty cycle), and the fan uses that to run.

As a result, 50% duty cycle on the Corsair fan would result in an RPM in the range of 950 to 1250 RPM depending on the environment it's in. The same 50% duty cycle on the Noctua fan would result in an RPM in the range of 1400-1650 RPM.

The result is that at 50% duty cycle, you get roughly half of the fans available performance, no matter what the maximum RPM is. Thus, performance per RPM is largely irrelevant in this case. The only relevant metric is maximum available performance, and to some extent, the minimum supported duty cycle.
 
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