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infamousk12

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If I have a PWM fan controller (NZXT Noctis 450), then I don't need to buy PWM versions of the extra fans I'm using for push/pull right? Because I'll just be plugging them into the hub and the PWM will take over yah?

FYI using H115i and adding two Corsair SP 140 LED series fans.

Thanks!
 
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nitrium
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infamousk12

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Also, another dumb questions (newb here)

Once I have all fans plugged into the pwm hub, I plug the hub pwm cable into the Mobo CPU_Fan header right? This will ensure all fans are controllable thru the bios and will adjust to the CPU's temps yah?

Please tell me I'm not playing in right field here...
 
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nitrium

nitrium

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Yes, that is what will happen. Make sure you get fans rated at the same rpm though (i.e. don't mix 1200 rpm fans with 2500 rpm fans).

 
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infamousk12

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Yikes, do ALL the fans in the system need to be the same? (i.e. case and rad fans) Or just the Rad fans?
 
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nitrium

nitrium

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Well you kinda want to the fans to balance, and imo is essential for two on a push/pull system on a CPU cooler. A 2500 rpm fan will move a lot more air than a 1200 rpm fan (of the same size), so you don't want them to stress each other when they're supposed to be working together (i.e. the 1200 rpm fan might be hindering the higher airflow provided by the 2500 rpm fan, or alternatively the 1200 rpm is actually sped up by the 2500 rpm one - which is probably not good for the fan). For case fans it's a little less important, but still something that shouldn't be ignored entirely.

 
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infamousk12

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Hmmm...So my case fans that come stock with the case are three 120mm intakes at 1200rpm with 45cfm. A 140mm at the rear as an exhaust at 1000rpm with a 50cfm.

The cooler is Corsair h115i with 140mm fans ta 104.65cfm and 2000rpm, also with a static pressure of 3.99mm.

The add on fans I'm getting for the push/pull are the corsair sp140mm and those are rated 49.49cfm, 1.17mm static pressure and 1440rpm.

Am I about to commit a disaster or is the difference in the rpm not a huge deal? Also, I'm guessing the cfm on the rad specs is so high because it's the combined total of two fans?

I'm sorry for the long winded response, I just want to make sure I do it right. This is a first time build for me. Pleaseee have mercy
 
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nitrium

nitrium

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Just try and keep cfm's going in roughly on par with cfm's going out (the fan's speed and size isn't important for that - e.g. two 1200 rpm fans that do 45 cfm would be perfectly matched by a single 2500 rpm fan doing 90 cfm - the relative placement will provide sufficient buffer that the higher airflow from the single fan won't negatively affect the the two slower fans). Some people like a positive case pressure, where you have slightly more going in than out - I'm not a fan of this myself, but opinions differ. What I was getting at with my recommendation is NOT to put two 120mm fans of different speed on a CPU cooler in a push/pull - as I said it's less important for the case. I don't know anything about rad, so can't comment on that particular question.
 
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infamousk12

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Thank you for your help
 
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