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Is using different fans for a CPU cooler a horrible idea?

post #1 of 6
Thread Starter 
Because if so, I should probably remove the generic, Molex 80mm one I added to my Deep Cool Iceberg Pro as a pull for the 92mm PWM one that came with the cooler, in a fit of desperation to get a few degrees more from the puny thing.

There's some backstory as to why I arrived in this situation, but I'm really way too sleepy to talk about it right now.





On a sidenote, would it be worth it to replace both fans with 120mm PWM ones using 120->92mm adapters?
     
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post #2 of 6
Having mismatched fans, mad damage the lesser fan, as the more powerful one is asking for more air, that the lesser cannot provide, it will suck/push the lesser away from it, putting stress on the bearings and axle/motor, possibly damaging them in the long term
     
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post #3 of 6
Thread Starter 
Quote:
Originally Posted by PedroC1999 View Post

Having mismatched fans, mad damage the lesser fan, as the more powerful one is asking for more air, that the lesser cannot provide, it will suck/push the lesser away from it, putting stress on the bearings and axle/motor, possibly damaging them in the long term

Thanks for the reply. I guessed as much. I was just really desperate to get a 2nd fan because I've been looking for the better part of a year, but 92mm fans are just not something that's sold here. =/

I had an idea, though; would replacing the single PWM 92mm fan on my cooler with two Molex 80mm fans (which I assume is constantly running at their full speed) be better in terms of cooling my CPU, or should I just stick with the single fan?
     
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post #4 of 6
I know of at least one CPU cooler that comes from the factory with mismatched fans, the Noctua NH-D14. Currently I have a Noctua NF-A15 on my Megahalems as a push fan and a Noctua NF-P12 as a pull fan. The NF-A15 is a PWM fan where my NF-P12 isn't so the NF-A15 runs at 1000RPM at idle and ramps up to 1200RPM at load. The NF-P12 stays at 1300RPM. I personally haven't had any issues with this configuration. The ideal setup would be 2 NF-A15's but I already had a spare NF-P12 and didn't want to spend the money on another NF-A15 right now.
post #5 of 6
Thread Starter 
Quote:
Originally Posted by Tyler Dalton View Post

I know of at least one CPU cooler that comes from the factory with mismatched fans, the Noctua NH-D14. Currently I have a Noctua NF-A15 on my Megahalems as a push fan and a Noctua NF-P12 as a pull fan. The NF-A15 is a PWM fan where my NF-P12 isn't so the NF-A15 runs at 1000RPM at idle and ramps up to 1200RPM at load. The NF-P12 stays at 1300RPM. I personally haven't had any issues with this configuration. The ideal setup would be 2 NF-A15's but I already had a spare NF-P12 and didn't want to spend the money on another NF-A15 right now.

@Tyler Dalton Would you happen to have CPU thermal benchmarks before and after your added 2nd fan? My own decision to try to modify my cooling setup was prety much done on impulse, and I wasn't able to observe the temps before the change. However, I do feel comfortable saying that when it's idle, the temps are lower than normal, but on load it definitely seems higher. In fact, the more I think about it, the more I feel the urgent need to swap the PWM 92mm fan I've got in push right now with another 80mm Molex fan currently in the front of my case.
     
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post #6 of 6
Quote:
Originally Posted by firagabird View Post

@Tyler Dalton Would you happen to have CPU thermal benchmarks before and after your added 2nd fan? My own decision to try to modify my cooling setup was prety much done on impulse, and I wasn't able to observe the temps before the change. However, I do feel comfortable saying that when it's idle, the temps are lower than normal, but on load it definitely seems higher. In fact, the more I think about it, the more I feel the urgent need to swap the PWM 92mm fan I've got in push right now with another 80mm Molex fan currently in the front of my case.

When I added the 120mm pull fan on my Megahalems, my temps improved under load about 2-3 degrees. If you have any other questions, just ask and I'll try to help any way I can.
Edited by Tyler Dalton - 4/8/14 at 7:39pm
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