Originally Posted by TMatzelle60
I have the NH-L9i Low profile cooler and want to change it to a 25mm thick fan
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Color is not a problem either.
Before running out and getting a new fan, have you tried reversing the fan so it pulls air up and away form mobo & CPU instead of pushing it toward them? I've found more often than not using the fan to pull air up from cooler give significantly lower temps than pushing air into cooler.
Reason is pushing air in through cooler means hot air coming out toward motherboard turns out, hits RAM, GPU, I/O houseings etc. turning up past cooler & fan and is sucked back into fan.
With fan pulling out of cooler air flows over motherboard, up into cooler, fan and out side vents.
Even on open bench testing just turning the fan often lowers mobo and CPU temps by 5-8c
If we look at both at similar rpm (1550rpm vs 1600rpm) they have pretty much the same NF-A9 is actually a little less pressure and airflow. But I would probably get the NF-A9 because the additional 400rpm gives added performance. Don't believe the noise level ratings. They are are taken in open airflow environment. In use they will be much louder.