Definition: Given an Amazon customer review, write a title for the review. The preferred titles are under fifteen words.
Input: I replaced 5 of the fans that came with my computer case with just two of these fans. These fans are so efficient in delivering good air flow at such low rpm (800-1000) compared to my old fan setup. I have seen a dropped in at least a few degrees Celsius. These fans do cause a bit of vibration around 1100 rpm and above for a good reason. They deliver better CFM than any other fans at the same RPM. You will notice it more at the back of the exhaust than the intake. I use Speedfan to change my fan speed based on the CPU temp, not the cores since the adapter and bios is not good enough for changing RPM.

These fans are so efficient in delivering good air flow at such low rpm (800-1000) compared to ...