Pros: Push TONS of air, Anti Vibration mounts
Cons: Much louder than 18 dBA at full RPM
The specs listed on the box
The fan itself
The IXP-76-18 is able to push the amount of air that it does because of 2 things. The first being that it is obviously a thick fan. The second is a little bit hard to notice. The motor is much smaller than other fans. This allows the fan blades to be bigger which pushes more air.
Being thick, the fan has some compatibility limitations.
It will not fit on most heatsinks that use clamps. However, it should fit on heatsinks that use screws. I wont take any points off for this because the fan is designed to be thick, and you should know what you are buying.
Another big problem with the fan is the noise. It is by far the loudest component in my computer. It is much louder than the advertised 18 dBA. It is more like 2 or 3 times that at full speed. This is a problem as in order to get the sound down, you have to lower the RPM, which also lowers the CFM. This makes the fan like any other fan.
In an effort to lower the noise, SilenX has included some rubber mounting hardware
This helps, but does not remove the problem.
The fan offered a 2-3 degree performance increase when at full speed. When the speed was turned down to an acceptable level, the performance was identical to the stock fan.
I would recommend this fan to air cooling enthusiasts who do not care that much about acoustics.
I give this fan a 4/5 with the breakdown as follows