Review on Wathai 80mm USB Fan 5V - Computer Laptop Router DVR Xbox Cooling (Pack of 2) by Johnnie Bowlan

I still feel that the dual 40 x 40 x 10mm airflow capacity mod I bought from Wathai isn't bad for the configuration I envisioned have. But the noise level is probably even more unstable than the 40x40x20 bought from them a year ago? I would recommend a possible 40 x 40 x 15mm modular upgrade, perhaps to overcome some of the vibrations of noise level instability and perhaps also to increase airflow by a few cubic feet per minute.