Closer Examination

The Cooler Master Mobius 120 is a standard 120 mm square frame fan that is 25 mm thick. This makes it almost guaranteed to fit inside every PC case intended to use 120 mm fans for airflow and cooling. This non-RGB version comes in a black and dark blue color scheme that is a subtle enough departure from the usual all-black fans to be noteworthy. The rotor and the silicone rubber pads on the corners get this color whereas the frame is black as seen above. The rotor has seven highly curved blades albeit with a design that does remind me more of an airflow-optimized design than a static pressure design for higher airflow restrictions, such as on a high fin density radiator. The blades are interconnected via a single ring structure circling the inside of the frame for added rigidity and stability and I've seen variations of this employed by others, including Blacknoise with its Noiseblocker eLoop series. There is no branding seen on the front and Cooler Master goes for a clean look with the simpler CM logo on the side. The fan corners are also open and the silicone rubber pads here will help prevent vibrations from travelling from the case to the fans or the other way round.


From the back we see the usual four straight stator vanes as well as a sticker on the hub confirming the Mobius 120 is rated for a max current draw at 0.12 A (including startup boost) and that in turn means ~1.44 W per fan if you go with these fans at full blast. Running the fans at slower speeds will of course consume less current off the 12 VDC rail, but suffice to say you should be able to run a decent number of these fans off a single 1 A fan header on your motherboard itself. Cooler Master does not provide further details about the motor inside although it does say the Mobius 120 uses something called a "loop dynamic bearing" which appears to be a sealed bearing using oil inside for self-lubrication. Refer to the product page for some depictions on the bearing itself if you are interested. The bottom line here is the bearing appears to be reliable and quiet enough to where Cooler Master is happy to provide five years of warranty! Given this has no RGB, there is a single cable coming from the fan motor hub on the back. The Mobius 120 fans are PWM only for fan control and thus we get a 4-pin connector at the end of a black-colored cable that is sleeved in a heatshrink application.