THE NH-L9I @ NH-L9A

Although both coolers are of the same line only their height and fan used are identical and so the NH-L9i measures 37mm in height, 95mm in width, 95 in depth and weighs 420g (with the fan).

On the other hand the NH-L9a is 37mm in height, 114mm in width, 92mm in depth and weighs a total of 465g (with the fan). 

Both models use the latest NF-A9x14 PWM 92mm fan which measures just 14mm in height and comes with special SSO2 bearing and flow channels on each blade. This allows the fan to achieve speeds of up to 2500RPM and output airflow levels of 57.5m3/h (33.8CFM) at 23.6dBA.

As always Noctua has placed their logo at the front aluminum fin.

Here we can see that the NH-L9i has a total of 56 aluminum fins while the NH-L9a has 68.

The base of both coolers is even and comes with a mirror like finish.