News post here.Noctua first showed off a prototype slim 120mm fan at Computex 2014, and at each Computex since they've shown off iterations of the design, but not this year. This year, Noctua has instead officially announced the fan, now designated the NF-A12x15 PWM and NF-A12x15 FLX (for the PWM and voltage-controlled variants respectively). So instead of prototypes, we will be taking a look at production versions of the fan at Computex this year, in person!
2x slim is 5mil more than 1x regular. It would be louder, but much more powerful airflow wise. I cannot say how much better it is at cooling due to diminishing returns.Would 2x of the slim fans be better on a radiator for push-pull configuration? Or is it better to keep a single 25mm one?
It depends. For most radiators, you want a fan which is pressure-optimized, like the ones meant for heatsinks. Most casefans are airflow-optimized. These slim fans seem to be airflow-optimized, as @Necere already mentioned. Because seemingly making slim pressure-optimized fans isn't that easy.Would 2x of the slim fans be better on a radiator for push-pull configuration? Or is it better to keep a single 25mm one?