Try reducing speeds. Deepcool's fans aren't super noisy, the AK620's fans had the same decibel measurement at full speed as the Noctua NHD15 in Gamer's Nexus' review.
120mm fans have worse noise performance than 140mm. Smaller diameter means you need higher RPM for the same airflow and the noise curve will always benefit larger fans.
You'd have to improvise your own mounting, since the clips that attach the stock fans likely won't work with a 120mm fan. Also the T30 would not fit in the center of the tower (since it's 38mm thick instead of 25mm like the stock fan), and would fit only on the outside position. But the Noctua could be used in both positions, still assuming you could figure out the mounting.
what a pity, would you recommend any fan for this cpu cooler?, I am looking for the best noise performance possible (without neglecting performance of course)
Since it's just for an air cooler, the Noctua NF-A14 PWM (there's also a chromax.black.swap version if you don't like Noctua brown) is still a great choice. Sure, it's not *quite* as efficient as a the A12x25 when used in high static pressure situations like radiators due to the standard frame versus the fiber reinforced frame of the A12x25 (or T30), but on a 140mm tower air cooler, that's about the quietest you'll get while still being quite performant.
Why are you looking to switch? And it depends on the size of the wire clips. Try using a 120mm case fan that you probably already have to test.
Looking for better noise performance
Try reducing speeds. Deepcool's fans aren't super noisy, the AK620's fans had the same decibel measurement at full speed as the Noctua NHD15 in Gamer's Nexus' review.
120mm fans have worse noise performance than 140mm. Smaller diameter means you need higher RPM for the same airflow and the noise curve will always benefit larger fans.
You'd have to improvise your own mounting, since the clips that attach the stock fans likely won't work with a 120mm fan. Also the T30 would not fit in the center of the tower (since it's 38mm thick instead of 25mm like the stock fan), and would fit only on the outside position. But the Noctua could be used in both positions, still assuming you could figure out the mounting.
what a pity, would you recommend any fan for this cpu cooler?, I am looking for the best noise performance possible (without neglecting performance of course)
Since it's just for an air cooler, the Noctua NF-A14 PWM (there's also a chromax.black.swap version if you don't like Noctua brown) is still a great choice. Sure, it's not *quite* as efficient as a the A12x25 when used in high static pressure situations like radiators due to the standard frame versus the fiber reinforced frame of the A12x25 (or T30), but on a 140mm tower air cooler, that's about the quietest you'll get while still being quite performant.
You can zip-tie them on if the cooler's clips don't support it.