SPCR

I need to replace the 140mm fan on my 10 year old Noctua D14 heatsink, it's starting to tick when set the motherboard flat, as opposed to when standing vertically when in the Silverstone FT02b... i guess the bearings wore down to the vertical positioning and are now uneven when used horizontally...

I'm thinking of a Noctua A12x25 fan up front, and aa A14 in the middle

Or would be 2-3 A12x25 be a better noise/airflow choice? Apart from being more costly.....