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+ 1 for this fan recommendation for sure. Esp. for the CPU (front) fan which is pointing right at you if it's under your monitor etc. I have also just bought new versions of these stock fans on Ebay (a bit cheaper if buying in bulk) and found usually they are quieter than older fans (and are still ball bearing hi-Q fans) - but kind of luck of the draw, some of the stock fans are very quiet, some buzz like little bees, same with the used machines. Actually a little bit of creative lubrication can make a huge difference if you're mechanically inclined. But even at same dB, the Noctua seems to be a little more "pleasant" noise (basically sounds like a fridge running across the room - not enough to be distracting). It still comes to life if you encode video etc. lol, but that's to be expected. Definitely agree if it's task will be to do pro server stuff (reasonable for this hardware actually), just install the Noctua fans and call it a day.
FYI the 3 pin version of the Noctua (with a sharp pocketknife and some work on the connector)
can still work - but good tip to get the 4 wire version - I'd not found that option actually.
Also the i5 / i3's are definitely a little cooler / quieter with less cores. For daily driver desktop (non-gaming) duties, those processors make considerably more economic sense as well and you won't notice a darn bit of performance hit for 99% of daily driver tasks.