First, I know that the Enermax 82+ series (I favor the 525W modular one) power supplies have a proprietary fan, so swapping isn't easy.
I have read that the 425W version is lousy, fan-wise, and other versions' fans become noisier after several months, so I want to be future-proof.
I plan to control the replacement fan with my Scythe Kaze Master, have it at about 500 rpm at low load and 700 rpm when gaming.
Due to the high efficiency of the Enermax and maximum load of about 220W (after I get an 4850 and put an S1 on it), 700 rpm should be fine.
But I don't know if the PSU would start if it can't detect it's own stock fan spinning. Someone can clarify this for me?
Also, in your opinion, which replacement fan would be the best choice: Slipstream 800 rpm (sleeve bearing) or S-Flex 1,200 rpm (FDB)?
Thank you in advance for your answers.
Where do you find such anecdotal info regarding the fans? I can only speak from my own experience: Of the 2 MOdu82+ PSUs I've used, a 625W and a 425W, both have had exactly the same quiet idle performance. I have not examined the fan in the 425W, but I'm quite sure it's the same model. Even if they weren't, there's no logical reason for the fan in the 425W to be somehow "worse" than the one in the 625W.
The 625W model has been working nearly 24/7 for about 4 months in my main system. No change whatsoever in acoustics... which is exactly what I'd expect because the PSU fan hardly ever ramps up from its idle speed -- at such low rpm, the wear on the bearing is so low that it should last for years. This PC is at the threshold of my hearing / ambient until I get to less than 2' from it. I believe it would measure 15dba or better in the anechoic chamber.
There's no way I'd do a fan swap here. The fan + controller symbiosis is just too good to mess with. As soon as you stick any other type of fan, you lose that tight integration between the PSU, fan and controller -- I could not tell you how to use a 2- or 3- wire fan with the controller.
Now down the road if my fan got noisy, I'd ask Enermax for a replacement fan. Surely that would be covered under warranty.