Seasonic M12 II Evo 850w - fan question, correct or replace

[lollox]

So, very niche question first. Bought the above psu ages ago hoping near silence until gaming like this review suggests

https://www.kitguru.net/components/power-supplies/zardon/seasonic-m12-ii-bronze-evo-edition-850w-psu-review/6/

but instead I think my fan is constantly spinning even at low loads, like this review

https://www.eteknix.com/seasonic-m12ii-bronze-evo-edition-850w-power-supply-review/7/

Question that i almost certainly know the answer to: is there a way of engaging the fan curve that was promised on the box?

Assuming all of the above comes to nothing, spec me a replacement.
Modular, ideally with around 3 inches of unsheathed mobo connector (installing into pure base 500 so not much cable on display)
Very Quiet - some noise when gaming is fine, the rest of my fans are all currently below 500 rpm on low load


Currently rig: b450, 3600, 1660ti, aio, few case fans and drives. Would not rule out a more power hungry gfx card in the future but nothing planned.

thanks in advance

also hope the links are ok

 

[lollox]

solid recomendations both reading reviews thanks, anything to chose between them for the difference of a few quid? anything even quieter for up to 30 more (at the top end)?

thanks