That PSU is probably a cheap generic, struggling to keep itself cool. Likely good for half its label, it is a firecracker with an uncertain fuse.
I would suggest a search for "ISO-450PP." Many of the sites are Russian, and I cannot reach them at work, but Hardware Insights apparently blew one up during testing.
I did a search, plenty of results like "for sale on eBay", but no sign of manufacturer website or support. In fact I have been using it over several years but just got round to trying to do something about the noise! I am not reporting a fault, it's always been like this. I assume it can't be controlled from the BIOS. I think it came with the case, which may be a Foxconn.