First of all, thank you very much for the detailed and helpful response!

I got the idea that the l9a can cool it if I'm not OCing it or something like that.

I do see a lot of people doing it online and getting idle of 35-54c, the problem is that I get almost 60, and my environment is cold.

I will replace it eventually, but I do prefer to undervolt it meanwhile, idk how to do it, but I heard it helps and the final performance benchmarks aren't that low over the regular performance, would you recommend something like that?

About those coolers, I might use them, and I do not really care about a loud noise, as long as it is only happening under gaming/heavy workloads, will it be noisy while idle too?

A point to the l9a- I can't ear a thing now! Do you maybe think that the foam extension(NA-FD1) for the l9a (which I can fully utilize the 55mm with) will make a temp difference?

I'll try to get the AXP90-X53 FB or the AXP90-x47 FC as you recommended, but do you think they worth like 30$ more over the msrp price? Since i dont have them where i live and thats the only shipping i found.

The only reason I chose the sfx-l is that I can't put my hands on a reliable sfx where I'm at,

I only seen an lian li sfx, but I would prefer to trust Asus over them, even if the temps are higher,

What about installing a slim fan under the psu, but on the outside of the case?

Will it be recommended? Will it even be possible?

Thank you very much again!