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Not sure tbh - it’s had new fans in the past and the old powersupply (which recently shit itself) was quieter but the case rattles and has no damping or airflow design. I’ll take a video/pictures this evening to demonstrate.
The case is the only remaining part of a gaming PC I got in about 2001/2 and has dodgy grounding and a big Perspex window.
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I mean, case transplants can be a pain in the arse but its not as if we don't have the time for tasks like this now days!
Its all down to how much money you want to spend tbh. Decent quiet fans are not cheap. If you need a new CPU cooler and a couple of case fans, that can be £70 to £100. A new case, a quiet one, will be more than that.
I'm not the most experienced in building PCs but I would have thought that it's better to eliminate the noise in the first place rather than try to supress it by wrapping it in a new case. Ideally, you'd want to do both.
What's causing most of your noise...fans? Easier to replace the fans than change the case.