Jonsbo UMX3 optimized for low noise

OK, inspired by some of the recent "low noise" posts, I wanted to share my current living room setup and the story behind it.

I got the Jonsbo UMX3 some years ago, mainly because it was simply the nicest looking case I had ever seen (for my tastes) and it was available with a solid side panel (a must for me). Since I game very little these days and my son got really into it, the machine moved into the living room eventually. We also use it as a HTPC and I sometimes use it for work via remote desktop.

Over the years, I put more powerful hardware in it (a Zotac 3070 in particular) and it started to get louder than I liked - ideally, I want my computers to make little to no noise. Our appartment is pretty silent, so even a low humm is audible. I had been looking at this sub and many other channels to find a bigger/better ventilated case that would fit into the ~40cm depth space in the living room (see photo), had a solid side panel, and would look at least not much worse than the UMX3. But I simply haven't found anything that comes close, so last year I wanted to see how silent I could get the machine while still keeping most/all of the performance. Here are the things I did:

I had already curve undervolted the 3070 the day I got it (runs at 1800Mhz/875mV at load), so to get noise further down, I decided to deshroud it and use the two Arctic 120mm that used to be bottom intakes as fans. That was very easy to do (zip ties FTW) and the result was spectacular. The GPU used to be the loudest part of the machine, now you can barely hear it.

I used Kombo Strike (a MSI BIOS feature, this is a Mortar B450M Max) to undervolt the 5800x3D by 30mV, which reduced power consumption by roughly 10-15W at full load, with the added effect that it clocks slightly higher in intermittent loads.

Most importantly, I spent some quality time on fan curve optimisation, using Argus Monitor. Since I am not very concerned about temps in general, I started with a target of 85C at full CPU+GPU load, knowing that the machine is almost never in this situation. Leaving a little bit of a buffer for hotter days, I was able to get the fans to stay below 1000rpm (see screenshot with temps+rpm at full load) with the exception of the back fan, which has a very nice noise profile after removing the grill. The biggest noise source is the 140mm top fan now, because the grill (which I don't want to remove) creates turbulence. The GPU fans could go lower even, but that doesn't help with noise and raises the CPU temp a little.

During gaming, all fans remain below 600-700rpm now and the machine is not very audible. Ideally, I would love everything to stay below 400rpm, but this is not possible without reducing performance in this case. During idle, movies, office, etc., I cannot hear the computer at all.

Overall, I am very happy with the outcome, since I still love how the case looks.

name of the giant tower pls. Tks man.