I was looking into Fuma 2 to cool my 5800X but a lot of owners are saying it’s thermal throttling and/or hitting 90C. Granted, the 5800X is the hottest CPU of Zen 3, but thermal throttling is a hard pass.
It depends on a few things like:
- how good the airflow in the case is?
- if it's stock or with PBO, and if with PBO is it auto or manual tuned PBO?
- room temp
I'm using my Fuma 2 with the 5600X stock and without the extra fan installed and without the front case fans ON and with the Fuma2 set at max 90% speed, I get to 67 degrees in CB 20 MT (at that temp is at about 85% speed). It's also very quiet.
Even with 5800X (which means also 5800X3D) being the hottest, if I turn ON the case fans and crank everything at 100% and use the 3rd CPU fan, there is no way it will get to 90 degrees in my case.
It also depends on the silicon of the chip, my 5600X is a silver sample, so it's almost useless to use PBO, but with a golden sample it's a complete different story.
The TLDR version is: depending on what the reviews show, if a Noctua NH-D15 can cool the 5800X3D well, then so will the Scythe Fuma2, with maybe 2-3 degrees hotter, at worst.
There is a reason why GN gave the Scythe Fuma 2 "best overall cooler" in 2021 award, it does the job of $100+ coolers, at just $60: