Originally Posted by rems
Even Derbauer thinks the fan is not needed and that there should just be a larger heatsink.
Also x570 chipset seems to consume a lot more watts at idle compared to x470.
Physics-wise you're talking about a 15W chipset cooler (you don't design for typical
unless you're a failure of an engineer you design for maximums, there's something called safety factor) that has to fit in ~ 15mm z-height and deal with poor airflow in some flashy cases.
To maintain below 80°C (basically when the MSI fan ramps up) with board temp ~30°C then you are looking at cooling 15W with 3.3°C/W
Even with a copper heatsink, you need at least around 37mmx37mm at 800LFM airflow: http://enzotechnology.com/performance/cnb_s1l.pdf
If the z-height was ~30mm that would be achievable with far less airflow (~150LFM): http://enzotechnology.com/performance/cnb_s1.pdf
celsia thermal calculator suggests 6.0cm x 4.0cm or 5.0x5.0cm is the right size for a proper finned heatsink of 15mm height; whereas for natural convection (not feasible with massive GPUs over chipset) you're looking at about 9.0cm x 9.0cm which is nearly half the width of an ATX board.
Using aluminum? Your thermal resistance is nearly double.
This is why there's Asrock Steel Legend , Taichi, and MSI Ace using chipset coolers and M.2 coolers combined.
Chipset temperature 80°C gleaned from : https://www.tomshw.de/2019/06/12/lau...slab-exklusiv/
Also Aorus Xtreme if you are looking at $700 boards
edit: throttle point is 95°C on ASUS and 105°C on Asrock per