https://www.gamersnexus.net/hwreviews/3384-cooler-master-sl-600m-review-thermals-build-quality-noise
That's a good consumer case showing the chimey cooling setup.
It has a few good points in that first chipset (gpu in this case) gets very cool air and performs great but then you're exhausting warm air over the rest of the units. While this hurts CPU performance in a split chip design of a PC the mobo VRM's actually rather have some air going over them vs nothing so there are additional benefits. Airflow is pretty OP for VRM cooling in generally.
I'm interested in a tear down to see how they suck in the air and minimize the dust. 7nm+ should run even cooler esp given Ryzen 3000 is pretty easy on thermals and power draw and this will be clocked lower. RDNA2 is unknown and the 5700XT chips actually do run pretty hot. How they intake fresh air will be what I'm most interested in.
Hopefully it's done similarly to how Silverstone has done their vertical air cooling which is significantly better than the Cooler Master that you linked.
Positive pressure provided by intake fans in the bottom with magnetically attached dust filters to keep out most of the dust while simultaneously making it easy to clean the filters.
And in the bottom, the PSU exhausts air out of it's own exhaust in the shell, so it doesn't contribute hot air to the internals of the case.
I absolutely love my Silverstone RV03 (
https://www.silverstonetek.com/raven/products/index.php?model=RV03&area=en&top=C ) and because of this design, dust is an almost non-existent problem and when not under a large load it can be passively cooled as there is always airflow going from bottom to top due to the hot air escaping out the top and drawing in cooler air from the bottom. The only downside of the RV03 is the hideous front façade. /shudder.
As well since the "rear" of the MB is at the top, all the components basically get their own relatively cool stream of air unlike the Cooler Master that you linked to.
If the fan is in the top like DF speculated, then it'll be almost impossible to keep out dust as the negative pressure will pull in dust from everywhere (like the optical drive, for example).
But considering this is a consumer device meant for a consumer price point, it's unlikely there will be a dust filter. Still, as long as the fan is located at the bottom (assuming that's where the intake vents are) then it'll be easy enough to attach your own dust filter to prevent much dust from getting in.
Regards,
SB