Do you have dust filter(s) in front of your intake fan(s), and is there positive air pressure inside the case that would deter dust from entering through unfiltered gaps in the case? (To maintain positive pressure, the intake fan(s) should be set to spin fast enough that air is pulled in faster than the exhaust fan(s) try to push air out.)The main reason I set 0rpm fan off below 37c is to reduce the speed dust builds up in the fan/heatsink.
I assume you also mean you have no intake fans. Given a choice between an intake fan and an exhaust fan, I would choose to have an intake fan, because that would establish positive pressure inside the case and provides a single point to filter to keep out dust. The negative pressure that an exhaust fan establishes pulls dust into the case unless you filter the many openings of the case; it's much easier to filter intake fans (assuming positive pressure) than to filter the many openings (without positive pressure).No I only have a single exhaust fan.
Why do you believe that's generally true? The BIOS on my MSI X470 Gaming Plus allows me to choose from four temperature sources for each fan header, and one of the four is the cpu temperature. The FanControl software I mentioned gives even more choices for each fan header.A chassis fan header generally uses the temperature sensor on the mobo, and has NO knowledge of the internal CPU chip temperature.
Sounds unusual but I won't argue with success. It might be more accurate, though, to say you're happy with the thermal performance of the little that remains of your case.I'm pretty happy with the thermal performance of my case I have all the side panels and front panels removed with a towel placed over the top of it to stop dust falling in.
Reasonably quiet PWM fans have gotten pretty cheap, if you ever decide to replace the molex fan. Or perhaps you could construct a fanheader-to-molex adapter cable, and set the fanheader to DC mode at less than 100%. To reduce the negative pressure or establish some positive pressure.I do have a front case fan but it plugs into a molex connector and runs 1500rpm nonstop so I had to unplug it.