![]() ![]() The lower the PWM percentage, the less predictable a specific fan's actual performance will be. ![]() Do not expect a fan with 2000 RPM at 100% to run at 1000 RPM when set to 50%. Just keep in mind that 100% is full speed, and 50% is less - but 50% does not mean 50% of the RPM. The exact methodology is outside the scope of this thread. PWM can be used to control fan speed, but it does not control RPM directly. If you want your CPU fan to be responsive to CPU temp, then it should be connected to one of the Fans1-4 but it doesn't matter which one (except for specific motherboards that designate Fan1.)Ģ. Fans1-4 are controlled as one group, although all fans report their RPM individually. The other PWM zone monitors CPU temp, and that zone controls Fan1-4. There are two PWM zones on most SuperMicro boards: One PWM zone monitors system temp, and that zone controls FanA. For most NAS applications the stock CPU cooler will be OK when plugged into any of the fan headers, but if you build a system that is going to run your CPU at full load then you need to make certain your fan is running from a fan header that monitors the CPU.ġ. When you use quiet fans with a server motherboard, you need to think about your cooling. Server class fans are designed to move air. ![]() MANY OF YOU ARE THINKING LIKE DESKTOP SYSTEM BUILDERS, NOT LIKE ENTERPRISE SERVER BUILDERS.ĭesktop fans are designed to be quiet. That does not mean that FanA is the best choice for your CPU fan. What I understood from what Supermicro said is that STANDARD adjusts all fans depending on the summary of system temps where as with OPTIMAL, FANA is not affected by an increase in say CPU temps so can continue idling away saving a few $$$/£££ and Fan A are for System/CPU Fan headers - correct. Minimum speed is not affected by fan speed setting. What happens is that with a cool PC, (i.e one not under heavy load etc), regardless of Optimum or Standard, all my fans (I tied Acrtic F9/F12, Noctua F12 and Coolermaster Jetflo) run at their minimum speed and ramp up according to system temperature. They don't though, not on my x9srl anyway. Like you said, I expected under optimum the fans to run at a around 35% of max rpm under PWM control, and 50% when setting standard. "The Optimum setting runs at 30% PWM, the Standard setting runs at 50% PWM, and the Full speed setting runs the fans at max speed." I think this statement is wrong though and Ive read it in a few other places too. The only thing that doesn't tally with what I'm seeing here and part of the reason for my confusion is what I expected to happen when selecting Optimum or Standard. Putting the CPU on FanA will work as long as the fan is spinning fast enough to keep the CPU at a reasonable temp, but FanA is not monitoring your CPU temperature.Ībsolutely agree with everything you said re dual zones etc. Just look at your motherboard - often, the FanA header is in an inconvenient location but it is always near the PCIe slots. I'm not certain how PWM values relate to specific fan rpm as various fans appear to act differently. The Optimum setting runs at 30% PWM, the Standard setting runs at 50% PWM, and the Full speed setting runs the fans at max speed. The CPU fan should be plugged into one of the fan headers 1-4 (on some specific motherboards, they recommend Fan1.) FanA is for an add-on card, although it can also be used for a case fan. Fans 1-4 are all controlled together - they are not individually controlled. Think of it as two PWM "zones": one for Fans 1-4 and one for FanA. According to the manuals on many of the single CPU motherboards (no, I did not check them all) and confirmed by posts in the Supermicro FAQ, Fans 1-4 are controlled by CPU temperature, and Fan A is controlled by system temperature. ![]()
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