CPU_FAN and CPU_OPT share the same PWM fan control signal. That is intended for double fan coolers (think NH-D15 or Dark Rock Pro). Can be used for case fans, but modern CPUs can have large temperature reactions to load shifts - that makes fans ramp up and down all the time.

Feb 10, 2022 · You shouldn't be recommending first time builder to plug in the pump into CPU Fan header. In the absence of dedicated PUMP header which runs at 100%, one should use CPU_OPT and adjust fan curve to constant speed. AIO fans go into CPU_FAN, which is already tied to CPU temp sensor by default and set to some fan curve.

The manual says plug the AIO Radiator fans to the CPU_FAN and Pumps to CPU_OPT(which my mobo doesn't have) In my case, I have the Pump connected to SYS_FAN 1. By design, my LS520 AIO by deepcool runs at 100% all the time, and I checked bios/hw …

Apr 4, 2023 · The CPU opt. is just an extra connector for CPU fans in case you need more than one, for CPU coolers with multiple independent fans for example. Usually it doesn't really matter if you use one or the other, although personally I would connect the main CPU connector first before using the optional, because some applications mainly monitor the ...

Sep 23, 2021 · I've been seeing differing sources out there. Many people just plug the pump into CPU_OPT (and the fan(s) into CPU_FAN), and this certainly seems to be the easiest way. However, I've seen other resources that say you should use a header specific for pumps. For instance, my motherboard has CPU_FAN, SYS_FAN1, ..., SYS_FAN5_PUMP and SYS_FAN6_PUMP.

Jul 16, 2021 · As the title says I want to plug in a fan into CPU_OPT or I might plug a Fan Hub will it work differently or the same as SYS_FAN or CHA_FAN if its needed my motherboard is a Asus B550-F Gaming Wifi and all fans will be Be Quiet Silent Wings 3

Jun 22, 2023 · I recently bought the Asus TUF Gaming B550M-Plus WIFI II motherboard, and I'm a little confused about how some fan headers work on the motherboard. The manual gives me a table where CPU_FAN and CPU_OPT have "A" in the column for Shared Control. But I couldn't find what "A" meant. Does anyone know if I can control CPU_FAN independently of CPU_OPT?

Apr 22, 2021 · A temporary solution was to plug the PWM cable of the fans on my AIO directly in CPU_FAN, while the Unifan controller is plugged in CPU_OPT. No more message error, but the fans connected to there controller (CPU_OPT) are …

Dec 8, 2021 · I’m building my PC and all I have left is plugging in the Noctua NH-D15. I have a 140mm as the middle fan and a 120mm as the front fan. Should I plug both fans into CPU_FAN via the provided Noctua splitter or one in CPU_FAN and one in CPU_OPT on the motherboard?

Jul 3, 2022 · Normally, you'll have your AIO plugged into the spot that you have it and the fans that go to it to CPU FAN. CPU OPT is if you need additional plugs for CPU fans. You could always just open up your case and see if you have anything plugged into this header. If it's empty, then there's your answer.