대충 25khz?
[링크 : https://blog.naver.com/divenire_am/220489050085]
ATX 규격은 아니고 intel 팬에 대한 규격으로 있다고 ai 님께서 이야기 하신다.
| 4-Wire Pulse Width Modulation (PWM) Controlled Fans 2.3.1 PWM Output Signal The Hardware Monitor Devise is required to provide an open-drain or open-collector type output for the PWM signal on pin 4 (see Table 1 and Figure 8) with the following properties: Frequency: 25kHz nominal, 21-28kHz is acceptable Current sink capability: 5mA required, 8mA recommended Maximum voltage capability: 5.25V Maximum VOL: 0.8V Signal is not inverted, 100% PWM results in Max fan speed |
[링크 : https://glkinst.com/cables/cable_pics/4_Wire_PWM_Spec.pdf]
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