Unverified85% confidenceDecision RuleTime unknown
3pin(DC)接口风扇只能通过调压变速、无法低速稳定运行，且不能PWM精确调速；追求智能温控和低负载静音应选4pin(PWM)接口风扇
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85%
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Long-term
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Unverified更换CPU风扇/散热模组时，必须匹配主板的风扇接口针脚数：4-pin(PWM)可智能调速降噪，3-pin(DC)只能通过电压粗调，2-pin无法调速。将4-pin PWM风扇插到3-pin接口会导致风扇长期全速运转产生高噪音80% similarUnverified显卡风扇的接口引脚需与原厂一致，主流为2pin/4pin，部分卡采用双联体共用接口。更换前需拆机确认接口形状和引脚数，4pin支持PWM智能调速，2pin只能靠电压调速79% similarUnverified选装原厂替换风扇时必须确认叶片直径、孔距、接口针数（2pin/4pin PWM）与原风扇一致，同尺寸不同接口会导致无法调速或无法启动71% similarUnverified舵机控制依赖PWM（脉冲宽度调制）协议，通过改变方波高电平时间占周期的比例来控制转角66% similarUnverified单纯更换显卡风扇时优先选择与原扇框架尺寸一致的替换扇，主流显卡风扇为75mm/85mm/90mm/95mm直径，接口以4Pin PWM为主，部分双风扇共用接口需注意针脚定义（不同品牌信号线序不通用）65% similar
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