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  1. #1
    New ROGer Array Jesseinsf PC Specs
    Jesseinsf PC Specs
    MotherboardASUS ROG Maximus XI Extreme (Z390)
    ProcessorIntel Core i9 9900K
    Memory (part number)Corsair CMW128GX4M4E3200C16
    Graphics Card #1NVIDIA - GeForce RTX 2080 Ti FE
    Sound CardCreative Labs Sound Blaster AE-9
    MonitorSamsung 32" UH750 QLED UHD Monitor
    Storage #1Samsung 970 Pro M.2 PCIe SSD 1TB
    CPU CoolerCooler Master MLX-D36M-A20PC-R1 w/ Noctua NF-F12 industrialPPC-2000 IP67 PWM x3 Fans
    CaseLian Li PC-011 Dynamic XL (ROG Certified)
    Power SupplyCooler Master V1200 Platinum
    Keyboard RAZER HUNTSMAN ELITE - LINEAR OPTICAL SWITCH (Red) w/ PBT Keycaps
    Mouse Razer Basilisk Ultimate with Charging Dock
    Headset Bowers and Wilkins P9 Signature
    Mouse Pad Razer Vespula V2 Mousepad
    Headset/Speakers Creative GigaWorks T40 Series II
    OS Windows 10 Pro for Workstations
    Network RouterROG Rapture GT-AC5300
    Accessory #1 Microsoft Xbox Elite Wireless Controller Series 2
    Accessory #2 Logitech BRIO ULTRA HD PRO WEBCAM
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    CPU_OPT header Motherboard Detection

    Today I just added a fan to the CPU_OPT header. When I checked the monitoring section of the BIOS it doesn't detect the fan and says "NA", but the fan is on and working. Same goes for AI Suite 3. However if I change the fan speed of just the CPU Fan then it also controls CPU_OPT. Is this normal or is there a malfunction? If this is an issue, then would anyone know a solution? I just like things to work as advertised.

  2. #2
    ROG Guru: Yellow Belt Array pndiode PC Specs
    pndiode PC Specs
    Laptop (Model)ASUS G752VL-DH71
    MotherboardROG Maximus IX Extreme
    ProcessorI7-7700K
    Memory (part number)G-Skill F4-3600C19Q-32GTZRB
    Graphics Card #1ROG GTX 980 MATRIX-GTX980-P-4GD5 Bykski Water N-AS98ROG-X Full Cover
    Graphics Card #2ROG GTX 980 MATRIX-GTX980-P-4GD5 Bykski Water N-AS98ROG-X Full Cover
    MonitorSAMSUNG S22D300HY (2 ea)
    Storage #1WD Black SN750 1TB
    Storage #2WD Blue 4TB (4 ea)
    CPU CoolerEK PE 360 (Top), PE 240 (Front), and Xres 100 Elite
    CaseROG Strix Helios
    Power SupplyThermalTake Toughpower 1200W
    Keyboard Cerberus
    Mouse Logitech MX Master S2
    Headset ROG Strix Fusion 300
    Mouse Pad Generic
    Headset/Speakers Bose Companion 3 Series II
    OS Win 10 Pro 2004
    Network RouterGeneric
    Accessory #1 ROG Aura Terminal
    Accessory #2 ROG 10GB Express
    Accessory #3 Corsair ML140 (4 ea), Corsair ML120 (3 ea)

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    Jan 2016
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    Normal function

    CPU_OPT is slave to CPU_FAN.

  3. #3
    New ROGer Array Jesseinsf PC Specs
    Jesseinsf PC Specs
    MotherboardASUS ROG Maximus XI Extreme (Z390)
    ProcessorIntel Core i9 9900K
    Memory (part number)Corsair CMW128GX4M4E3200C16
    Graphics Card #1NVIDIA - GeForce RTX 2080 Ti FE
    Sound CardCreative Labs Sound Blaster AE-9
    MonitorSamsung 32" UH750 QLED UHD Monitor
    Storage #1Samsung 970 Pro M.2 PCIe SSD 1TB
    CPU CoolerCooler Master MLX-D36M-A20PC-R1 w/ Noctua NF-F12 industrialPPC-2000 IP67 PWM x3 Fans
    CaseLian Li PC-011 Dynamic XL (ROG Certified)
    Power SupplyCooler Master V1200 Platinum
    Keyboard RAZER HUNTSMAN ELITE - LINEAR OPTICAL SWITCH (Red) w/ PBT Keycaps
    Mouse Razer Basilisk Ultimate with Charging Dock
    Headset Bowers and Wilkins P9 Signature
    Mouse Pad Razer Vespula V2 Mousepad
    Headset/Speakers Creative GigaWorks T40 Series II
    OS Windows 10 Pro for Workstations
    Network RouterROG Rapture GT-AC5300
    Accessory #1 Microsoft Xbox Elite Wireless Controller Series 2
    Accessory #2 Logitech BRIO ULTRA HD PRO WEBCAM
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    Quote Originally Posted by pndiode View Post
    CPU_OPT is slave to CPU_FAN.
    So the entry in the BIOS for my MB should be disregarded? One would think that if the Monitoring section in the BIOS has a CPU_OPT listed that the BIOS would detect it. I only want to see the fan speed. I'm thinking that the sensor in the fan is not working. I am getting more fans next week which I will test my theory.
    Last edited by Jesseinsf; 05-22-2020 at 03:39 AM.

  4. #4
    ROG Guru: Yellow Belt Array pndiode PC Specs
    pndiode PC Specs
    Laptop (Model)ASUS G752VL-DH71
    MotherboardROG Maximus IX Extreme
    ProcessorI7-7700K
    Memory (part number)G-Skill F4-3600C19Q-32GTZRB
    Graphics Card #1ROG GTX 980 MATRIX-GTX980-P-4GD5 Bykski Water N-AS98ROG-X Full Cover
    Graphics Card #2ROG GTX 980 MATRIX-GTX980-P-4GD5 Bykski Water N-AS98ROG-X Full Cover
    MonitorSAMSUNG S22D300HY (2 ea)
    Storage #1WD Black SN750 1TB
    Storage #2WD Blue 4TB (4 ea)
    CPU CoolerEK PE 360 (Top), PE 240 (Front), and Xres 100 Elite
    CaseROG Strix Helios
    Power SupplyThermalTake Toughpower 1200W
    Keyboard Cerberus
    Mouse Logitech MX Master S2
    Headset ROG Strix Fusion 300
    Mouse Pad Generic
    Headset/Speakers Bose Companion 3 Series II
    OS Win 10 Pro 2004
    Network RouterGeneric
    Accessory #1 ROG Aura Terminal
    Accessory #2 ROG 10GB Express
    Accessory #3 Corsair ML140 (4 ea), Corsair ML120 (3 ea)

    Join Date
    Jan 2016
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    Posts
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    BIOS Entry

    Quote Originally Posted by Jesseinsf View Post
    So the entry in the BIOS for my MB should be disregarded? One would think that if the Monitoring section in the BIOS has a CPU_OPT listed that the BIOS would detect it. I only want to see the fan speed. I'm thinking that the sensor in the fan is not working. I am getting more fans next week which I will test my theory.
    Okay, now I understand, but I do not have that motherboard. No, the CPU Optional Fan speed should register in BIOS when a fan is connected to the CPU_OPT. I tried it with a 3-pin and 4-pin fan, both show speed in rpm. The only time it shows N/A is when no fan is connected (VIII Gene/Formula, IX Extreme does not have CPU_OPT).

  5. #5
    New ROGer Array Jesseinsf PC Specs
    Jesseinsf PC Specs
    MotherboardASUS ROG Maximus XI Extreme (Z390)
    ProcessorIntel Core i9 9900K
    Memory (part number)Corsair CMW128GX4M4E3200C16
    Graphics Card #1NVIDIA - GeForce RTX 2080 Ti FE
    Sound CardCreative Labs Sound Blaster AE-9
    MonitorSamsung 32" UH750 QLED UHD Monitor
    Storage #1Samsung 970 Pro M.2 PCIe SSD 1TB
    CPU CoolerCooler Master MLX-D36M-A20PC-R1 w/ Noctua NF-F12 industrialPPC-2000 IP67 PWM x3 Fans
    CaseLian Li PC-011 Dynamic XL (ROG Certified)
    Power SupplyCooler Master V1200 Platinum
    Keyboard RAZER HUNTSMAN ELITE - LINEAR OPTICAL SWITCH (Red) w/ PBT Keycaps
    Mouse Razer Basilisk Ultimate with Charging Dock
    Headset Bowers and Wilkins P9 Signature
    Mouse Pad Razer Vespula V2 Mousepad
    Headset/Speakers Creative GigaWorks T40 Series II
    OS Windows 10 Pro for Workstations
    Network RouterROG Rapture GT-AC5300
    Accessory #1 Microsoft Xbox Elite Wireless Controller Series 2
    Accessory #2 Logitech BRIO ULTRA HD PRO WEBCAM
    Jesseinsf's Avatar
    Join Date
    Mar 2019
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    Posts
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    Quote Originally Posted by pndiode View Post
    Okay, now I understand, but I do not have that motherboard. No, the CPU Optional Fan speed should register in BIOS when a fan is connected to the CPU_OPT. I tried it with a 3-pin and 4-pin fan, both show speed in rpm. The only time it shows N/A is when no fan is connected (VIII Gene/Formula, IX Extreme does not have CPU_OPT).
    I figured it out. You can't have 2 fans connected to the CPU_FAN header if you want the motherboard to detect the fan speed from the fan connected to the CPU_OPT header (One fan per CPU header). If you have an 360mm AIO then one of the fans needs to be connected to another header like a Radiator header.

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