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  1. #1
    ROG Guru: Orange Belt Array XYchromosone PC Specs
    XYchromosone PC Specs
    MotherboardASUS Maximux XI Extreme [BIOS 1602]
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    XYchromosone's Avatar
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    What type of thermistor is used as a temp sensor on Maximus X MoBos?

    Hi ROG aficionados, I am trying to get information on the type of thermistor that is used on the Maximux X mobo to monitor temperature? is it a NTC or PTC type? and what value should it be?

    For those who have no idea of what I am talking about, some of the headers on the ROG boards [and possibly other mobos], are designed to plug in a special passive electronic device known as a thermistor, which is a resistor that changes resistance depending on heat. There are 2 classes of thermistors, Negative Temperature Coefficient [NTC], which means that as the resister warms up its resistance decreases in value. On the other hand, Positive Temperature Coefficient [PTC], which does the opposite, its resistance increases as the thermistor heats up. The correct type of thermistor is attached to an external device that you want to monitor its temperature e.g., you might like to monitor the temp of an SSD drive.

  2. #2
    ROG Guru: Yellow Belt Array
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    I bought a TC 10k probe on aliexpress for my x99 strix and it works perfect so i assume it would be the same on your mobo.
    Don't know if it is positive or negative but it is labelled as an universal type air conditionner temperature sensor.
    Last edited by namoi; 03-26-2018 at 09:23 AM.

  3. #3
    ROG Guru: Black Belt Array Korth PC Specs
    Korth PC Specs
    MotherboardASUS X99 R5E (BIOS2101/1902)
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    Not sure what brand of thermistor ASUS provides with the motherboard.

    But these are all fully compatible:

    https://www.amazon.com/XSPC-XS-10KSEN-Wire-Sensor-10K/dp/B00CMR38LC/ref=sr_1_1?ie=UTF8&qid=1434292452&sr=8-1&keywords=10k+temperature+sensor+pc

    http://www.xs-pc.com/temperature-sen...lat-sensor-10k

    https://www.newegg.com/Product/Produ...0148-_-Product

    https://www.adafruit.com/product/372
    - needs https://www.moddiy.com/products/Dupo...iABEgJIz_D_BwE
    "All opinions are not equal. Some are a very great deal more robust, sophisticated and well supported in logic and argument than others." - Douglas Adams

    [/Korth]

  4. #4
    ROG Guru: Orange Belt Array XYchromosone PC Specs
    XYchromosone PC Specs
    MotherboardASUS Maximux XI Extreme [BIOS 1602]
    Processori9 9900KS
    Memory (part number)G.Skill Trident Z RGB CL17 3600MHz 32GB [4x8]
    Graphics Card #1ASUS ROG Strix Gaming GTX 1080Ti 11GB
    MonitorAOC AGON AG271QG 27" 144Hz [165Hz OC]
    Storage #12 X Samsung 970 Pro NVMe 1TB M.2 SSD [DIMM.2_1+ DIMM.2_2]
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    thanks both of you kind folks for the information. Knowing the thermistor is a 10Kohm helps heaps. I can now experiment and see what works best. I'm a retired technician fixing TV's VCR's DVD's etc. and have lots of spare parts. I have both brand new NTC and PTC thermistors of various values so I'm confident to come up with something that works. Sure, I could simply buy one from one of those online stores you kindly linked, Korth, but where's the fun in that? LOL.

    BTW i'll post my finding once I evaluate what type of thermistor works on these mobos… they should all use the same type I'd say.

    Meanwhile, if anyone reading this has purchased a temperature sensor and has some basic knowhow on how to use a multimeter, one could simply read the resistance of the sensor by probing the two wired plug that plugs into the external temperature sensor header on the mobo [while it is not connected to the mobo, of course], and read the resister value at room temperature or about 20C. Then hold the thermistor end in one hand to warm it up and take another reading. If it reads a high value when it has warmed up then it's a PTC thermistor, if it's a lower value then it's a NTC... any tech-head takers out there ?


    update: I checked the online store [https://www.adafruit.com/product/372] and it clearly states 10K "NTC". QUESTION answered and problem solved. Thanks again Korth for the links and Namoi too
    Last edited by XYchromosone; 03-28-2018 at 01:09 AM. Reason: added info regarding NTC type thermistor

  5. #5
    ROG Guru: Black Belt Array Korth PC Specs
    Korth PC Specs
    MotherboardASUS X99 R5E (BIOS2101/1902)
    ProcessorHaswell-EP E5-1680-3 SR20H/R2 (4.4GHz)
    Memory (part number)Vengeance LPX 4x8GB SS DDR4-3000 (CMK32GX4M4C3000C15)
    Graphics Card #1NVIDIA Quadro GP100GL/16GB, 16xPCIe3, NVLink1 (SLI-HB)
    Graphics Card #2NVIDIA Quadro GP100GL/16GB, 16xPCIe3, NVLink1 (SLI-HB)
    Sound CardJDS Labs O2+ODAC (RevB), USB2 UAC1
    MonitorASUS PG278Q
    Storage #1Samsung 850 PRO 512GB SSDs, 4xSATA3 RAID0
    Storage #2Comay BladeDrive E28 3200GB SSD, 8xPCIe2
    CPU CoolerRaijintek NEMESIS/TISIS, AS5, 2xNH-A14
    CaseObsidian 750D (original), 6xNH-A14
    Power SupplyZalman/FSP ZM1250 Platinum
    Headset Pilot P51 PTT *modded*
    OS Arch, Gentoo, Win7x64, Win10x64
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    The firmware on motherboards seems to run some sort of self-calibrating code which compensates for different wire/lead lengths and other variances (within realistic limits, anyhow).

    It seems to primarily be concerned with delta temps, not with absolute temps. Thermal monitoring/watchdog components (like these) are already integrated into critical parts (like main processor and controller/chipset and embedded VRM PWM/ASIC) which seem to be in charge of actual per-component thermal throttling/shutdown on the hardware.

    And it seems to have an actual error margin of roughly ±0.5~1.0°C (±1~2°F), regardless of how precise the resolution/reporting might appear/claim to be. This inaccuracy isn't really meaningful in this application, but it's easily confirmed with a precision DMM.
    Last edited by Korth; 03-28-2018 at 03:37 AM.
    "All opinions are not equal. Some are a very great deal more robust, sophisticated and well supported in logic and argument than others." - Douglas Adams

    [/Korth]

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