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It's interesting that the winbond chip can be programmed for either thermister or diode sensing, some Asus boards use thermistors and you would think that logically the mobo manufacturer would stick with one method for compatibility with other products, but i suppose that would be too much to hope for.
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They probably have. The flexibility of the Winbond is because the CPU's use the diode method. A diode is actually embedded in the CPU core of some CPU's. I think for those that aren't, a diode can be located nearby. Anyway by having it able to handle both types of sensors, it makes the chip attractive to mobo builders.
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In the absence of a response from Asus I think theres a fairly simple way to check how the chip is programmed, a b3435 thermister should have a resistance of 4.16kohms at 50 c so if I put that resistance across the 2 pin connector the bios should report PSU at 50 c, and likewise at 10k should report 25 c.
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You sound like you're more "up" on this than I am, it's been just over 20 years since I did any work with thermistors. I'm not sure about the 10K, as there is supposed to be another 10K resistor in series with this onboard, but you're probably right.
Good luck, and let us know if you get that part and where...
-clintfan