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what about their bios fan control?
Well in past generations its been restricted in the way they set it up, in a lot of motherboards they had very high restictions for Cha_FAN headers above 40%, in recent generatiosn they have implemented a sort of FanXpert inside the bios i believe they call it Qtuning, but it needs to read correctly the fan for you to be able to lower the restrictions, in some cases it does and in others it simply cant, i tried a lot of fans and to me one of the best build pwm deisgn is noctua and had issues with it, again this is my experience with only 1 motherboard (asus h170 pro gaming), and i still have it, and have updated bios every six months and the behavior is still the same.
Now one thing that you need to take into account, is that Asus is really good with FanXpert, probably the best software fan control of all manufacturers, and even their bios preset policies are pretty good, some here just set it to silent and be fine with it, but i personally like more control on that, again thats just me.
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it doesn't seem to play nice with speedfan
I seen some asus owners have fine time on Speedfan, personally i never had a perfect experience with speedfan, some of the headers in most of the builds i tried were not supported, so i cant say much about speedfan and asus.
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how are fake 4pin pwm headers fake ?
This is a thing of the past, newer motherboards have switchable headers on the bios, but in case you want to read,
ASUS Z87-Deluxe fake 4-pin headers & other fan control info.
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why called seems to work
Asus with Ai Suite has a very wierd way of displaying CPU temperature, that its the temperature that FanXpert takes to rule the fan behavior graphs that you do or that FanXpert suggests, so for example, i can plan a fan behavior, but if the temp is not real then it wont work the way i want it. The CPU temperature displayed on AI Suite doesnt match with core temperature nor with package temperature and to make it worst the behavior is not linear, its less on lower temps and scales up much faster on higher temps. What asus have said is that this is a very high end algorithm that asus engineers have design that take into account multiple sensors (not only the cpu) to predict a more real CPU temperature.... to me its is simply worthless algorith because it doesnt give me the temperature which i rule the fans.
Now remember im telling you my experiences, there are a lot here that have good experiences with Asus, but now a days to me they are my last choice on motherboards, i do recommend them still to users that want a setup that its set it and forget it, that dont want to tweak or mess with bios, i still think FanXpert is the best software for fan control on any motherboard manufacturer.
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doesn't work for me at all. it crashes in windows 7
It should, but early version of AI Suite / FanXpert were buggy on some motherboards, but none the less i never had a asus motherboard that couldnt load the AI Suite.