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Asus Prime X370 Pro, fans sometimes start on boot, othertimes not.

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Posted · Original PosterOP

Hi, here's the fan setup:


CPU header - Noctua CPU cooler fan 1

CPU OPT - Noctua CPU cooler fan 2  


Both start up no problems every time.


Chassis fan 1 - Case rear exhaust fan, connected directly to header, sometimes works, sometimes doesn't. When it doesn't work, it sits there twitching every few seconds as the voltage is obviously trying to turn the fan but can't overcome the lack of momentum.  


Chassis fan 2 - Splitter for the Case intake (120mm) and the top exhaust (140mm) the Corsair intake starts every time, but the Fractal Design 140mm on top shares the same issue as above, sporadically starts and twitches.  


Qfan tuning was set up, but the fans are set to start at 60% and them ramp up as heat is applied.  


Could a solution be to start the fans at 80% speed at 30c, then drop to 60% speed at 35c and above, that way the computer will start and immediately trigger a fast spin, then pull it back once the temperature changes. Sound like a plan?

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1 hour ago, RockandGrohl said:

Could a solution be to start the fans at 80% speed at 30c, then drop to 60% speed at 35c and above

I really don't think so.

Set a curve in Bios

CPU:i7 9700k 4.9Ghz All Cores Mobo: MSI MPG Z390 Gaming Edge AC, RAM:Corsair Vengeance LPX 16GB 3200MHz DDR4 OC 2500Mhz GPU:MSI RTX 2070 ARMOR 8GB OC Storage:Samsung SSD 970 EVO NVMe M.2 250GB, 2x SSD ADATA PRO SP900 256GB, SSD mushkin chronos 120GB, HDD WD CB 2TB, HDD GREEN 2TB PSU:Corsair CS 650 M Gold Display(s): 1st: LG 27UK600-W, 4K, IPS, HDR10, 10bit(8bit + A-FRC). 2nd: Samsung P2470HD Cooling:Fazn CPU Cooler Aero 120T Push/pull Keyboard: Corsair K95 Platinum RGB mx Rapidfire Mouse:Razer Naga Mouse 2014 Headset: Razer Kraken 7.1 Chroma Sound: Logitech X-540 5.1 Surround Sound Speaker Case: Modded Case Inverted, 5 intake 120mm, one exhaust 120mm.

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I think the starting voltage is to slow for the fans, that won't start. But you are right at the border. If it is a little warmer you get more voltage and it starts :)


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