Asus M5A99FX Post fans at low speed, starts to over heat, then Shuts Down. Reboots fine though!

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nocash000

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Jul 11, 2014
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New Asus M5A99FX with an FX8350, Corsair H50 with Push Pull. Nothing overclocked. At boot / post time the fans power on at low rpm. After about 15 seconds the system shuts down. If I power it back up it then fires the fans up proper, and boots ok. Watching the monitor in bios on clean boot, I see when this occurs the CPU temp starts climbing and when it hits 56-57c it shuts off. My suspicion is the low rpm on post is allowing the overheat. But is there a setting I have wrong thats causing this? All cool n quite,, c6, epu, is disabled. Are the fans normal to start at low RPM, they eventually kick in.
 
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nocash000

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Jul 11, 2014
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Reset plenty of times



Well yeah it seems like the fans are lagging to raise rpms. All are connected to the motherboard already. The h50 has no special connections just two fans mounted and connected to motherboard. Once it gets going proper I idle 37c so its capable.
 
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nocash000

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Jul 11, 2014
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What I noticed this morning while watching bios, as the temp rises, the CPU_OPT rpm is 0. I have the H50 pump connected to this. Why does a reboot kick start it I dont know. So I've moved it to CPU_CHA2 fan. Will test more today.

Pump has always shown around 990rpm. Even on previous motherboard. Is that normal? Should it be higher?

Suspect either the pump is going bad or i have a bad CPU_OPT fan connector on the mobo.

UPDATE:
Connected to alternate fan connector it still happens. Suspect the fan connectors have a delayed start. Connected to a molex 3 pin adapter, direct to psu. STILL does it. Suspect H50 pump has delay start. I just moved the H50 from an old rig and never had this issue. Perhaps it just didnt affect the Phenom 955 as much as this fx8350 .
 
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ingtar33

ingtar33

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Dec 17, 2012
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the h50 is borderline capable to cool a fx8 core. I certainly wouldn't overclock much on it. Those pumps should be spinning at 1400rpm... if it's not hitting 1400, then there is an issue. since the bios is reporting 900 then the pump is malfunctioning.
 
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nocash000

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Jul 11, 2014
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I'm using the auto/turbo OC for the cpu and have an OC on the memory for 2133mhz. Gaming in Watch Dogs for example I peak 47c. So it's holding temps pretty good. But if its borderline failure not so good. Funny its been 900rpm since purchased 5 years ago. Wonder if it's always been bad. Thanks for the consultation.

Note for anyone with this problem. There is an obvious fan delay at post I cannot figure out so to ensure the fans are spun up before post I hit power, then press and hold the reset button for a few seconds. This seems to allow time for things to spin up and post.
 
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