CPU_OPT doesn't come on resuming from sleep

[b33zy77]

The CPU_FAN has a water pump plugged in
CPU_OPT and all sys fans have JetFlo 120ms plugged in.

When resuming from sleep in Windows 8.1, most times, CPU_OPT will not spin up, forcing a reboot.

Anyone else have this problem or have seen it?

Board is a z97x-gaming 3.

 

[cin19]

Do you use the cpu-opt header for the case fan?, If you did, and don't use it and use other header, or use the Y splitter http://images17.newegg.com/is/image/newegg/12-162-026-TS? in other header if you have more fans, because the PC thinks something wrong with that fan header, the temp is not right.

 

[b33zy77]

The odd thing is, sometimes it does come back on when resuming from sleep.

CPU_OPT is for my water pump radiator, so to me it makes sense. In fact, the motherboard specifically states this is what it is for, a water cooled CPU solution: CPU_FAN for the water pump, CPU_OPT for the radiator fan.

I'm wondering if I should get a regular 3-pin fan on the CPU_OPT instead of the 4pin fan?

I saw a post on the Intel forums (https://communities.intel.com/thread/43221?start=15&tstart=0) where Intel specifically stated this was a bug in their boards BIOS. And they issued a fix. I wonder if this Gigabyte board has a bug in the latest BIOS (F5) I'm using?

 

[cin19]

CPU_OPT for the radiator fan

That is right.

I wonder if this Gigabyte board has a bug in the latest BIOS (F5) I'm using?

Sorry , I don't know.

You maybe try set the fan speed setting for the cpu-opt in the BIOS, like maunual. Or try use the sys-fan header.