Hi.
I've got a very odd and frustrating problem and before I RMA my board I'm keen to see whether there's even the slightest chance it could be my CPU at fault. I can't let my family use this living room pc and I can't start using it without checking temps are ok.
The board is a Gigabyte Z97n Wi-Fi.
Randomly, probably between every 5 and 10 shutdowns (not restarts or sleep resumes) on average, my CPU starts creeping towards 100c in bios and about 60c in idle in Windows at 800mhz. If you try and do anything demanding, the CPU starts throttling almost instantly. The temps are real, I can feel from the coolers I've tried (H60 and stock intel).
I have narrowed it down to the board or CPU and I can't test either myself. I've tried different ram, psu, heatsinks, with IGP, with discrete GPU and it happens without a hard drive or any unecessary connections at all such as USB or audio and mounted on a cardboard box.
I've also run at stock, overclocked, all BIOS versions, optimised defaults, new battery and flashed main BIOS with backup. It's definitely the board or CPU and I have checked and there is 100% no damage to either from cooler installation (I have photographed both and studied in detail).
If the problem doesn't occur at boot, it never appears during that session. Fortunately this means the pc is usable once I'm sure all is well.
Just to throw a spanner in the works, I've found out by pushing the power button in panic at the throttling, that a sleep cycle of Windows cures the problem until the next random time it occurs. If you don't sleep cycle Windows, the problem can only be got rid of in bios by messing with the bios (not sure exactly what solves it as it seems different each time). You can change settings in BIOS then put them back and save and it can cure it. If you continue to Windows the problem remains if it wasn't sorted in BIOS. Obviously it's much easier and more effective to let Windows boot then sleep/wake cycle it.
I have studied bios readings and HWmon/AIDA/Core temp/Speed fan readings and I cannot see any reason whatsoever for the CPU to be overheating. Voltages and fan speeds are identical with or without the problem.
It's almost like the motherboard sometimes supplies far more volts than it thinks it's doing.
I wish I knew what happened exactly when a normal Haswell sleep cycle takes place, it would certainly help me to decide.
I also can't get rid of the nagging feeling that somehow Windows is corrupting my UEFI and a could help...for now though, let's just consider CPU and mobo and assume that hasn't worked (but I will try it).
So, you've got a fistful of cash to bet on the cause, do you bet on CPU or motherboard?
Thanks a lot.
I've got a very odd and frustrating problem and before I RMA my board I'm keen to see whether there's even the slightest chance it could be my CPU at fault. I can't let my family use this living room pc and I can't start using it without checking temps are ok.
The board is a Gigabyte Z97n Wi-Fi.
Randomly, probably between every 5 and 10 shutdowns (not restarts or sleep resumes) on average, my CPU starts creeping towards 100c in bios and about 60c in idle in Windows at 800mhz. If you try and do anything demanding, the CPU starts throttling almost instantly. The temps are real, I can feel from the coolers I've tried (H60 and stock intel).
I have narrowed it down to the board or CPU and I can't test either myself. I've tried different ram, psu, heatsinks, with IGP, with discrete GPU and it happens without a hard drive or any unecessary connections at all such as USB or audio and mounted on a cardboard box.
I've also run at stock, overclocked, all BIOS versions, optimised defaults, new battery and flashed main BIOS with backup. It's definitely the board or CPU and I have checked and there is 100% no damage to either from cooler installation (I have photographed both and studied in detail).
If the problem doesn't occur at boot, it never appears during that session. Fortunately this means the pc is usable once I'm sure all is well.
Just to throw a spanner in the works, I've found out by pushing the power button in panic at the throttling, that a sleep cycle of Windows cures the problem until the next random time it occurs. If you don't sleep cycle Windows, the problem can only be got rid of in bios by messing with the bios (not sure exactly what solves it as it seems different each time). You can change settings in BIOS then put them back and save and it can cure it. If you continue to Windows the problem remains if it wasn't sorted in BIOS. Obviously it's much easier and more effective to let Windows boot then sleep/wake cycle it.
I have studied bios readings and HWmon/AIDA/Core temp/Speed fan readings and I cannot see any reason whatsoever for the CPU to be overheating. Voltages and fan speeds are identical with or without the problem.
It's almost like the motherboard sometimes supplies far more volts than it thinks it's doing.
I wish I knew what happened exactly when a normal Haswell sleep cycle takes place, it would certainly help me to decide.
I also can't get rid of the nagging feeling that somehow Windows is corrupting my UEFI and a could help...for now though, let's just consider CPU and mobo and assume that hasn't worked (but I will try it).
So, you've got a fistful of cash to bet on the cause, do you bet on CPU or motherboard?
Thanks a lot.