CPU resets to stock speed after Windows Sleep

[alexisvx]

Hi,
I have successfully O/C my i5 4690k from 3.5ghz to 4.6ghz. It has been stable for over 6 weeks, I play games with no problems and no overheating (below 60c). I also use it for heavy video editing.

However, whenever I put the computer to sleep, after waking up, the CPU speed resets to the default CPU speed of 3.5ghz. When I re-boot it goes back to the O/C speed of 4.6ghz and stays at that speed as long as I use it.

I have run extensive stress testing with no reported errors. Overclocking was done in the Bios, not via software and I have Intel Turbo Boost enabled in the Bios and 'Disable Turbo' is not checked in RealTemp.

Any ideas as to what can cause an overclock reset to default speed after sleep mode in Windows 7?


My Rig:
Windows 7
Motherboard:
Asrock Z97 Extreme 4
CPU:
i5 4690k 3.5Ghz O/C to 4.6Ghz
Gcard:
GeForce GTX 970
CPU cooler:
Noctua NH-D14
PSU:
EVGA 750W ATX12V
RAM:
G.Skill - Ripjaws X
2x4GB (DDR3 2133)
Case:
Fractal Design Define R4

[kalniel]

Not enough voltage on certain lines can cause the CPU to fall back to default speeds on resume from standby, check 5v levels as I think that's the main one for standby voltage.

[alexisvx]

Not enough voltage on certain lines can cause the CPU to fall back to default speeds on resume from standby, check 5v levels as I think that's the main one for standby voltage.

Can you please elaborate? Do you mean I need to check voltage on individuals cores? I am currently running with a Vcore or 1.21.

Thanks

[kalniel]

Vcore is from the 12v line, that might be worth checking, but my suspicion is the 5v line - there should be a value in the BIOS that reports it (possibly not very accurately).

https://en.wikipedia.org/wiki/ATX#Power_supply

[alexisvx]

I am going to work on it this week end and report back.

[watercooled]

Another possibility is a firmware (BIOS) bug. I've just checked your board and one of the updates has 'adjusted sleep function' in the notes. That's a bit ambiguous but it's possible its referring to a bug like this.

http://www.asrock.com/mb/Intel/Z97%2...wnload&os=BIOS

[Bonebreaker777]

I personally prefer 'shut down - power back on' instead of 'sleep' but everybody likes something different.

[alexisvx]

Solution was found! I used ThrottleStop to set the multiplier and it worked.

[rapidracer10]

Are you overclocking from BIOS or windows (or if you even can from windows)

[alexisvx]

Are you overclocking from BIOS or windows (or if you even can from windows)

from BIOS but check my above post, the solution was found.

[rapidracer10]

Yeah I saw, but was just thinking you shouldnt need to do what you did
But if its fine now then no problem