Intel i5 2500K @ 4.5ghz - Strange BSOD on Light load or Idle

[DefJae]

Please reply all questions on this topic here http://hardforum.com/showthread.php?p=1037756248#post1037756248


Strangely I can run OCCT and Prime for 5 hours with out any errors, but when I'm browsing the web or listening to music I'd get random BSOD. It happened twice these past week and I'm scratching my head figuring out the root of the problem. Below is my BIOS settings, any idea or input is greatly appreciated...

Ai Tweaker
Ai Overclock Tuner: Manual
BLCK/PCIE Frequency: 100.0
Turbo Ratio: By All Cores
By All Cores: 45
Internal PLL Voltage: Disabled
Memory Frequency: DDR3-1600mhz
DRAM Timing Control: use the rated timings
EPU Power Saving MODE: Disabled


Ai Tweaker\ CPU Power Management >
CPU Ratio: Auto
Enhanced Intel SpeedStep Technology: Disabled
Turbo Mode: Disabled
Long Duration Power Limit: Auto
Long Duration Maintained: Auto
Short Duration Power Limit: Auto
Additional Turbo Voltage: Auto
Primary Plane Current Limit: Auto


Ai Tweaker (in the DIGI+ VRM section)
Load-Line Calibration: Medium
VRM Frequency: Auto
VRM Spread Spectrum: Disabled
Phase Control: Optimized
Duty Control: T.Probe
CPU Current Capability: 100%
CPU Voltage: Manual
CPU Manual Voltage: 1.250
DRAM Voltage: 1.50
VCCIO Voltage: Auto
CPU PLL Voltage: 1.81250
PCH Voltage: Auto
CPU Spread Spectrum: Auto


Advanced\ CPU Configuration >
CPU Ratio: 45
Intel Adaptive Thermal Monitor: Enabled
Active Processor Cores: All
Limit CPUID Maximum: Disabled
Execute Disable Bit: Enabled
Intel Virtualization Technology: Disabled
Enhanced Intel SpeedStep Technology: Disabled
Turbo Mode: Disabled
CPU C1E: Disabled
CPU C3 Report: Auto
CPU C6 Report: Auto

 

[Gorilla]

Any particular message or code with that bsod?

 

[DefJae]

Decided to skip 4.5Ghz entirely and did some research on 4.8Ghz. I was able to run Prime95 In Place Large FFT for 1 hour @ 4.8Ghz using the following settings. I hope this can be some sort of a guide if you are venturing past 4.5Ghz.

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[hiong]

you are not running in offset mode? does that mean your CPU is running at 1.34V even when idle?

 

[DefJae]

No, I'm using speed step so it will only scale to 1.34v if needed. The great thing about this setup is you are not running 4.8Ghz all the time. It will only scale to 4.8Ghz when need be.

you are not running in offset mode? does that mean your CPU is running at 1.34V even when idle?

 

[apehangers]

nevermind

 

[l3uLLDoZeR]

Thats sweet..im using the same setup, i'll shoot for 4.8 at 4.5 stable now! I had to to bump voltage to 1.35, since at 1.34 it would blue screen right when I started prime95.

I have speedstep enabled too so I don't waste power, haven't noticed a slow down with it on.