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e8400 Clock Speed Bouncing

post #1 of 5
Thread Starter 
Hey Folks,

I noticed my e8400 has been bouncing back and forth from 3.599ghz to 3.61ghz. It doesn't even necessarily need to be under load to so. I noticed it did this at times too when it was running @ its standard 3.0ghz it would drop from time to time to 2.997ghz ....I read somewhere about about Cpu PLL voltage and how it can stop this...Any ideas or should this be something i shouldn't be worrying about? My Cpu PLL voltage is currently set to "Auto" as is most of my other voltage settings as they did not need to be tweaked thus far to achieve my current overclock. The only setting i have actually set Voltage wise is my Vcore and its running at about 1.288v in CPU-Z while under load running Orthos. The Vdroop is 0.030, Which puts my CPU @ 1.318v Idle.

I also had been reading that 1.28V was the bare minimum required to maintain a 3.6ghz OC on the C0 chips.... It was stable with the bare minimum and would at times drop to 1.279v so i raised my vcore in the bios by one notch now it does not drop below 1.288v under load.

All in all does this look ok?

Edit: Also i would like to add i do have speedstep and all other CPU "Features" Disabled... Along with CPU/PCIe Spread Spectrums...


Thanks!
Edited by jdubeau1986 - 2/16/11 at 6:45am
Gladius
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Gladius
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post #2 of 5
If you have speedstep disabled, thats why it never goes down from max. Also the reason it is bouncing back and forth is your FSB keeps goin from 240 to 240.01 and back, its normal
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post #3 of 5
Thread Starter 
Excellent what i was hoping for! (Still new to this whole OC business)

I knew that it was not clocking down from max due to speed step. I heard it could possibly cause instability in OC'd CPU's.
Gladius
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Gladius
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post #4 of 5
my q9550 bounce between 3399.79 up to 3400.04Mhz and works normally, so bouncing speed is not a problem. by the way how u enable speedstep, my q9550 is always running 3.4Ghz.
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post #5 of 5
Thread Starter 
It should be an option in the Bios, See attached image. This is not an image of my Bios as i am not at my home pc at the moment, But i do have that option.

Gladius
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Gladius
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