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Phenom II X4 955 BE Unstable @ 3.8Ghz, Need Help

post #1 of 14
Thread Starter 
Hi guys, I recently posted a thread a few weeks back on a previous OC goal, but decided to start a new thread so you guys wouldn't have to read thru a lot of irrelevant posts. wink.gif

So I'm pretty new to OCing and have been trying to get my 955 BE stable at 3.8Ghz. So far I have it running at 3.6, but I'm trying to push the chip further.

To reach 3.8 clock I had my setting in BIOS at:

BaseClock*Multiplier: 200x19 (3.8Ghz)

CPU Vcore: 1.45V

CPU/NB Freq: 2400Mhz

I didn't mess with any other values, (although I did previously, but the results were less stable than my settings listed above). My current settings are not stable, my PC only ran for 30 minutes on Prime95 Blend mode before restarting itself. My temps never breached 47C with me cooling in a HAF 922 case and using a Corsair H70 CPU cooler and it idled around 33-34C with C'nQ disabled (though I'm not sure that info is totally relevant, but I wanted to let you know just in case).

I admit, I'm not really sure what I'm supposed to be putting the CPU/NB Freq to, and only have a vague idea as to what voltage I'm supposed to put my CPU Vcore to with that level of an overclock.

Can anyone here help me get more into the know and attain a stable OC?

Thanks!
post #2 of 14
Quote:
Originally Posted by theDARKW0LF View Post
Hi guys, I recently posted a thread a few weeks back on a previous OC goal, but decided to start a new thread so you guys wouldn't have to read thru a lot of irrelevant posts.

So I'm pretty new to OCing and have been trying to get my 955 BE stable at 3.8Ghz. So far I have it running at 3.6, but I'm trying to push the chip further.

To reach 3.8 clock I had my setting in BIOS at:

BaseClock*Multiplier: 200x19 (3.8Ghz)

CPU Vcore: 1.45V

CPU/NB Freq: 2400Mhz

I didn't mess with any other values, (although I did previously, but the results were less stable than my settings listed above). My current settings are not stable, my PC only ran for 30 minutes on Prime95 Blend mode before restarting itself. My temps never breached 47C with me cooling in a HAF 922 case and using a Corsair H70 CPU cooler and it idled around 33-34C with C'nQ disabled (though I'm not sure that info is totally relevant, but I wanted to let you know just in case).

I admit, I'm not really sure what I'm supposed to be putting the CPU/NB Freq to, and only have a vague idea as to what voltage I'm supposed to put my CPU Vcore to with that level of an overclock.

Can anyone here help me get more into the know and attain a stable OC?

Thanks!
well i would say try to up the n/b voltage a bit and i know the pII chips don't like a multi over 18.5. try 18x 215 @1.475v's or 1.5v's, n/b 1.28 V's. the pII's can take a lot of voltage, 1.575 is the degrading point.
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post #3 of 14
Thread Starter 
Thanks for the reply, I'll get back to you with the results shortly...

Also, just a quick thing to note, whenever I enter my OS, the vCore is not set to v1.45, but v1.42, and when I run Prime95, it drops to v1.38. Does this have anything to do with that thing I've read about called vdroop? If so, what is it? And is there some way I can stabilize the voltage fluctuations in the BIOS or something?

EDIT:
Quote:
Originally Posted by Asustweaker;12086344 
n/b 1.28 V's

So when you say to set the n/b to 1.28 V's, do you mean the NB Voltage area in the BIOS or the CPU/NB area? I read somewhere that the NB Voltage is best set to auto most of the time and the CPU/NB Voltage is what you should be modifying?
Edited by theDARKW0LF - 1/21/11 at 12:08pm
post #4 of 14
Thread Starter 
Not sure how much attention this thread is getting... I would appreciate some input!
post #5 of 14
Raise your CPU/NB to 2600-2800, it'll help increase stability. Keep in mind your also going to have to up the CPU/NB voltage which will increase heat. Yeah your experiencing a little bit of vdroop which isn't terrible, try raising your CPU voltage to 1.45-1.5 to keep it stable at 3.8 also.

Edit: and not to knock the first response but you should be fine with just raising the multi to OC. I didn't touch the CPU freq at all just raised the multi til it got unstable, added voltage, and kept on that path to 4.0 stable
Edited by kev012in - 1/21/11 at 1:18pm
    
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post #6 of 14
The difference in vcore is indeed called vdroop. Nothing to worrie about really as long as you are within the safe limits of the chip.

Regarding the NB voltage, 1.28 is fine, no need to raise it right now. Just drop the multi to 18 like mentioned before and start raising the baseclock. Try to keep ht link between 2000 and 2200.
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post #7 of 14
Thread Starter 
Quote:
Originally Posted by kev012in View Post
Raise your CPU/NB to 2600-2800, it'll help increase stability. Keep in mind your also going to have to up the CPU/NB voltage which will increase heat. Yeah your experiencing a little bit of vdroop which isn't terrible, try raising your CPU voltage to 1.45-1.5 to keep it stable at 3.8 also.
My CPU/NB is set to 2580, which coincides with the increase in my bus freq from 200 to 215. I have my CPU/NB voltage @ 1.28v, NB Voltage @ auto, CPU Vcore @ 1.475v, ratio @ 18x and the HT Link also increased from 2000 to 2150 from the upping of the bus.

It ran on Prime95 for 22 min before restarting itself. Is there anything I should be changing here? Should I be upping the CPU/NB Voltage more? If so, how high? Also, is it unwise to leave the HT Link at 2150? Should I lower it back down to 2000?

Thanks for your response.
post #8 of 14
Thread Starter 
Quote:
Originally Posted by Pir View Post
The difference in vcore is indeed called vdroop. Nothing to worrie about really as long as you are within the safe limits of the chip.

Regarding the NB voltage, 1.28 is fine, no need to raise it right now. Just drop the multi to 18 like mentioned before and start raising the baseclock. Try to keep ht link between 2000 and 2200.
OK, so you're saying I should have the NB Voltage at 1.28v? Because I read elsewhere that it should often be left on auto, and so I set the CPU/NB Voltage to that value instead. May that be the cause of my instability?

Again, the vdroop is resulting in my vcore not passing 1.40v when it's actually set to 1.475v when running on Prime95.

EDIT: One more thing to note, my DRAM Frequency is set to 1433MHz, when the norm is 1600Mhz, this is due to the Bus sitting at 215, so if I were to leave the DRAM at 1600 with the Bus increase, it'd be in the 1700s and I'm not sure whether that's stable?
Edited by theDARKW0LF - 1/21/11 at 1:30pm
post #9 of 14
That's about right. Set nb voltage to 1.28 and keep cpu/nb on auto.
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post #10 of 14
Quote:
Originally Posted by theDARKW0LF View Post
My CPU/NB is set to 2580, which coincides with the increase in my bus freq from 200 to 215. I have my CPU/NB voltage @ 1.28v, NB Voltage @ auto, CPU Vcore @ 1.475v, ratio @ 18x and the HT Link also increased from 2000 to 2150 from the upping of the bus.

It ran on Prime95 for 22 min before restarting itself. Is there anything I should be changing here? Should I be upping the CPU/NB Voltage more? If so, how high? Also, is it unwise to leave the HT Link at 2150? Should I lower it back down to 2000?

Thanks for your response.
keep the ht link around 2000, 2150 is ok. if you are gonna keep it there raise the ht voltage 2 or 3 notches. turn the n/b up to around 2800, higher n/b speeds will really help stability. not to mention give you performance. if the chips revision is a c3 the cpu/nb should be around 1.3v's or so, n/b at 1.25-1.3v's ish. try to also up your mem voltage, say .1v's. raising the reference clock raises memory speed. if the voltage doesn't stabilize your memory, loosen the timings one notch in each of the primary feilds. IE 7-7-7-20, go to 8-8-8-22.
good luck
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