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Help with 4gig stable OC please

post #1 of 8
Thread Starter 
I'd asked this in another section on accident but I wanted some answers so I am moving it over here (no one seemed to want to answer it there)

so....sig rig is the beast.

trying for last 2 days to get a 4g stable OC on air, I usually run it 3.7g with stock volts and it's solid there, but when I make the jump to 4g settings, in order to get anything done it seems to want 1.5v just to get windows loaded. I can run some short benches, but any lengthy stress testing fails on the 3rd core within anywhere from 1 minute on OCCT to about 1 hour in P95.

I have successfully booted into windows and stayed stable enough to run a couple 3d benches but I want it rock solid so I can see about going back to folding.

question is that, is 1.5 too much volts, and what should NB volt set to? or should I also adjust CPU/NB volt or what? (yes I know these chips can take 1.55v, but should I have to?)

and I am pretty sure someone will ask if I've tried just using the multi and core voltage to get there, the answer is yes I have.
 
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post #2 of 8
Have you overclock your NB Frequency at all? if you haven't then you shouldn't need to bump the CPU-NB Voltage at all_

4ghz stable on air is hard to acquire from my experiences. Personally I think 1.5volts is a little too high for my taste especially going for a 24/7 overclock.

How much extra voltage does your motherboard give the processor under load? Take for instance if you have set your bios cpu voltage to 1.5 and under load CPU-Z shows 1.55 then your motherboard gives it an extra .05 volts increase_

Although we have to take into account that software monitoring on voltage isn't super accurate
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post #3 of 8
Thread Starter 
Quote:
Originally Posted by httuner View Post
Have you overclock your NB Frequency at all? if you haven't then you shouldn't need to bump the CPU-NB Voltage at all_

4ghz stable on air is hard to acquire from my experiences. Personally I think 1.5volts is a little too high for my taste especially going for a 24/7 overclock.

How much extra voltage does your motherboard give the processor under load? Take for instance if you have set your bios cpu voltage to 1.5 and under load CPU-Z shows 1.55 then your motherboard gives it an extra .05 volts increase_

Although we have to take into account that software monitoring on voltage isn't super accurate
I've tried it numerous times both ways (with no OC on the NB and with it) and to answer your other question if memory serves the difference is about .03v between my bios and cpu-z

I thought the same thing when I first kicked it to 1.5 "whoa....gonna fry tonight..." yeah that's too close to threshold for me but it held it with minimal jump in temp on idle, maybe 3c difference and on load like7-8c higher than norm, norm being low 40's.
 
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post #4 of 8
Quote:
Originally Posted by Rhylian View Post
I've tried it numerous times both ways (with no OC on the NB and with it) and to answer your other question if memory serves the difference is about .03v between my bios and cpu-z

I thought the same thing when I first kicked it to 1.5 "whoa....gonna fry tonight..." yeah that's too close to threshold for me but it held it with minimal jump in temp on idle, maybe 3c difference and on load like7-8c higher than norm, norm being low 40's.
There's really no other way to put it, looks like you'll have to bump the CPU Core voltage some more just to be able to be stable at 4ghz via Stress testing

Otherwise, I could suggest you give the Advance Clock Calibration option a try_ I don't know much about it but from a few readings, it seems that when you have a weaker core than the other cores which are able to be stable at a certain clock/voltage_ you could apply ACC to the weaker core and it'll help make it stable. But thats all the knowledge I have of ACC lol
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post #5 of 8
Just wondering, are you up'ing the FSB and slowing increasing the CPU Multiplier or are you just adjusting the CPU Multiplier? I've played around with both and found that the latter is the best way to go for stability. Generally you also want to overclock the NB, HTT, and RAM as well so it compensates for the low CPU Frequency. If 3.7 at stock is your limit or safety, try playing around with NB Frequency and RAM.

My NB was able to run at around 2800 mhz, but at 1.3v which I did not want to have for 24/7 overclock. But, I noticed a 4 FPS increase in GTA IV from 2400 mhz. My HTT Link was at 2600 mhz as well, but it's now at 2400 mhz.

I got to 4.5 ghz on my 965 at 1.5v, but I stay at 4.2 ghz at 1.45v (OCCT at 59c). You should take notice in your load temps as well.
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post #6 of 8
Thread Starter 
@ dHAPPY .. I've done both methods and both have the 3rd core fail above 3800 I'm starting to think I got a bum chip here, I can suicide it to 4125 long enough to get a cpu-z valid but it is no where near stable, no benchies at all there

my motherboard seems to like about 2600 on the HTT but can't support that in the NB, it hits a wall at 250 there. I would be happy just to get to that 4.2 stable of yours as my cooler and case do an excellent job of keeping the thing cool I think.

@httuner .. I am not so confident in my knowledge to fool with that, I'd be afraid to brick something if I went the wrong way or something
 
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post #7 of 8
Just a last note** Overclocking the HTT can actually cause more unstable conditions than to just leave it alone_ Overclocking the HTT can hinder performance instead of increasing it
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post #8 of 8
Thread Starter 
dang it, pushed it some more again today and got a good stable all around OC at 3700 ish with ram and HTT (not HT Link) both OCed, ran OCCT for 5 hours no errors and got bored so I tried running some 3DMark 06. It will not run all the way through, 06 stops dead and just basically appears to exit the program altogether at the first CPU test...I even went so far as to take everything back to stocks and it's still doing this, any ideas?

Edit: just realized this part of my issues could be not having all the windows updates in yet..
Edited by Rhylian - 5/11/11 at 7:15pm
 
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