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i7 920 4ghz not stable - Page 3

post #21 of 27
Welcome to OCN!
The best way to OC the i7, that I found that worked best for myself, is to isolate the uncore,RAM & CPU and OC one at a time...
Also I dropped LinX & Prime95 for IBT {Intel Burn Test }, during the preliminary testing, get it here http://www.xtremesystems.org/forums/...d.php?t=197835
You can fine tune later if you have to for any other test that you might want. I test all three. Necessary? Maybe? But it is fun!!
Fine tune your QPI/VTT, From BCLK 150 to your desired BCLK, Running 3 quick loops of IntelBurnTest, (about 3 min each test) then your Ram to your, New QPI/VTT,from the 150 BCLK again,with the same Burn test,Again to your your desired Bclk number. Then change your Bclk to 21 and fine tune your VID, All just running 3 loops between testing and bang your done.
Here is a link to {miahallen} 3 Step Overclocking Guides...http://www.overclock.net/intel-cpus/...i5-i7-3-a.html
Happy OCing!!! And let us know how you made out!
Edit: another great guide..http://www.overclock.net/intel-cpus/...920-930-a.html
Edited by H969 - 1/23/11 at 5:26am
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post #22 of 27
Thread Starter 
Thank you for the welcome, I'll check out the 3 step guide and see how it goes. I'm sitting at 3.8ghz @ 1.25v, debating if I wanna hit 4ghz because it increases my temps a lot after increasing vcore to 1.3+. (On P95 my temps go over 75 degrees max load with a H50 corsair cooler)
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post #23 of 27
75c on an i7 is not hot, 90-95c is hot and 100c is max.
But do not do what you are uncomfortable doing.
If you feel stressed then it is not fun and becomes work!
Edit: LOL, I missed the prime95 temps, that is the less stress test you can put on your CPU, and it takes like 24 hours to go through all the testing with it, so I test with prime last.
Your H50 should be good up to about 1.4-1.45V and still be under 90-95c.
You don't want to run at 90-95c 24/7 but for testing it should be fine.
But like I said only do what you are comfortable doing!!
Edited by H969 - 1/23/11 at 11:49am
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post #24 of 27
Thread Starter 
Thanks for the great advice. It has somewhat become work and not fun haha. I'd run prime95 for a night only to wake up to a BSOD, or no BSOD on prime but then failures on LinX. The last vcore I tried was 1.31v, QPI at 1.3, CPU amp differential at 1000MV. I will give it another try when I have more time, school's very time consuming.
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post #25 of 27
Dude., your at 3.8GHZ and trying for that magic 4GHz!
There is not much difference between the two, for everyday use.
But!! it is if you are learning to OC!! There is a huge wall to overcome when OCing pass 3.8GHz for the first time, it is more art than science.
You have lots of time to read and mess around and think about it.
Go to the top of the page and click on user CP and fill out your user specs and proudly post that you have a i7 @ 3.8GHz stable for 24/7 @1.24v and get back to the OCing when you have time, if you think you need it higher.
There are lot's of peep's that would give there eye teeth for an i7 4 core 8 thread @ 3.8GHz
School is way more important!!
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post #26 of 27
Thread Starter 
I'm sure one day I will go and hit the 4ghz mark. Probably over reading week when I have more time to do it Thanks for the encouragement, I am very happy with my 920!
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post #27 of 27
Quote:
Originally Posted by Rakhasa View Post
Thanks for the reply, I was gonna give up 4.0ghz because im not very comfortable with anything over 1.3vcore. Does upping PLL allow me to lower vcore?
Well no, but setting the wrong PLL does cause unstability regardless of whether you are at a vcore that would be stable would you have picked the right PLL.

I have yet to do anything about my CPU AMP/Skews
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