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Pushing 3Ghz NB

post #1 of 42
Thread Starter 
I was sick today and skipped school so i decided to reseat my cpu and redo my overclock.
Tried 4Ghz but couldn't get it stable, even with 1.56V so i gave up on that.
I got 2.8Ghz NB stable with 1.40V and temps with 3.8Ghz 1.42V CPU were only 51°C so i got the idea of a 3Ghz NB. But even with 1.55V CPUNB i can't stabilize it. After 15 sec my second core (it's always this one) fails with "FATAL ERROR: Rounding was 0.5, expected less than 0.4".

I know 1.55V CPUNB is freaking high but i always tought the max V was the same for both the CPU and CPUNB.

So should i try 1.57 ? I'm not really scared of shortening it's lifespan, i'm planning on using it as a homeserver anyway when bulldozer comes out. Or does anyone have an idea on how to get it stable ?
Edited by nicksasa - 2/4/11 at 12:13pm
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post #2 of 42
3000mhz maybe asking a bit much of the chip...don't get me wrong i have seen it been done but on the 6 core 1055 and 1090t processors, I really can't answer for the cpu nb volts cause i never went beyond 1.45v. If your not worried about lifespan, experiment a bit.
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post #3 of 42
Thread Starter 
Yeah i know 3Ghz on a deneb is hard to stabilize but that doesn't prevent me from trying.
If i don't get this stable tonight i'll go for 2.9Ghz.
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post #4 of 42
I have a good chip with a decent NB only takes 1.36v to stabilize 2.8 but for the life of me I can't get 3 stable. Infact the more volts I add the worse the crashes get so if you work something out let me know! Good luck.
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post #5 of 42
I would say shoot for 2.9ish, I also havn't seen 3ghz NB on anything but the 6 core's. Mine will not be stable above 2775ish sadly so I'm settling for just over 2.7ghz. I wouldn't go above 1.55nb, and personally I wouldn't go above 1.5 at least not with Air.
 
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post #6 of 42
Thread Starter 
Oh, i just realised this board's max CPUNB V is 1.5500. So i'm giving up on 3Ghz.
Running prime now with 2898Mhz 1.45V and so far it's still running, but 3 mins means nothing. I'll see how far i can go with max 1.52V.
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post #7 of 42
Quote:
Originally Posted by iamwardicus View Post
I would say shoot for 2.9ish, I also havn't seen 3ghz NB on anything but the 6 core's. Mine will not be stable above 2775ish sadly so I'm settling for just over 2.7ghz. I wouldn't go above 1.55nb, and personally I wouldn't go above 1.5 at least not with Air.
My Northbridge is at 2860 - CPU-NB: 1.37V NB: 1.3V

It's very stable and snappy!
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post #8 of 42
Quote:
Originally Posted by Atomfix View Post
My Northbridge is at 2860 - CPU-NB: 1.37V NB: 1.3V

It's very stable and snappy!
You have a Thuban. They clock better then Deneb on the NB
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post #9 of 42
Thread Starter 
Quote:
Originally Posted by Atomfix View Post
My Northbridge is at 2860 - CPU-NB: 1.37V NB: 1.3V

It's very stable and snappy!
Your sig says 3Ghz ? Anyway thuban has a better IMC.
+ It's still running now. I should be able to get around 2950 with less then 1.50V.


----------Edit--------
2954Mhz 1.45V 5 min stable so far. That's damn close to 3Ghz. If it is 1h stable ill increase it to ~2975 and let it run over night.

(I forgot to change the vcore, i was using that to test 3.9Ghz)

------Edit--------
Failed on core 2, upping the voltage
Edited by nicksasa - 2/4/11 at 1:00pm
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post #10 of 42
Thread Starter 


Going to up it to ~2975Mhz in 15 min. I love this chip, it doesn't do 4Ghz but it's NB overclock is great.
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