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Help pushing @3.5MHz Q9450 - Page 5

post #41 of 45
What are the load temperatures? IIRC, those CPUs will have stability issues anything higher than 70°C.
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ケンジ
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post #42 of 45
Quote:
Originally Posted by Cor7ez;15367556 
Thank you KingT.
I've tried your sets, fact is I can't push NB V more than 1.45 or the system once in windows crash losing video signal. If I try to lower NB V the power isn't enough (IMO) to run 450 FSB as I can't load the OS. Any thoughts about this?
I'll try to push little by little the FSB from 410 to what I can achieve with no more than 1.43 NB V

Well you have a X38 chipset (or X48) motherboard and they generate a lot of heat..

Try to handle the heat on NB..

And yes OC by little, by 10Mhz and see how far it goes..

Every time it fails add a bit vNB and test again (set vFSB= 1.30 and CPU GTL to 0.63x)..

Also set CPU multiplier to 6x so that you easily find out your motherboards FSB limit (For testing use Prime95 Large FFT test for at least 3hrs with multiplier @ 6x) ..

Once you have reached your boards FSB limit THEN up CPU multiplier to 8x, add VCore and test your OC with Intel Burn Test for 15 runs..

Keep your Core Temperatures under 75C at all time..

Keep you Vcore and FSB termination voltage under 1.40V at all time..

Keep your North Bridge voltage under 1.50V at all time..


CHEERS..
Edited by KingT - 10/19/11 at 8:44am
     
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post #43 of 45
Thread Starter 
@Ken
The temps of my last stable version during an OCCT test reached only in one core 70°C for a few min, after that they were stable at like 65°C

@KingT
Yep it's an X38. Actually I'm testing on 420 FSB.
Quote:
Originally Posted by KingT;15367978 
Also set CPU multiplier to 6x so that you easily find out your motherboards FSB limit

Can you better explain to me this? I'm not familiar with this method. I can set to 6x but I don't understand the purpouse... What's the difference between this and testing at 8x?
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post #44 of 45
Quote:
Originally Posted by Cor7ez;15368456 



Can you better explain to me this? I'm not familiar with this method. I can set to 6x but I don't understand the purpouse... What's the difference between this and testing at 8x?

This is FSB testing of the motherboard to determine what is the highest FSB that your system is able to run without impact of CPU (Vcore)..

When CPU is @ 8x multiplier then its heavily overclocked (450MHz FSB x 8 = 3.6GHz) and it can cause to make stress test fail..

Now with CPU multiplier @ 6x your CPU is running @ 2700MHz and it would not cause stress test to fail..

If your OC fail in stress test with multi @ 6x then you'll know that it's your motherboard's fault not CPU..

That error would be only related to NB or RAM voltage not via Vcore for CPU..

Once you find out max stable FSB of your board then you try to run it w/ CPU multiplier @ 8x and higher Vcore, and you stress test it with 15 runs of Intel Burn Test (if it fails you just add more Vcore and test again with IBT)..


CHEERS..
     
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post #45 of 45
Thread Starter 
Great! Thank you for the full explanation. I think now I've understood, it's to exclude the CPU from the guilty list.
I'll try this.
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