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1090T unstable OC in SLI?

post #1 of 22
Thread Starter 
Hello, is having a stable OC at 4.2GHz, in my 1090T, but since the day I rode the 2 nd GTX460 for SLI, it has become unstable, and I have to go down to 4GHz.
But I tried hoe, and took off again the 2nd GTX460, and returns to be stable at 4.2 GHz ....

Why, does this happen?

A greeting.
    
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post #2 of 22
Your cpu is not stable because when you add the second card it has to work harder. But I don't really know what's happening I'm sure someone will clear things up
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post #3 of 22
Crappy PSU?
    
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post #4 of 22
Thread Starter 
Thanks,

The PSU is a TX950w
    
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post #5 of 22
try adding more voltage?
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post #6 of 22
Raise your CPU voltage to 1.5V, increase HT link speed to 2400MHz which will help with SLI data communications speed with the chipset and try to get the Northbridge to 2800MHz at 1.37V CPU-NB

btw are u using the SLI Hacked drivers for Nvidia? Because your mobo is Crossfire capable only you see
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post #7 of 22
Quote:
Originally Posted by Atomfix View Post
Raise your CPU voltage to 1.5V, increase HT link speed to 2400MHz which will help with SLI data communications speed with the chipset and try to get the Northbridge to 2800MHz at 1.37V CPU-NB

btw are u using the SLI Hacked drivers for Nvidia? Because your mobo is Crossfire capable only you see
Don't do that. Leave it at 2000Mhz, anything above or below 2000Mhz is asking for instability. When overclocking the Bclk it is known that you should adjust the HT-Link mulit to keep it as close to 2000Mhz as possible.
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post #8 of 22
your north brige is being worked more due to the increased data. try upping NB voltage?
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post #9 of 22
Thread Starter 
Thanks.

With dreams GTX460 is stable to 1.48 v, and when I have the two seats, but it go to 1.55V is not stable ...

NB I have always to 3000MHz @ 1.35 / 1.375V.

And if course, use the sli patch hack.

I'll try to raise the HT to 2400MHz and see what happens.
    
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post #10 of 22
Quote:
Originally Posted by thealex132 View Post
Don't do that. Leave it at 2000Mhz, anything above or below 2000Mhz is asking for instability. When overclocking the Bclk it is known that you should adjust the HT-Link mulit to keep it as close to 2000Mhz as possible.
Untrue, anything above 2400mhz on the HT decreases performance and is known to help with SLI speed
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