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VTT/QPI voltage

post #1 of 15
Thread Starter 
I can run my setup at 1.22-1.23V on the Vcore, but I need 1.4V on the QPI voltage. I know that is abnormally high.

My blck is 191 and my multiplier is 21.

If I try to lower it, I get a 124 Bcc code from the BSOD. Is there anything I can do to lower the voltage and keep it stable?

Thanks!
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post #2 of 15
Yeah wouldn't go over 1.4v on QPI. Drop it back down to 1.25-1.3v and raise the vcore. I'm running 1.368v vcore at load with a 1.3 QPI voltage to get 4.08ghz stable on my Xeon which is basically a i7-860s.
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post #3 of 15
lower it and raise vcore...

1.22v seems low for 4.0, plus the max on Intel data sheets for vcore is 1.55v while the max for QPI & VTT is 1.35v, so if any of the three has to be high the vcore is the safest...
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post #4 of 15
Lower your ram speed and uncore, then you can lower your VTT/QPI voltage a bit.

1.4v is fine for 24/7 imo, 1.45v max for the VTT.
    
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post #5 of 15
If you slacken your memory timings or memory speed you'll be able to reduce your QPI/VTT voltage. I wouldn't worry too much. My QPI/VTT is 1.42 to run @ DDR3 2000MHz Cas 8 which I thin is safe!
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post #6 of 15
Thread Starter 
Thanks guys. When LLC is turned on, that affects the VTT voltage as well right?

I think it is my RAM that is holding it back. I took out a bum RAM chip and I was stable at 1.37 instead of 1.41.

Also, another problem I have been having is that my temperatures during stress test seems to hop all over the place, anywhere from 51-64C, while mainly staying in the 50s. My fourth core is always cooler by a few degrees which is normal.

This has always happened, regardless of which cooler I have been using, so I don't think it is a seating problem.
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post #7 of 15
If you are stressing using Prime95 temps will go up and down depending on the current test. The small fft seem to produce higher core temps.

Not sure whether LLC affects anything but Vcore.
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post #8 of 15
Quote:
Originally Posted by MrTOOSHORT View Post
Lower your ram speed and uncore, then you can lower your VTT/QPI voltage a bit.

1.4v is fine for 24/7 imo, 1.45v max for the VTT.
This.

Though I think with more fine tuning of your ram, NB and oc (inculuding voltages), you will be able to lower your vtt/qpi volt. I started with 1.45 and I'm at 1.36 at 4.3ghz (with 200+mhz oc on ram).
    
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post #9 of 15
Thread Starter 
Thanks guys. I ran Memtest and it passed so it is not the RAM that is holding me back. So I guess I was wrong about the bum RAM chip.

My timings are already pretty loose. 1528 mhz (iirc) @ 8-9-9-24. I tried 9-9-9-24 but i still got restarts and blue screens. Should I loosen them even further?

And the Uncore. Isn't that powered by the VTT voltage? How should I tink around with the uncore?
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post #10 of 15
Quote:
Originally Posted by youra6 View Post
I can run my setup at 1.22-1.23V on the Vcore, but I need 1.4V on the QPI voltage. I know that is abnormally high.

My blck is 191 and my multiplier is 21.

If I try to lower it, I get a 124 Bcc code from the BSOD. Is there anything I can do to lower the voltage and keep it stable?

Thanks!
0x124 = increase/decrease QPI/VTT first, if not increase/decrease vcore...have to test to see which one it is
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