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post #11 of 38
Thread Starter 
Quote:
Originally Posted by BababooeyHTJ;15360674 
Generally you can just leave the GTL on auto. Sometimes teaking the GTL can fix a mildly unstable oc instead of just bumping up the vcore a notch or two.

Usually what I did if prime small fft was failing after about 45minutes is tweak the gtl then see if it fails quicker or takes longer. Generally I would just start with .67 and work my way down from there.

I'm pretty sure that the thread that you are looking for. Either way if you plan on overclocking 775 its a great read.

I decided to leave it at AUTO for now.....I tried to use the .678 settings that the equation gave me, but it blue screened after starting Intel Burn Test.
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post #12 of 38
Lol... I was just saying: The Q6600's, for the most part, take some serious volts for anything over ~ 3.4 GHz. You have to take into account that at 3.4 GHz that's already a 1,000 MHz overclock. So in my book, anything over 3.4/3.5 is all gravy for this chip.

With my Mega (cpu at 3.7 1.440v) I get up to 57/62 in Prime95. If I ran IBT it'd be about 70c+. The max "safe" temp for the Q6600 is about 71.4c I think. But I never use IBT, it's too hot and hard on the cpu.

I do 10 hours Prime95 Small FFTs and if the cpu passes that I do 8 hours Blend. Most guys do a bit more but, that's always worked for me.

You should be good for decent oc on that UD3R. It can sure take the voltages.

Good luck.
 
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post #13 of 38
Thread Starter 
I took some of the advice in the various threads and am booting fine.

I went up from 1.3125 vcore to 1.41----and I increased VTT from 1.26 to 1.32 (don't really know if that was necessary since I wasn't messing with the FSB). I switched the multiplier to 9x from 8x.

It failed Prime95 within 2 minutes, but I increased the voltage to 1.4375 and it is currently running Prime without issues so far.

If it runs fine, then can I decrease the VTT, do I even need to mess with it? If it's unstable do I increase voltage again, or VTT?

EDIT: Rounding error on core 4 about 20 minutes in.....
Edited by silvergoat - 10/19/11 at 3:20pm
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post #14 of 38
One more up on the vcore.

Also, try manually setting the CPU Ref after going up one on the vcore.
#1 Set the CPU Term back to stock 1.20
#2 Set the CPU Ref to .667 or the nearest equivalent (.67 I believe it is)
#3 Go back and set the CPU Term to 1.36
#4 The CPU Ref should scale properly for the increased Term

CPU Term works best about 2 notches below the vcore in CPU-Z.

Ref on UD3's

Also try setting these like this:

CPU Clock Drive: 800mv
PCI Express Clock Drive: 700mv
Edited by crashdummy35 - 10/19/11 at 3:58pm
 
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post #15 of 38
You will need to increse Vcore, VTT, and MCH to get it stable. Which one is the question.

What I do when testing chips like 775 is bump Vcore up to 1.45, VTT to about 1.40 and MCH around 1.40 and go to the clocks I want, see if it's stable then start dropping volts later.

65nm Chips like the Q6600 can handle 1.5 to 1.55 vcore no problem as long as temps stay within reason.
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post #16 of 38
Thread Starter 
Quote:
Originally Posted by crashdummy35;15372984 
One more up on the vcore.

Also, try manually setting the CPU Ref after going up one on the vcore.
#1 Set the CPU Term back to stock 1.20
#2 Set the CPU Ref to .667 or the nearest equivalent (.67 I believe it is)
#3 Go back and set the CPU Term to 1.36
#4 The CPU Ref should scale properly for the increased Term

CPU Term works best about 2 notches below the vcore in CPU-Z.

Ref on UD3's

Also try setting these like this:

CPU Clock Drive: 800mv
PCI Express Clock Drive: 700mv

I tried those 4 steps yesterday, but I didn't see the number automatically scale. I'll give it a try again after the next time this test fails.
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post #17 of 38
Thread Starter 
Quote:
Originally Posted by NoGuru;15373043 
You will need to increse Vcore, VTT, and MCH to get it stable. Which one is the question.

What I do when testing chips like 775 is bump Vcore up to 1.45, VTT to about 1.40 and MCH around 1.40 and go to the clocks I want, see if it's stable then start dropping volts later.

65nm Chips like the Q6600 can handle 1.5 to 1.55 vcore no problem as long as temps stay within reason.

I removed 2 sticks of RAM so I'm only 2x2. That should eliminate any instability due to MCH for now. Vcore went up another notch, and now I'm at 40 minutes in prime95.

It turns out that right around 1.45 is going to be where it's at since I'm at 1.44 now. VTT is still 1.32 or 1.34.....It's probably worthwhile to increase VTT next. Temps are max at 58, but it's cool and I think the voltage might be near the limit for me to comfortably allow.
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post #18 of 38
Quote:
Originally Posted by silvergoat;15373208 
I removed 2 sticks of RAM so I'm only 2x2. That should eliminate any instability due to MCH for now. Vcore went up another notch, and now I'm at 40 minutes in prime95.

It turns out that right around 1.45 is going to be where it's at since I'm at 1.44 now. VTT is still 1.32 or 1.34.....It's probably worthwhile to increase VTT next. Temps are max at 58, but it's cool and I think the voltage might be near the limit for me to comfortably allow.

That's good. Get stable with 2x2 RAM and when you are, you know it's only going to be the MCH/MCH Refs that need tweaking.

Like NoGuru said, these 65nm Q6600's are good up to about 1.55v on the vcore. It's usually the heat that holds people back before they even get that far, though. LordXeb runs his at 1.5-something vcore I believe, has for a while too.
 
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post #19 of 38
Thread Starter 
6 hours in P95 so far....

I think I've got a winner here. Any other recommendations? Should I still bump up the Northbridge voltage? The fact that it only ran 40 minutes before removing the two RAM sticks may be a sign that the Northbridge was a little low and it stabilized more once I got the sticks out of there. I did bump up the voltage, but I don't think one voltage adjustment would have completely stabilized it from 40 minutes to over 6 hours, and maybe more.
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post #20 of 38
whistle.gif

1523758.png

Anyways what stepping is the Q6600 you got there?
VID?

If it is a G0 stepping, you may need 1.45-1.52v for 3.6GHz depending on your VID and luck. I can hit 3.6GHz at 1.48v with ease and be 100% stable. BTW, that is on a 450MHz FSB biggrin.gif

These chips really are monsters in their own right.


If you got any questions, feel free to fire away.

Also MCH should be set to 1.4v, maybe a little lower (1.36 should do though). I am running 1.42v on my MCH with no problem AND with 4 sticks of ram 100% stable.
PLL is fine at 1.57 though for mine I think I got 1.59.
Term should be brought up as well. I say to about 1.3 or so. But 1.26-1.32 depending.

Don't be afraid to go high on the voltage with these chips. They run hot but they are like tanks. 1.55v is the max, but I have ran mine at 1.64v for exended periods benching with little issue.


Anyways proof of my setting right now"1935659.png
Edited by Lord Xeb - 10/19/11 at 9:07pm
 
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