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Sandy Bridge owners, take note - Page 14

post #131 of 185
Quote:
Originally Posted by i_hax View Post
I'd like to know too... but I'm far more interested in how much it helps rather than why.

Looks like it's time for some more BIOS meddling...
you need to buy thousands of monkeys and train them to type in random amounts into the BIOS until you find an epic overclock
    
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post #132 of 185
Quote:
Originally Posted by Jonesey I7 View Post
The only reason I disagree with this is......

My first two chips ran cooler with higher voltage, and this one runs just as hot as those did with MUCH lower voltage. Which is fine for me, my water keeps the temps in check, and the lesser voltage should keep it truckin for long to come.

@Yuto...... I have found that the utility issued with your motherboard to find voltages the closest to actual.
All that really matters to me is temps, 1.3v at 90C is worse than 1.4v at 60C to me. People running 1.4v for 5GHz but hitting 80-90C load temps make me cringe even while using 1.5v myself.
    
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post #133 of 185
Lowered mine PLL from stock -> 1,65 stable -> 1,55 still running, but looks fine so far.
For stability test I use linx+sp1 50 runs, prime95 small ftt & blend +-4h and some gaming.
My 2500k runs at 4.5Ghz with 1.27v(bios) on a P8P67 pro (1053)
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post #134 of 185
+rep to this

Although I haven't seen what I get stable, I am trying it out. I had 1.315v before to hit 4.4GHz, so I'm seeing how much lower I can go. I tried 1.76v for PLL and that didn't get me down to 1.29v vcore at 4.4GHz. So I'm trying 1.74v for PLL, and seeing if that works.
    
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post #135 of 185
Quote:
Originally Posted by k1ngl3x View Post
Lowered mine PLL from stock -> 1,65 stable -> 1,55 still running, but looks fine so far.
For stability test I use linx+sp1 50 runs, prime95 small ftt & blend +-4h and some gaming.
My 2500k runs at 4.5Ghz with 1.27v(bios) on a P8P67 pro (1053)
Can you post other settings for your current OC?

I have 4.5 running at 1.28v stable 24/7, but 1.27v failed me after some benching. Now I wonder if you got a better batch or if you got better settings. I have PLL at 1.55 atm, enabled PLL Overvoltage, C1E enabled, other reporting disabled, most other settings on Auto.
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post #136 of 185
Trying 1.78 PLL at 1.30v

At 1.76 PLL and 1.30v, I wasn't getting 4.4GHz stable. Power saving features are enabled, voltage droop enhancing features are on.

Currently at 1.78 PLL I'm getting higher temps slightly, but I'm currently running prime95 and haven't crashed (5 minutes in) prime95. I crashed at about 6 minutes at 1.76 PLL and 1.3v.

CPU-Z reads 1.272v, BIOS is set to 1.30v

[edit]: Unstable at 1.78 PLL at 1.30v. I am now testing if 1.76 PLL is stable at 1.315v at 44x multiplier. At auto (1.80 PLL) I am stable at 1.315v at 44x multiplier, so what I'm testing now is to see if 1.76v PLL is actually worse (in my case) at least for the current voltage settings I have.

[edit]: It appears after almost 30 minutes that 1.76v PLL is stable at 44x multi and 1.315v, which is what I was also stable at with 1.80v PLL. I assume a lower PLL is good, so I will stick with 1.76v.

This is with HT on. Not sure what others are setting their gear to (HT on or off).
Edited by PaulWog - 1/23/11 at 4:39am
    
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post #137 of 185
Prime blend just gave an error after 3h49min, will up the vcore to 1.275v. Could be the PLL or maybe I wasn't fully stable at 1.27v ? If this gives the error again I'm upping PLL back to 1.65.
Did get a notice from AI suite that my vcore dropped to 0.400v ??
Under load cpu-z fluctuates between 1.264-1.272-1.280 vcore.



batch# L036B120

running 50 runs linx at the moment




AI tweaker

manual
100
by all cores
45
enabled
1866
disabled
--------
ultra high
auto
extreme
t.probe
120%
--------
manual
1.275
1.53125
auto
auto
1.55000
1.05000
diabled
---------
---------
adv cpu config

45 enabled
all
disabled
enabled
disabled
enabled
enabled
enabled
enabled
enabled

if there is a bios template for the p8p67 pro available, please point me in the right direction

Edited by k1ngl3x - 1/23/11 at 5:01am
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post #138 of 185
Hm, only difference I see is the extra current the cpu can draw in your setup, 120% as opposed to my 110%. That would also explain why you sometimes see higher CPU-Z values than vcore set in BIOS, while I always see values under my 1.28v in CPU-Z.

Hmm, I may give 120% a try, maybe it will give stability under load, which I lack for Linx/AVX/SP1.
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post #139 of 185
Quote:
Originally Posted by Yuto View Post
And here we go, 1.26v did not work out for me, windows would boot, but once I started stress testing I'd get BSOD with 0x0123, which usually means you need more juice.

1.27v works nicely so far, will run prime for an hour to see if it holds



If it does, I will see if I can raise the multiplier with 1.27v intact.
nice pron, first tab.

also, I get that as well, when i boot into Windows. My machine at work has a decent SB setup, and naturally I want to OC it, but CPU-Z reads different voltages as well. I never understood that.
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post #140 of 185
lawl

Regarding the voltages - I kinda do want to put all relevant values into a table and see how the relate to each other and the CPU-Z readings.

So far it seems like BIOS voltage at 100% overcurrent ends up 0.1-0.2 less in CPU-Z, with 110% your CPU-Z is slightly below BIOS under load and at 120% its slightly above BIOS under load. Not sure how PLL plays a role in that and the overvoltage option for PLL.

Need to find out before I give a highoverclock a try.
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