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The ULTIMATE Sandy Bridge OC Guide + P67A-UD7 Performance Review - Page 23

post #221 of 713
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well its a good thing. many don't use onboard fan headers because it can draw power from the same place the GPUs draw power. and when there is only ONE 12v line into the motherboard from the 24 pin connector grabbing 1.6amps is a lot.

Think about its 1.6x12=19.2 watts

total the GPu expects is 75 watts from the 24 pin.

Total per wire/connector per spec is 13ampsx12v=156

think about all the other things that will use 12v and it adds up.
Edited by Sin0822 - 3/9/11 at 3:30pm
    
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post #222 of 713
So I've gone and read, re-read, re-read some more, and then when I couldn't see straight, read the 1st page overclocking guide again. I can get my 2600K to do 4.6GHz, but nothing less than 1.43v will do. That seems excessive to me, despite that everyone's chip is different. I have PLL enabled. LLC off right now. Anyone, help?
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post #223 of 713
Quote:
Originally Posted by The_Cyb0rg View Post
So I've gone and read, re-read, re-read some more, and then when I couldn't see straight, read the 1st page overclocking guide again. I can get my 2600K to do 4.6GHz, but nothing less than 1.43v will do. That seems excessive to me, despite that everyone's chip is different. I have PLL enabled. LLC off right now. Anyone, help?
If LLC is off, what is your Prime95 load voltage? With my UD3 and LLC off, a bios voltage of 1.42 ended up being a load voltage of 1.35.
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post #224 of 713
Quote:
Originally Posted by compudaze View Post
If LLC is off, what is your Prime95 load voltage? With my UD3 and LLC off, a bios voltage of 1.42 ended up being a load voltage of 1.35.
Even with the latest version of CPU-Z, my vcore was always displaying the same no matter what my bios voltage was: ~1.34 i think. Why is it so different?

So I'd need to raise my voltage in the bios higher to compensate? Or is that where LLC and/or PLL come in?
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post #225 of 713
Quote:
Originally Posted by The_Cyb0rg View Post
Even with the latest version of CPU-Z, my vcore was always displaying the same no matter what my bios voltage was: ~1.34 i think. Why is it so different?

So I'd need to raise my voltage in the bios higher to compensate? Or is that where LLC and/or PLL come in?
That's Vdroop and normal. Enabling LLC should reduce or elminate that.

I wouldn't enable PLL Overvoltage unless you absolutely need to. You may find you can do 4.6 with less voltage with it disabled. It's generally used for getting over a mutliplier wall. I.E., no matter how much voltage you give it, it will not boot past 48x. Enable PLL overvoltage and now you can boot 49x, 50x and maybe more.

I can run Prime95 at 4.8GHz using 1.35V (load voltage) for 24H with PLL overvoltage disabled. If I enable PLL overvoltage using those settings, I crash within 1M. However, I cannot boot 52x+ without PLL overvoltage enabled.
Edited by compudaze - 3/16/11 at 6:58am
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post #226 of 713
Quote:
Originally Posted by compudaze View Post
That's Vdroop and normal. Enabling LLC should reduce or elminate that.

I wouldn't enable PLL Overvoltage unless you absolutely need to. You may find you can do 4.6 with less voltage with it disabled. It's generally used for getting over a mutliplier wall. I.E., no matter how much voltage you give it, it will not boot past 48x. Enable PLL overvoltage and now you can boot 49x, 50x and maybe more.

I can run Prime95 at 4.8GHz using 1.35V (load voltage) for 24H with PLL overvoltage disabled. If I enable PLL overvoltage using those settings, I crash within 1M. However, I cannot boot 52x+ without PLL overvoltage enabled.
Hmmm, interesting. Thanks for the help. I'll mess around with some bios settings again tonight after work.

As for the LLC -- should I start at the extreme setting and work my way down or vice versa?
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post #227 of 713
Quote:
Originally Posted by The_Cyb0rg View Post
Hmmm, interesting. Thanks for the help. I'll mess around with some bios settings again tonight after work.

As for the LLC -- should I start at the extreme setting and work my way down or vice versa?
I would probably start from the other direction. I would try to find the setting that keeps the load voltage as close to the bios voltage as possible.
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post #228 of 713
Quote:
Originally Posted by compudaze View Post
I would probably start from the other direction. I would try to find the setting that keeps the load voltage as close to the bios voltage as possible.
Gotcha. Thanks again.
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post #229 of 713
Thread Starter 
yous houdl use CPU PLL overvoltage it doesn't damage anything.

As for teh vcore, that is a bit odd, it deffinitly shoudl fluctuate, you should try level1 or level2. The normal vdroop on the GB P67A board is a bit much, and cpu-z updated version shoudl show that vcore fluctuating.
    
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post #230 of 713
Wow -- On my freshly installed P67-UD7-B3, with LLC Level 1 I got down to 4.5GHz @ 1.32v. A far, faaaaaar cry from the old 1.4x I needed. How much does the new board play into it? I always got the impression that motherboards aren't all that significant in the overclocking picture -- at least not in the same light that different batches of CPUs can overclock drastically different.
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