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Please help with P5B Deluxe & E6600 overclocking.

post #1 of 9
Thread Starter 
Hey all,

I recently upgraded to the P5B Deluxe and have tried some o/c'ing out with it and my E6600.

Now, my CPU is Week 24 I believe and my default v-core is 1.325 I think, so all of this means that my potential o/c is not that great and it isn't.

So far I need 1.4625v to get the CPU ORTHOS stable @ 3.2GHz. This gives me a SuperPI time of 15.797 seconds, whatever RAM timings I use.

At 3.2GHz and 1.4625v the CPU idles at around 36°C @ 21°C ambient and fully loads at around 52°C at the same ambient temperature, according to SpeedFan and Asus PC Probe II. TAT reads the cores at around 48°C at the same temperatures. These temps are with fresh (i.e. uncured) AS5 that has only been on the IHS for about 5 hours of operation.

Have a look below for pics of my BIOS settings:







I have four questions atm:

1. Why, when I set the v-core to 1.4625v in the BIOS, does every piece of software I have, detect the v-core as either 1.42v, or, in the case of CPU-Z, 1.416v? Is this "v-droop", or a read error?

2. If the software is reading the v-core correctly, does this mean that the CPU is actually only getting 1.42v? Does "v-droop" mean that, even though the BIOS might be set for 1.4625v, the CPU is only being supplied with 1.42v in this case?

3. I have noticed the drop in v-core displayed in software VS the BIOS setting is consistently around 3% of the BIOS setting value less that the value set in BIOS. With my current v-core, the voltage as displayed by software is 0.0425v less than BIOS setting. 0.0425 / 1.4625 = 2.9%, or, when rounded to a whole number, 3%. This is about the same with all v-core settings. Does this mean I can set my CPU voltage in BIOS as 1.5v and the CPU will only get 1.455v?

4. Based on my BIOS settings (as above) is there any way you think I can improve my current CPU o/c without seriously damaging my CPU or motherboard?

Thanks for your help and advice!

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post #2 of 9
Yes, I do believe you have some v-droop, and you have some more headroom regarding voltage.

I have a week 24 E6600 also, and got that one up to 3.5GHz for benchies (3.4GHz stable). For that, I set the voltage at 1.5V in the Bios, and ended up with something like 1.45V in CPU-Z. CPU-Z does read correctly.

You might also want to try to set your PCI-E frequency at something between 108 and 115 MHz. This might give you a bit more stability, while not damaging any components.

I now also have a week 28 E6700, and that thing seems even more voltage hungry than the week 24 E6600 . Haven't really played a lot with that one yet though... just folding with it now at 3.4Ghz/1.408V (CPU-Z)
    
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post #3 of 9
Thread Starter 
Quote:
Originally Posted by Chozart View Post
Yes, I do believe you have some v-droop, and you have some more headroom regarding voltage.

I have a week 24 E6600 also, and got that one up to 3.5GHz for benchies (3.4GHz stable). For that, I set the voltage at 1.5V in the Bios, and ended up with something like 1.45V in CPU-Z. CPU-Z does read correctly.

You might also want to try to set your PCI-E frequency at something between 108 and 115 MHz. This might give you a bit more stability, while not damaging any components.

I now also have a week 28 E6700, and that thing seems even more voltage hungry than the week 24 E6600 . Haven't really played a lot with that one yet though... just folding with it now at 3.4Ghz/1.408V (CPU-Z)
Thanks for replying.

Great, so 1.5v minus v-droop equals 1.455v actual CPU voltage. Excellent!

I'll try changing the PCI-E frequency then; see if that helps any. How come the PCI-E frequency range you suggested helps? Is this just information you've picked up from people's experiences, or is there some theoretical basis for it?

Any suggestions for the other motherboard voltage options, or the CPU technology enable/disable options?

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post #4 of 9
The PCI-E issue I just picked up here.. I think it was The Duke mentioning it. I just heard about it today, so I have not given it much thought yet

Do increase the Northbridge voltage a bit... that might help also. I disabled as much CPU functions as I could. Definately the vanderpool technology (or virtualization technology) and so on should be disabled.
    
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post #5 of 9
Thread Starter 
Quote:
Originally Posted by Chozart View Post
The PCI-E issue I just picked up here.. I think it was The Duke mentioning it. I just heard about it today, so I have not given it much thought yet

Do increase the Northbridge voltage a bit... that might help also. I disabled as much CPU functions as I could. Definately the vanderpool technology (or virtualization technology) and so on should be disabled.
OK dude, thanks for that .

With regards to the NB voltage. What is the default voltage and what would you recommend setting it to?

Thanks.

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post #6 of 9
Not sure what is the default voltage... sorry

I'd start with the smallest increment the BIOS allows you... I think I usually bump it up by about 0.15V (it goes in steps of 0.05V). If I do remember correctly, on my DFI board, the default is 1.20V and it goes up to 1.35V. I generally just knock it up to 1.35V. Never had an issue.

However, you have a different chipset...so maybe different numbers. ( have not really played with the P965 board here..)
    
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post #7 of 9
Thread Starter 
Quote:
Originally Posted by Chozart View Post
Not sure what is the default voltage... sorry

I'd start with the smallest increment the BIOS allows you... I think I usually bump it up by about 0.15V (it goes in steps of 0.05V). If I do remember correctly, on my DFI board, the default is 1.20V and it goes up to 1.35V. I generally just knock it up to 1.35V. Never had an issue.

However, you have a different chipset...so maybe different numbers. ( have not really played with the P965 board here..)
Well, thanks for your help anyway . I'd REP you, but I don't think I can .

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Q6600 @ 3.6GHz (400x9) Gigabyte EP45-DS3P HD4850 512MB 630/1000 4GB DDR2-800 OCZ Gold Rv.2 
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post #8 of 9
I'm just going to be straight forward here, it's the CPU. I have a week 24 and it isn't the "greatest" for overclocking, I'm at 3.0ghz and it uses 1.39v @ 3.0ghz and 1.05v at 2.0ghz.

I think most week 27 to 30 are good at overclocking, these were not unfortunately. As for the Vdroop? there is some but I can't remember how much is in mine. I know for the Vdimm it's a 0.05v droop.

For CPU? don't know because this here is what I use 24/7:

__________

Highest I've tried? with a x7 multi was 465fsb but with the full multi? I'm gonna test one day with the infamous 400x9 with a 1.55vc on a 1:1 ratio.
post #9 of 9
Still odd... since I have a week 24 that overclocks quite decently, although needing somewhat high voltages (nothing about 1.5V though).
    
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