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Intel Overclocking Redefined - Interesting P965 / 975X Secrets - Page 12

post #111 of 120
I also have P935. Currently I'm overclocking my CPU E2160. I overclocked it from 1.8 to 3.0 (FSB 200x9 to 333x9) with no overvoltage except +0.3 for RAM. And I reached wall at 335, and no overvoltage helps. I think it's because NBCC. So I jumped to FSB 360 and overvoltaged CPU and NB because errors occurs in memtest. Now I have +0.1 in NB and +0.040 CPU. I also loosen timings to 555-17 and lower spd multiplier to 2.
Of course I can try to overvoltage more and reach 390 or more, but my question is:
Maybe when I change CPU multiplier to x8 or less and improve FSB results will be better?
post #112 of 120
How much more pressure to the NB if OCing 4 rams instead of 2?

What's the max safe voltage & temp for 965P?
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post #113 of 120
Quote:
Originally Posted by totalz View Post
How much more pressure to the NB if OCing 4 rams instead of 2?

What's the max safe voltage & temp for 965P?
Answer to the first Q- 2x1's compared to 4x1's is over double the work for the NB.. since you are using 2x more memory channel's and twice as many memory address's

..Are you referring to the NB/MCH voltage for 965? For a daily limit, I would not exceed 1.55v unless you have active cooling on the NB... if so, then 1.6v is perfectly fine. I ran 1.6v for daily use, with RAM speeds between 1100-1230mhz...and FSB right about 460mhz [most of the time], using 4x1 PC8500, on my P5B-DLX.
post #114 of 120
Quote:
Originally Posted by CL3P20 View Post
Answer to the first Q- 2x1's compared to 4x1's is over double the work for the NB.. since you are using 2x more memory channel's and twice as many memory address's

..Are you referring to the NB/MCH voltage for 965? For a daily limit, I would not exceed 1.55v unless you have active cooling on the NB... if so, then 1.6v is perfectly fine. I ran 1.6v for daily use, with RAM speeds between 1100-1230mhz...and FSB right about 460mhz [most of the time], using 4x1 PC8500, on my P5B-DLX.
thanks,

Actually, i'm running 2x1G + 2x2G, so that's even more pressure.

I'm browsing through some of the old posts. The FSB overvoltage is for VTT, which its typical voltage is 1.2v and the absolute max is 1.55v, that I can found in the cpu datasheet. From 965 datasheet, Vcc default 1.25v, max is 1.375v!! Is Vcc the one I should follow?
Edited by totalz - 4/16/09 at 12:25pm
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post #115 of 120
Quote:
Originally Posted by totalz View Post
From 965 datasheet, Vcc default 1.25v, max is 1.375v!! Is Vcc the one I should follow?
..Not quite sure I understand your question..

Are you asking: What is the safe max for NorthBridge voltage..? Or are you concerned with the Vtt/FSBv instead..? I've clocked a few 965's, can't say I remember ever seeing a Vcc setting in the BIOS
post #116 of 120
Quote:
Originally Posted by CL3P20 View Post
..Not quite sure I understand your question..

Are you asking: What is the safe max for NorthBridge voltage..? Or are you concerned with the Vtt/FSBv instead..? I've clocked a few 965's, can't say I remember ever seeing a Vcc setting in the BIOS
From your other thread about temperature and voltage, I can see u get those info from the datasheets. So I'm trying to do the same for northbridge 965. And I just thought I should use the Vcore as the base!

Yes, my question is safe max for NorthBridge voltage. And you have answered me already, I'm just trying to find where u base that on.
LL
Edited by totalz - 4/16/09 at 8:00pm
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post #117 of 120
I base my answer from my experience with clocking 965 chipsets. Regardless of 'spec' certain voltages are mandatory for different FSB/RAM combination's. Just as well..965 boards do not have as many voltage adjustments in their BIOS as newer chipsets do, as such, you have less control over the voltages that are effected by the settings you adjust.

ie- You will find MCH/NB voltage adjustments, but no MCH/NB Ref voltage [for MCH core or VTT]..and as such you will have to use FSBv as well as MCH/NB voltage to adjust both VTT and MCHv.

Its not anything I have read, so I cant link you to information on this..its just what I have learned from my experience as I said earlier. [I love the P5B-DLX, and had 2x fully mod'd for benching...greatest mobo's ever in my opinion, I killed them, before I outgrew them ;(
post #118 of 120
Quote:
Originally Posted by CL3P20 View Post
I base my answer from my experience with clocking 965 chipsets. Regardless of 'spec' certain voltages are mandatory for different FSB/RAM combination's. Just as well..965 boards do not have as many voltage adjustments in their BIOS as newer chipsets do, as such, you have less control over the voltages that are effected by the settings you adjust.

ie- You will find MCH/NB voltage adjustments, but no MCH/NB Ref voltage [for MCH core or VTT]..and as such you will have to use FSBv as well as MCH/NB voltage to adjust both VTT and MCHv.

Its not anything I have read, so I cant link you to information on this..its just what I have learned from my experience as I said earlier. [I love the P5B-DLX, and had 2x fully mod'd for benching...greatest mobo's ever in my opinion, I killed them, before I outgrew them ;(
thanks CL3P20,

I bought this coolermaster heatsink last night. Recommended by my friend, and he said it should help me do some cooling on both ram & NB. http://www.coolermaster.com/products...bcate=1&id=140

I would follow your experience by not exceeding 1.55v for NB.
What max voltage for FSB do you use?
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post #119 of 120
for 65nm and 965p combo, I would stick with 1.35v as a max... 1.3v for 45nm CPU's

You should need ~1.3v FSB for 333mhz-400mhz.. and 1.35v over ~450mhz FSB [assuming 65nm CPU]
post #120 of 120
I'd just like to make sure I understand this by giving a personal example. By trial and error, I stumbled upon a so-far stable setup shown in my sig.

So, if I am clear, the reason for its stability is that 13.5/11=1.227, 1.227x333x4=1634.72 - this is very shortly after the 1600 strap so that although NB latency may be high it is more stable due to being just over the nearest strap. It also explains the drop in some benchmarks.

[I'm a little fuzzy on this bit] If that's true, given the memory is rated for 200MHz and is running at 333, I'm wondering if at this point I'm best off increasing the FSB incrementally, say to see how far I can get to the next strap and remain stable?
[EDIT It suddenly occurred to me I wasn't asking the right question. In my BIOS, my only choices for RAM settings are to set the bus at 2.00, 2.66, 3.33, 4.00, and auto. This leads me to believe that in the case of the RAM, I just need to test the impact of running ram asynchronously. Thoughts on this are especially appreciated.

Here are my calculations with figures chosen to go just slightly over the strap in order to see what incremental increases in FSB can be applied. I apologize if I have this all wrong.

Stock* 13.5x200=2.70GHz
Current, repeated for easy reference 11x333=3.66GHz, NBCC 13.5/11x333x4=1634 (I'm assuming a strap at 1600)
Proposed:
If I provide more room with this,
12.5x310=3.875GHz, NBCC 1.08x310x4=1339.2 (assuming strap 1333)
do you think I'd be able to drive up the FSB incrementally by, say 10 at a time? That is, would this lower starting point allow me to push it further?

The $64,000 question, of course: would 11x363=~4Ghz (NBCC = 1782) be better or worse than 12.5x320=4GHz (NB = 1382)? My gut reaction is that 11x363 is the obvious choice but I now am concerned about stability and the faster memory timings at 12.5x320 must allow for even higher bus speed increases.

I believe I will undertake some testing of my own but I would appreciate your thoughts on the above to let me know if I am on the right track and whether I can narrow my choices. I will report back what I learn but it may take me some time due to the large number of data sets to acquire.

Incidentally, just in case it helps, I suggest an easy way to quickly track the change in NB FSB as the CPU FSB changes.

1. Determine ratio,r e.g. 13.5/11 = 1.227=r
2. Multiply by 4, 4 x r=4.91*=C
3. CPU FSB increase x C = increase in NB FSB
So it's one simple multiplication each time you want to raise the FSB and check the impact to NB FSB.

*You only ever have to do this once unless you change the multiplier. I'm sure there's a kind soul with a talent for scripting who could come up with a little tool for this.

Along the way it partially answers my question above in that starting at 266 with a higher multiplier offers much higher granularity, perhaps more than is supported by my mobo. I'll check.

In closing, I hope this helps but I also hope for your advice as to what is a more or less good limit above or below the strap?

Thanks. Sorry for the long post, particularly from a noob.
Edited by Rebound - 7/17/10 at 10:47pm
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