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

szarywilq · 04-09-09

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?

totalz · 04-16-09

How much more pressure to the NB if OCing 4 rams instead of 2?

What's the max safe voltage & temp for 965P?

**CL3P20** · 04-16-09

Quote:

Originally Posted by totalz

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.

totalz · 04-16-09

Quote:

Originally Posted by CL3P20

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?

**CL3P20** · 04-16-09

Quote:

Originally Posted by totalz

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

totalz · 04-16-09

Quote:

Originally Posted by CL3P20

..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.

**CL3P20** · 04-18-09

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 ;(

totalz · 04-18-09

Quote:

Originally Posted by CL3P20

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?

**CL3P20** · 04-18-09

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]

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Intel Overclocking Redefined - Interesting P965 / 975X Secrets

04-09-09	#111 (permalink)
szarywilq New to Overclock.net Join Date: Apr 2009 Posts: 5 Rep: 0 Unique Rep: 0 Trader Rating: 0	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?

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