Stock Volts for FSB and NB on P35?

OBLIVIONLORD

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Joined

Dec 11, 2003

• Oct 26, 2008

• #1

I can't seem to find it anywhere on the forum because it's probably hidden good but, what are the stock volts of the P35 chipset and the FSB?

The Overclocking sticky in the cpu section doesn't tell me this number. Also what's considered a 'safe' area for these 2?

Thanks

 

Alien432

Tech Savvy Member

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May 30, 2008

Location

Kansas, USA

• Oct 26, 2008

• #2

I have set manually at lowest and go from there.

 

jason4207

Senior Member

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Nov 26, 2005

Location

Concord, NC

• Oct 26, 2008

• #3

NB - 1.25v
FSB Term. (vTT) - 1.2v(65nm) / 1.1v(45nm)

 

OP

OBLIVIONLORD

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Joined

Dec 11, 2003

• Oct 30, 2008

• Thread Starter
• #4

What are the max volt limits for both on the P35?

Thanks

 

OP

OBLIVIONLORD

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Joined

Dec 11, 2003

• Nov 21, 2008

• Thread Starter
• #5

Anyone know the safe limits for the NB and FSB term on P35?

Thanks

 

hank123

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May 25, 2007

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With Yahweh in Colorado

• Nov 21, 2008

• #6

I dont think you need to touch the FSB much. as for the NB I think 1.55 is ok as long as Temps stay with in check.

 

Nebulous

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Oct 11, 2002

Location

The Empire State

• Nov 21, 2008

• #7

Agreed. 1.55v on the NB should do, just make sure temps are in check. FSB voltage should be around 1.3v

 

nightelph

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Joined

Sep 28, 2004

• Nov 21, 2008

• #8

I run 1.55 24/7, active cooling. You probably only need to go higher if you're pushing around 500fsb.

 

OP

OBLIVIONLORD

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Joined

Dec 11, 2003

• Nov 22, 2008

• Thread Starter
• #9

I have the NB at 1.4v and the cpu at 1.3625. At 435fsb it appears that there is instability when the vtt is at 1.3v as opposed to 1.35. So if I am seeing stability at 1.35v then is that safe even though you all say 1.3?

 

redduc900

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Dec 17, 2000

Location

Portland, OR

• Nov 22, 2008

• #10

A VTT of 1.3 - 1.35v is way too high for an FSB of only 435 MHz and a 45nm dual. You shouldn't need more than 1.1 - 1.15v for that frequency. And w/ an FSB of 500 MHz or lower, you shouldn't need more than 1.5v even w/ 4GB of RAM. Intel spec's the max. VTT at 1.45v, just like the CPU core voltage. I run a VTT of 1.15v and a vNB of 1.45v w/ an FSB of 494 MHz. The CPU and NB GTL reference voltages, including the CPU / NB clock skews are critical to a stable OC. I've also run the FSB up to 530 MHz w/ a VTT of 1.20 and vNB of 1.53, so high voltages aren't necessary w/ a P35 and 45nm dual.

 

OP

OBLIVIONLORD

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Joined

Dec 11, 2003

• Nov 22, 2008

• Thread Starter
• #11

I'm running a Q9550, not a dual. I have 2 systems both with the same model chip, 1 microATX and 1 Regular.

With this P5E-VM, anything lower than 1.35v Vtt while at 435fsb will error on prime95. Doesnt matter how high the cpu or nb voltage is, it still errors unless I increase the vtt. This board also has a terrible vdrop of about -.15 at most while running Intel BurnTest compared to my P5Q-Deluxe board which is barley affects it.

 

Last edited: Nov 22, 2008