OC Voltage questions

[tecninja]

Have some various questions about an OC i'm doing on a system, mainly about some of the voltages I can mess with.

General info:

C2Q Q9450 Processer (Normally 333 Mhz, 2.66 Ghz)
ASUS P5E X38 MB
Crucial Ballistix (2GB x2) RAM (Rated at 4-4-4-12 400Mhz)

I'm currently running the FSB at 400Mhz for a 3.2Ghz Processor.
RAM is running in 1:1 400Mhz 4-4-4-12

It seems to be stable for the most part, but I have run into random issues in the past, and i'm wondering if any of it is coming from my Voltage Settings. My RAM is speced for 2.2v I believe, but it seems to be running stable at the default 1.8v I wondered if there was any benefit for having this at the lowest setting, or if I should really just up the voltage to something higher because thats what the manufacturer recommends.

Also I'm a bit fuzzy on the North Bridge and what voltages I might need to push that up to. The Default seems to be 1.25v, I think I upped it to 1.27v just for the heck of it when I was OCing.

I think I have a pretty good Idea on the Vcore situation, but I've always wondered what the Rhyme and Reason to setting your North Bridge Voltage was. Also I wondered if higher settings might actually decrease stability in any of the areas if they seem to be running fine currently.

Also 2 other values in my BIOS that are set to "Auto" are CPU PLL Voltage, and FSB Termination Voltage. I kind of wondered if I should be Manually setting either of those to a value, and if so what value might be good.

So anyhow pardon all the random questions, just trying to get a handle on all these different voltages you can play with.

For sake of refrence I consider "Stable" to be 12+ hours (10 or more passes) of Memtest86+, and 12+ hours of Prime95 in each of the Small FFT and Blend tests. with 0 errors returned ever at a given set of settings.

 

[munchies]

Hi i too have been reading around about voltages and learned that when u leave the mobo to auto the voltages for u it puts them higher then needed, what i have done that seems to be a good starting point for someone as nooby as me is i set the cpu level up to Qx9770 i think (it was 400Fsb) then write down all the settings that the mobo chose and then i upped the FSB to 425 and ran prime95 for 12 hopurs and it was stable so i took a chance and upped it to 450 but this time i evan lowed all the voltages the mobo had chose for 400FSB and i've been running prime for 2hours and its stable so far, but still 10+hours to go atleast i might make it 24HRS just to be sure. my idle/load temps with mobo settings at 3.4 was 38c/58c but with my own settings and a highr FSB i'm getting 34c/53c

 

[tecninja]

Oh, I rather thought that "Auto" usually meant it chose the lowest setting available. Also there are still a couple of voltages, like the FSB Termination Voltage and CPU PLL voltage, that I have no idea what they should be set to, so they have been left on auto.

 

[tecninja]

Still Curious on my original Questions, as no one has really answered any of them. I'd also certainly be willing to look over a guide or some such that describes what each of the Voltage values does for purposes of OC and the like. If someone knows of such a document and could provide a link.