Unable to over-clock using the % increase Program of ASUS P5n32-E PLUS MOBO BIOS setting.

Why is the BIOS unable to over-clock using the % increase feature in the Extreme Over-clock section of the Asus P5n32-E SLI PLUS MOBO? This refers to the AI-NOS feature. The PC freezes on boot to BIOS with a dark screen & beeps. I suspect the power supply of 550W (true as in Thermaltake) may be too under-powered. The RAM is suppose to be compatible & PC runs very good in the "Auto" BIOS setting (no over-clocked).
no error messages

Specs.: (3-25-07)
Custom Built Desktop by EComputers, Canada

MOBO: Asus P5N32-E SLI SE PLUS  s/n: 71MCAC373309
BIOS: 6.00 Rev.2 of 2/18/07
Chipset BIOS: Nvidia ver. 42302e31
ACPI BIOS: rev. 0501

CPU: Intel 757 duo core E6600 2.4MHz 4MB FSB 1066MHz
Stock Intel CPU fan

Memory: OCZ Gold XTC DDR2 800 PC-6400 2GB (4 X 512MB)

timings set: "Auto" @ clock 5.0 800 MHz 5-5-15
voltage @ 1.87V

VGA: Asus/Nvidia Geforce 7900GS (256MB)
driver:  (beta Nvidia for Vista 32)

HD: Seagate SATA 320GB model#320620AS (16MB cache) (no RAID)
Seagate SATA 160GB model#ST3160811AS (8 MB cache) (no RAID)
both 7,200 rpm

Optical Drives: 2
Onboard Audio
Onboard Network card
Cold Cathode light

Power Supply: Thermaltake 550W with 120mm fan
Case: Thermaltake Soprano VB1000SWS with three (3) 120mm case fans  
Note: cooling temps.: CPU @ 27C degrees  MOBO @ 34C under slight load.

O.S.: Windows Vista Premium 32-bit (OEM)

I've searched the ASUS Forum for this MOBO & soem other do have this same issue of no use  of AI-NOS or over-clock % increase settings.
Advice given is to not use these features & manuall over-clock. I do not know how to over-clock sucessfully & would feel terrible to ruin my new PC by just trying (failing).
I don't fully appreciate recieiving advice to not over-clock; doesn't answer my question at all.
However, I can easily live with this PC not over-clocked;
just wanted to try the % feature without damaging my PC.
The ASUS % over-clock does work for others who know nothing about over-clocking manually, so that's the issue at hand.
Thank you for your interest/time on my behalf.
Jim (Vineyardtechie)

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That covers a lot of ground.

The basics are:
* raising the cpu multiplyer. If it will let you, some cpus are locked.
* raising the Front side bus speed.

Things to remember:
OC'ing makes more heat. You might need to get better cpu heatsink/fan. And/or more case fans.
Voltages for cpu and memory might need to be raised higher. KNOW WHAT THE LIMITS ARE. Or you will fry something

For you right now, you should be able to bump the FSB up to the 210MHz range (maybe 220MHz) with no problems.

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Forgot to ask, what percentages were you using in Extreme Over-clock section?

Also forget my comment about more case fans. I saw you have 3 120's when I reread the Q.  : /
jamesg1940Author Commented:
Coral47: Thank u for your support.
I had inquired of Asus tech. support & OCZ tech support, re. this same issue.

Asus would not give any comment other than they won't comment on over-clocking due to warranty issues.
OCZ was helpful & gave me the correct resolution:
just go to the "Extreme Over-clock" section of BIOS:
choose AI Over-clock & the % gain sought,
TO 2.0v (from the default 1.87 v).
That procedure allowed the easy over-clock gain of 10%, where I think I''ll leave it.

Temps. now are still low: CPU @ 24-28C & MOBO @ 35C (steady).

All is good to go.
I awarded you a grade of "B" because you didn't specifically address my issue, but then you may not have been familar with this Asus MOBO & it's touted "over-clock" features.

Best to you,
Thank you much.  : )

I have used  the "Extreme Over-clock" section on a couple of mobos. I didn't know the exact setting you used. So I had to start with basics. ; )
Looks like you got it staighten out though. Enjoy you faster system.  <thumbs up>
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