I've tried overclocking my cpu to 2.72 ghz and it was stable @ stock voltage. Then i try to set my FSB to 1333 , the computer does boot up , but the FSB rate is automatically set to [Auto] in bios after rebooting. I do have my voltage increased to 1.35 V , HT - 1.36V , DRAM - 2.1V , NB- 1.4V , SB - 1.6V,yet i've also disabled the Saving power features in configuration.However, i tried to set it back to my 2.72ghz configuration, but the bios still set the FSB back to [Auto]. The bios keeps reseting the FSB rate to [Auto]. What should i do to stop it?



This post has been edited by Riggo: Dec 26 2008, 01:51 PM

reset cmos...

CMOS has been reseted , but im still getting the same result. Bios does save Voltages and others , but the FSB and Memory MHZ will be reseted to [Auto] which is default without showing any notice. ><

i had read some reviews about this mobo,
its overclockabilty is low..

All asus board have this problem when it detects wrong voltages selected, setting [AUTO] is useless when u r overclocking on this board. I've been having this problem on my P5N-D for quite sometime before i figure it out. In order to pump up the FSB, u need to raise the NB, HT, SB voltage in order to keep the board at the settings u want or the BIOS will reset or fail to POST.

For Example:
I'm using my E8400 @ 3.8ghz now, with 4 ram modules (if u have 2 modules, u can set the NB, HT to lower)

NB: 1.52v
HT: 1.52v
SB: 1.6v

CPU: 1.3125 (with vdrop its 1.264v)
RAM: 2.11v @ 4-4-4-15 timing
FSB: 1688mhz @ 422mhz ram speed (sync mode, 1:1 ratio)


Note: Check your ram voltage first before pumping it high.

i've set my voltages as u stated, but the result is still the same.

You are sure NB 1.5v? Normally it needs not exceed 1.35v.

@TS,update to latest bios before doing anything first

No way 1.35v is enough for 4 ram modules on nvidia 750i chipset. The default is 1.32v if set to [AUTO]

as long as theres a fan slapped onto the NB heatsink to keep the temp down. it is ok.

This post has been edited by presto86: Dec 26 2008, 06:10 PM

bro, mind taking ss of ur bios?? like that can help u more

it reset the fsb to auto because your OC is fail, this is the CPR function form asus board, it allow u to boot without manually reset the cmos..

I've already updated my bios in the first place.

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Added on December 26, 2008, 8:10 pmMy first try was successful and i tried to reset it to the configuration same as my first time oc , but it still keeps changing back to [Auto].


CPR function will reset everything including voltages and others, but apparently only the FSB is set to auto and others setting are still being saved, therefore i dont think CPR is the problem.

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Added on December 26, 2008, 8:12 pmThis mobo is decent in oc'ing if im not mistaken , there are many people who have been successful to overclock to 3.6 or higher ghz by using this mobo.

This post has been edited by Riggo: Dec 26 2008, 08:12 PM

it reset to default for all setting when serious failure i guess, for small problem, i revert back the fsb only if i not remember wrong. because everytime i fail it boot at stock fsb and i can continue OC from there, no need to set all setting again..

May i ask, hows the temperature of your cpu like in your BIOS?

Try this,set 1200FSB first then raise on 20FSB incremental each time till it hit 1333FSB,might help

around 4x C

EDIT: Im curious why the voltage shown in cpu-z and other softwares is 1.240V , but my BIOS voltage is set to 1.31V , seems weird. , Does anyone know how to fix this?

It does work after the CMOS battery is taken out , but however when i tried OC few times , the AI will automatically disable the FSB option by setting it to Auto always.

May i know what voltages should i fill in below the list?

Core V:
HT V:
DRAM:
NB V:
SB V:

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Added on December 26, 2008, 10:53 pmIt does help me revert back to Auto , but after that i wont be able to change the FSB , it keeps changing the option to Auto.

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Added on December 26, 2008, 11:10 pmThis method works , but still having the voltage problem stated above. , im afraid the BIOS will be reseted again if i go any higher FSB , since the voltage seems stuck @ 1.280V

This post has been edited by Riggo: Dec 26 2008, 11:52 PM

[quote=Riggo,Dec 26 2008, 10:48 PM]
around 4x C

EDIT: Im curious why the voltage shown in cpu-z and other softwares is 1.240V , but my BIOS voltage is set to 1.31V , seems weird. , Does anyone know how to fix this?

It does work after the CMOS battery is taken out , but however when i tried OC few times , the AI will automatically disable the FSB option by setting it to Auto always.

May i know what voltages should i fill in below the list?

Core V:
HT V:
DRAM:
NB V:
SB V:

dats bcos there's vdrop... u set 1.31v on bios but ur mobo vdrop it to 1.24 lor... ur vdrop quite teruk lor...

y dont u try set fsb to 333, vcore set 1.4v, dram set 2.1v, nb set 1.4 see... actually i oso duno how ur bios looks like so duno how to reli guide u >"<

Find vdroop mod??
Should be able to add some voltage??

Alright, heres a pic of P5N-D mobo, can someone enlight me where should i do the pencil mod?

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Added on December 27, 2008, 1:11 ambro ibenq, logon MSN , gonna ask u some questions regarding to this, tq sifu. ^^

This post has been edited by Riggo: Dec 27 2008, 02:11 AM

are you serious about doing a pencil mod? i have -0.05 vdrop on my P5N-D and i still manage to OC. I don think pencil mod will solve ur issue.