Motherboard clock speed error

May 28, 2009 at 07:17:02
Specs: Windows XP
I am wondering if you can help.

I am running a AMD XP2600 on a Asus A7S8X. The board has a set of jumpers to define the FSB which I set for my CPU (166MHZ) which is has been running at for ages and perfectly happy.

When I fired her up a couple of days ago, it was booting at 100MHZ rather than the 166MHZ. I get the same result regardless of the jumper settings and when I clock it back up in the BIOS, I just get an error.

Whats gone wrong? Has the motherboard just given way?

I have tried flashing the BIOS but no joy. Any help welcome.


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#1
May 28, 2009 at 07:52:41
The jumper obviously didn't change itself so there was no need to mess with it. All you needed to do was correct the BIOS settings. Since you flashed the BIOS, try using the clearCMOS jumper to clear the BIOS (unplug the power cord 1st), then reconfigure all the settings from scratch.

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#2
May 28, 2009 at 08:04:07
What may have caused the original change is a weak or dead CMOS battery. If you interrrupt power to an ATX system the CMOS battery then holds the selectable BIOS settings. When the battery fails the BIOS reverts to defaults, which would be 100 in the case of the setting in question.

The easy way to know if the settings are being held is to enter the BIOS screens and look at the date. If wrong then setting are probably at default. The default date is the date of the BIOS version.

As long as power to the computer is maintained the CMOS battery doesn't matter. If you unplug the computer or use a power strip to shut off power then the CMOS battery come into play.


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#3
May 28, 2009 at 08:06:32
Thanks for the response.

"The jumper obviously didn't change itself so there was no need to mess with it."

Well my point is that they kind of did! I had made no change to the jumper settings, the machine just booted up with the incorrect freq. and I don't seem to be able to get it to run at the correct one regardless of jumper position or BIOS setting.


I have tried the MB battery and it seems ok. No change to time / date settings either.


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Related Solutions

#4
May 28, 2009 at 08:15:35
The jumper doesn't set the BIOS to only allow 166FSB. The jumper is there to allow 166FSB. If you have other hardware like CPU or RAM that can't run at 166 then it still won't happen.

Check your BIOS settings after unplugingreplugging the computer. If the date is wrong then change the CMOS battery.


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#5
May 28, 2009 at 14:24:25
This is ridiculous. Jumpers don't magically change on their own...they have to be moved. So if you didn't tamper with them before this problem, there was no reason to tamper with them after the problem began. The only logical explanation is the CMOS battery. And since you flashed the BIOS, the settings need to be cleared & then reconfigured from scratch. If you're not willing to accept that, we can't help you.

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#6
May 28, 2009 at 23:06:42
Thanks for the repsonses.

This is ridiculous. Jumpers don't magically change on their own...they have to be moved.
So if you didn't tamper with them before this problem, there was no reason to tamper with them after the problem began.
The only logical explanation is the CMOS battery.
And since you flashed the BIOS, the settings need to be cleared & then reconfigured from scratch.
If you're not willing to accept that, we can't help you.

I am not sure how to make this any clearer Jam:

The PC is ignoring both the CMOS and MB jumper settings and booting up at 100MHZ regardless.

The MB battery and the BIOS is saving other changes (time, LAN on/off etc) but seemingly ignores any reference to the clock speed.

Anyways, thanks for the help everyone. I will continue to mess with the BIOS.

J


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#7
May 29, 2009 at 06:16:02
If that is the case then I suggest that you first CLEAR the CMOS by means of the jumper while the computer is unplugged and then upon restart immediately enter the BIOS screens and rest all values as necessary.

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