Very urgent question regarding the FSB frequency for AMD duron 1GHZ

I bought a 1Ghz Duron CPU today, and I have mounted it on an ASUS VIA KM133 board, however, my system doesn't even want to boot up. The fan spins and everything, but nothing appears on the screen, but you can tell there is power to the screen because it lights up and turns to a greyish color.

I mounted my 1.4 Ghz AMD Athlon on the same board, and it boots just fine. I was just wondering what could be the cause of this, and could it be that the FSB frequency was set too high, and how can Ii correct this.

Did I buy a dud CPU?

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On bootup, enter BIOS setup. Set the FSB to 100 MHz and retry.
bass2k1Author Commented:
The screen doesn't even display any text. It is like when you plug the monitor in at teh wall, the tube lights up (well, it kind of glows), but it doesn't display anything, like giving me the option to enter BIOS to set the FSB.
Two choices, with the first being the best.

1. Remount the Athlon and set the FSB to 100 MHz as described above.

2. Clear CMOS with jumper, usually located near the motherboard battery. It should be identified both on the board and in your user's manual. This should set the FSB to the default of 100 MHz.
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bass2k1Author Commented:
Mmm...I will try and remount the Athlon and set it to 100, because it has this Jumper-Free thing, but you can over-ride it with your own settings. It's won't harm my Athlon in any way, would it??
Gareth GudgerSolution ArchitectCommented:
Because most boards these days are jumperless to set the CPU they have problems if you put a different processor in them or if you put a processor in them that is different from what the factory is set to. I know this sounds weird but I went through exactly the same thing with a Soyo board.

I came to find that if you hold how a button (like Shift or whatever the motherboard manual specifies) you can force your way into the BIOS and change the setting. I found out how to do this myself from a tiny obscure paragraph in the Soyo manual about recovering from overclocking.
You cant hurt your Athlon by underclocking, which is what you'll be doing by setting the FSB to 100.
bass2k1Author Commented:
Remounted my Athlon, but the lowes my BIOS goes is 125Mhz. I will go and have a look and see if there is any way I can recover from overclocking my CPU, but with rotten luck the core is probably fried.
I doubt that your Duron is damaged, unless it wasn't any good to start.

Check that the voltage settings for the two processors are the same. If not, you may need to manually set the voltage up for the Duron, and then shut down, and trade processors out.

I am a bit surprised that you cannot set the FSB below 125.
What is the exact model of your motherboard?
bass2k1Author Commented:
I have an ASUS ATV133-VM motherboard. I went to their website to see if there were any jumper settings I could use, but with my luck that was the one page that was under construction, I mean...WHAT ARE THE ODDS!!
If it is currently set to 266, set it at 200.
Along with the jumper page being under construction, I am also unable to get to a download for your manual, so I cant see what the BIOS pages look like. What are your choices for upper end FSB speeds?
bass2k1Author Commented:
Well, in my BIOS I have the following speeds I can set it to:

125, 130, 133, 135, 137, 139, 140, 143 and 145 Mhz.

I actually got my board to run only 100 Mhz with some jumper-trickery, however, now my PC won't even boot. when I turn on the power, there is like a short burst of power going through, but then everything, including my fan and LEDs stop working. Even when I reset there is still nothing. Could it be that maybe the CPU uis "protecting' itself against more damage taht is would shut the PC down?

I afterwards tested the same board with my 1.4 Ghz Athlon, and the board seemed to work fine, so there was no damage there.
If this is a 100MHz Duron, it will most likely not work with your motherboard.

Check this link for an AMD recommended motherboard for your model Duron:,,30_182_869_1073,00.html

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bass2k1Author Commented:
The manual of the motherboard specifies that it is compatible with AMD Duron/Athlon CPUs of 550~1400 Mhz.
bass2k1Author Commented:
I am getting a replacement CPU tomorrow already mounted on my board, so I am calling an end to this post. Thanks alot for your help, and here are your well-deserved points.
Glad I could be of some assistance. Hope it works out for you. Thanks.
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