Question about ASUS P4S8X Motherboard

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3x 1GB DDR400 Problem on booting!

I have this Asus P4S8X-X motherboard and now I bought 3 sticks of 1GB each of DDR400 High Density, Non-ECC.

the problem is that the system only boots with 2GB or even 2 of those sticks + 512MB 333MHz.

So, I assume that is a problem with frequency.
What do you suggest me to do? I've updated my Bios and there's an option of maximum 200Mhz for memory !!!!!

Your help is very appreciated since I from Portugal and bought from Ebay (USA) this memory, so I must move quickly.

Thanks in advance.

Posted by on

  • Anonymous Feb 08, 2008

    i have the same problem. just bought 2 more 1 gig pc3200

    will only run with 2 gig. stops at boot up. can someone please help.

  • Ernest Gould
    Ernest Gould Jun 12, 2008

    i bought 2 sticks 1gb ddr333 will only work with one stick



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This is a limitation of the SiS 648 / 963 chipset used on this motherboard.

This SiS chipset officially supports:

3GB max of PC2100/PC1600 memory, or
2GB max of PC2700 memory (PC3200 is also unofficially supported)

Hence the reason you can only run 2 x 1GB sticks of PC2700 or PC3200 (aka. DDR333 or DDR400) memory.

DDR400 is backward compatible so you could slow these stick down in BIOS to PC2100 (DDR266) settings if you want to use 3 x 1GB.

Posted on Jan 09, 2009

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The details for your case can be obtained in this site.....................

read carefully to understand the limitations that arise with your motherboard.


Posted on Jan 22, 2008



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