Tom,

If the MB is the one listed in your other post, MSI-6566E, then the 
memory advisor at www.crucial.com has this to say about it..

    * 184-pin DIMM Banking:   3 (3 banks of 1)
    * Chipset:   Intel 845E
    * Error Detection Support:   Non-ECC only
    * Graphics Support:   AGP 4X
    * Max Component Density:   512Mb
    * Max Unbuffered DDR SDRAM:   2048MB
    * Module Types Supported:   Unbuffered only
    * Supported DRAM Types:   DDR SDRAM only
    * USB Support:   2.x Compliant
    * Although it is physically possible to install more memory, the
      system will only recognize the maximum listed. Installing more
      memory may cause major problems. Consult the system's manufacturer
      for more information.Board is limited to 4 banks of memory. Slot
      one will take single or double banked modules, slots two and three
      share the other two banks.

Note that it says non-ECC only. Pay attention to the maximum size also, 
only 2GB, so your best bet is 2x 1GB module. Crucial price is $42.99 each.

Russ Poffenberger
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Tom Waddell wrote:
> Looking for 1GB PC2100 DDR RAM that is NOT ECC REG. About all I find on eBay is the ECC REG type. I think ECC is error checking memory. As far as I know, ECC works but just takes a little longer to boot up.
>
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