Server RAM

My Dell 600SC has arrived and I want to upgrade RAM for it.
I tried Kingston 512 DDR ECC SDRAM (not registered) and it didn't work. Will Kingston 512 DDR ECC Registered RAM work? I'd like to know for sure since RAM is non-refundable.
and what should I do with the extra 512 ECC I just bought? Will iit work with normal Athlon XP boards?

thanks a lot.

ML

 

 

 

 

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