ECC is really only used for servers and other critical applications.
For average users it does nothing and its slower than normal ram, not to mention rediculously expensive.
I suggest you take a look at the FAQs at <A HREF="http://www.crucial.com" target="_new">http://www.crucial.com</A>. I realize you're looking at RDRAM, but there's still some good info there.
Rob
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