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do you know if it is possible to use both ECC and Registered DDR2 SDRAM in a server?

We have a mix of both, but when they are all installed, the server fails to boot.

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up vote 4 down vote accepted

No.

Specifically, when using registered RAM, ALL modules in the system need to be registered. You can't mix and match.

Also: see Crucial.

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Many thanks ewwhite, perfect answer! – Eds Oct 25 '11 at 10:38

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