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Mixing unbuffered ECC RAM with registered non-ECC ram

I have a Dell Poweredge R710 server, which has 2 separate banks with 9 slots each. the server came with 6 sticks of registered ECC memory and I have 6 sticks of unbuffered ECC memory.

The server boots with all 6 of either type of memory without complaining.

is it possible that the server could boot both types of memory if each type was populated in its own bank. If so, would there be a bios setting change necessary?
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dgware

You can configure the BIOS for non-ecc ram and it should boot fine.

Can put all the non-ecc in the first bank and ecc on the second bank (NOT the other way around) and it should also work fine.

Personally, i'd use only ECC ram on servers as downtime is a bad thing.
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charlestasse
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I got some from dell and some from crucial, I know ECC and non-ECC isnt the issue - with ECC off in the bios they can be mixed, however charles is correct, mixing unbuffered and buffered in the two different banks did not work.