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You typically don't get registered memory support on the basic single-socket Xeons. It's more a multi-socket thing.

yeah, none of the E3 xeons, to my knowledge (and I own, let me see. more than five, less than ten) - none of them support registered memory.

They do support unbuffered ECC, which is pretty great, but at least the v2 units I've got are limited to 32gb ram, which stinks.

Xeon E3 vs E5, actually.