I note from this site that ECC support has been added to the DX58SO from bios update 5930: http://www.intel.com/support/motherboards/desktop/dx58so/sb/CS-029865.htm
Is Intel likely to add registered memory support in the future or is that technically impossible for this board?
My understanding is that Intel's existing dual Xeon boards don't support Nvidia SLI but the DX58SO does, so if registered memory was added I think it would be Intel's only motherboard that supports:
-- ECC + registered memory
-- 1 x the latest Xeon processors (5600 series not officially added to list of supported processors but they do work in the DX58SO - see here: http://ixbtlabs.com/articles3/cpu/intel-xeon-x5680-gulftown-p1.html).
Not many ECC-only memory sticks around so it would make sense to add registered support if you've already gone to the trouble of adding ECC support, right?
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