Just my opinion, but populating 3 dimms (or more) AND using HyperX AND an Ultra-D = potential issues galore.
A LOT of mobos seem to have issues with HyperX RAM and the Ultra D is KNOWN to be "picky" about RAM.
Based on the above, I'd pass on the HyperX unless you can fairly easily return it for full refund.
Just my $0.02.