New
#51
Kingston does not list the GA-P55A-UD3 in the supported systems list on this page:
Memory Search | Kingston
Here are all of the Gigabyte system listed with UD3 in the name. A Search for P55 in the list returned nothing.
It will be interesting to see if the other stick lists the GA-P55A-UD3.
I'll leave the debate of what this means up to others.