In S04E01 of "Stargate: SG-1", Carter visits the Asgard homeworld and sees that they're building a new class of ship. The prototype vessel is named "The O'Neill" and Thor states that it is the most advanced vessel the Asgard have ever constructed. He also says that it's the first ship designed to combat the Replicators. It's shiny, almost chrome-looking, and is roughly 30% bigger than a normal Asgard vessel. In the image below, a normal vessel is in the foreground and the prototype is some distance in the background:
Unfortunately, we never see it in action since
the unfinished ship gets piloted out on remote and blown up in the same episode.
Given that the energy-based weapons of the Asgard had no effect on Replicators, and that they literally eat any ships they can reach, I'm curious as to how exactly the vessel was supposed to be better than the existing Asgard vessels.
Has any source mentioned what exactly made The O'Neill better for fighting Replicators?