From my understandings each acorn will boost 4 gpu's 30Mh/s so two would gain you an additional 30Mh/s for a total of 60. This is for ETH and that's about it all I know if certain GPU's will gain more or less I guess we have to wait to find out. Who knows what other algo gains will be if any. But it at least looks like it will make the whole system more efficient.