Im thinking of using OrCad PCB Editor for creating a motherboard design due to the enormous costs of Allegro. This would be an 8 layer board, about 10"x8", standard PC components, so LGA socket and BGA, but nothing super fine pitch. My plan for getting around the DDR relative prop requirements is to just leverage an already existing ref design with the same DDR to LGA connector placement and copy the routes. All other interfaces such as PCI-E and various digital display are serial, so dont have relative prop rules. Anybody have any idea how achievable a motherboard design is in OrCad?