ttooddddyy said:More chance of a problem with a slot.
They are also large boardsets and more prone to broken traces due to flexing, also higher current draw leads to toasty 5 volt edge connects
ttooddddyy said:That is to do with the 5 volt and ground connection between the top and bottom boards, it will not reduce the current drawn through the jamma/mvs edge connect as it is resultant for both boards.