Computer bus rack having an increased density of card slots

A computer bus rack includes at least one circuit board. The circuit board has an increased density of add-on card slots, with the at least one circuit board having a front side and a back side, and the rack comprising a first plurality of slots coupled to the front side, and a second plurality of slots coupled to the back side. The first and second plurality of slots are arranged such that corresponding ones of the first and second slots are in substantial alignment, respectively. Also provided are a plurality of connectors having respective connector-pins extended in a direction substantially perpendicular to and away from the circuit board and having a column and row arrangement within the connectors. The connectors are affixed to the circuit board in alignment with the first and second plurality of slots, and each one of the plurality of connectors has connector-pins that are physically distinct from connector-pins of connectors of the other slots. Note that the slots on the front side and the back side are adapted to mate with add-on cards so as to increase the amount of add-on slots for a given form factor.