Methods and apparatuses are disclosed for providing a bus in a computer system. In one embodiment, an apparatus comprises: a central processing unit (CPU), a bridge coupled to the CPU, a first slot configured to receive a device, where a first portion of the bridge is coupled to the first slot, a second slot configured to receive a device, where a second portion of the bridge is coupled to the second slot, and where inserting a jumper board into the first slot couples the first portion of the bridge to the second slot.