The PCI express link design of the Trenton BPX6620 backplane supports PICMG 1.3 server-class SHBs. Two PCI-X slots can support 64-bit/133MHz option cards and eight of the PCI-X slots offer 64-bit/100MHz card support. All of the PCI-X slots are capable of supporting universal, 64 or 32- bit PCI cards. PCI express slot PCIe2 is a x16 mechanical slot driven with a x8 electrical link directly from the SHB. The PCIe1 slot is a x8 mechanical slot which requires a Trenton IOB31 installed on the SHB to deliver a x4 electrical link to the slot. The ATX/EPS, 12V AUX and terminal block power connector options simplify the system wiring.