PCI-X 64-Bit Interface. 4 layers PCB board. High Quality 1U Riser Card for any 1U chassis. Gold plated contacts for best connectivity and long life. 64-Bit Direct Plug-in Riser Card . Expansion for 1 slot . Support PCI 32bit/33MHz, 64bit/66MHz, And PCI-X 64bit/66MHz, 100MHz, 133MHz . Size: 158.2mm x 27mm x 20.5mm. Weight: 39g .