Supermicro PCI-E x8 to PCI-E x8 RISER CARD for 1U RACKMOUNT, Passive. Manufacturer Part Number: Supermicro RSC-RR1U-E8 Features: Form Factor: 1U Fit Type: PCI-E x8 Output Type: 1x PCI-E x8 Design Type: Passive PCI-E Gen2 Support: yes