Dell XPS 720 Black Owner's Manual - Page 162
Audio, Expansion Bus, PCI Express SLOT2, SLOT4
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Audio Type HDA 7.1 channel Expansion Bus Bus type PCI Express x1 and x16 PCI 32-bit PCI (SLOT3, SLOT5, SLOT6) Connector three Connector size 124 pins Connector data width (maximum) 32 bits Bus speed 33 MHz PCI Express (SLOT1) NOTE: If a graphics card is installed in each of the PCI Express x16 card slots in the dual-graphics configuration, the PCI Express x1 card slot is not accessible for use. Connector one x1 Connector size 36 pins Connector data width (maximum) 1 PCI Express lane Bus throughput x1 slot bidirectional speed - 2.5 Gbps PCI Express (SLOT7) Connector one x16 Connector size 164 pins Connector data width (maximum) 8 PCI Express lanes Bus throughput x16 slot bidirectional speed - 20 Gbps PCI Express (SLOT2, SLOT4) Connector two x16 Connector size 164 pins Connector data width (maximum) 16 PCI Express lanes Bus throughput x16 slot bidirectional speed - 40 Gbps 162 Appendix