Asus P5WD2 Motherboard Installation Guide - Page 46
PCI Express x16 slots
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2.5.4 PCI Express x16 slots This motherboard has two PCI Express x16 slots that support PCI Express x16 graphic cards complying with the PCI Express specifications. With two graphics cards installed, the motherboard can enable quad-display. Primary PCI Express x 16 slot for discrete graphics card (blue) Universal PCI-E slot [max. x4 mode] (black) We recommend that you install a VGA card on the primary (blue) PCI Express slot, and install any other PCI Express device on the Universal PCI-E slot (black). Primary PCI Express x16 slot The primary PCI Express x16 graphics card supports PCI Express x16 graphic cards that comply with the PCI Express specifications. Universal PCI-E slot (max. x4 mode) This motherboard also supports a Universal PCI-E slot with a maximum speed of 2 GB/s. The operating frequency of this slot changes, depending on the type of PCI Express card you install. Refer to the table on the next page for details. The figure shows two graphics cards installed on the primary PCI Express x16 slot and the Universal PCI-E slot. If you install two VGA cards, we recommend that you plug the rear chassis fan cable to the motherboard connector labeled CHA_FAN1 for better thermal environment. See page 2-35 for the connector location. 2-22 Chapter 2: Hardware information