
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
Primary PCI Express x16 slot
The primary PCI Express x16 slot 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
depending on the type of PCI Express card you install. Refer to the table below and page
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
Options for Universal | PCI Express operating speed |
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PCI Express slot |
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Auto | Automatically optimizes performance |
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| and functionality according to devices |
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x4 mode [fast] | User gets the best performance but this |
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| mode disables the PCI Express x1 slot |
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x2 mode [compatible] | Always runs at PCI Express x2 speed |
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•Some PCI Express graphics cards cannot operate on x4/x2 mode. We
suggest that you install these cards on the primary PCI Express slot (blue) to increase system stability.
•Some PCI Express devices cannot operate on x4/x2 mode.
ASUS P5B Deluxe |