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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 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 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 below
and page 4-23 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 2-31 for the connector location.
Options for Universal
PCI Express slot
Auto
x4 mode [fast]
x2 mode [compatible]
•
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
PCI Express operating speed
Automatically optimizes performance
and functionality according to devices
installed
User gets the best performance but this
mode disables the PCI Express x1 slot
Always runs at PCI Express x2 speed
-1
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