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ASUS P5K Premium 2-21
2.5.7 AI Slot Detector
This motherboard comes with on-
board LEDs that light up when the
PCIE/PCI devices are not correctly
installed. This is a reminder that
you should reinstall these devices.
Refer to the gure on the right for
the location of the LEDs.
The PCIEx16_1 slot (blue)
supports PCIE x16 cards only.
The AI Slot Detector lights up
when you install a x1 or x4 card
to this slot.
Primary PCI Express x16 slot
The primary PCI Express x16 slot supports PCI Express x16 graphic cards that
comply with the PCI Express specications.
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 for details.
The gure 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 2-30 for the connector location.
•
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.
Options for Universal PCI Express operating speed
PCI Express slot
Auto Automatically optimizes performance
and functionality according to devices
installed
x4 mode [fast] User gets the best performance but this
mode disables the PCI Express x1 slot
x2 mode [compatible] Always runs at PCI Express x2 speed