Asus P5k 2.5.7AI Slot Detector, Primary PCI Express x16 slot, Universal PCI-Eslot (max. x4 mode), P5K DELUXE Slot Detector

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 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 2-30 for the connector location.

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

•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.

2.5.7AI Slot Detector

This motherboard comes with onboard 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 figure 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.

	DET_X1_1
	DET_X16_1
P5K DELUXE	DET_X1_2
	DET_PCI1
	DET_PCI2
	DET_X16_2
	DET_PCI3

P5K DELUXE Slot Detector

ASUS P5K Deluxe 2-21