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Primary pci express x16 slot, Universal pci-e slot (max. x4 mode) – Asus P5KR User Manual

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Chapter 2: Hardware information

Primary PCI Express x16 slot

The primary PCI Express x16 slot supports PCI Express x16 graphics 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.

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 2-34 for the connector location.

• Some PCI Express graphics cards cannot operate on x4/x1 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/x1 mode.

Options for Universal PCI Express slot

PCI Express operating speed

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.

x1 mode [compatible]

Always runs at PCI Express x1 speed.

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).