Asus PCH-DL - Manual (Page 36)

2-18 Chapter 2: Hardware information
2.5.3 PCI slots
The PCI slots support PCI cards such as a LAN card, SCSI card, USB
card, and other cards that comply with PCI specifications.
When installing long PCI cards, it is recommended that you install
them in PCI slot 1, PCI slot 3, or PCI-X slot 2. Long PCI cards installed
in PCI slot 2 and PCI-X slot 1 may interfere with the SATA connectors.
2.5.4 AGP Pro slot
This motherboard has an Accelerated Graphics Port (AGP) Pro slot that
supports AGP 8X (+0.8V) cards and AGP 4X (+1.5V) cards. When you buy
an AGP card, make sure that you ask for one with +0.8V or +1.5V
specification.
Note the notches on the card golden fingers to ensure that they fit the AGP
slot on your motherboard.
Install only +0.8V or +1.5V AGP cards. This motherboard does not
support 3.3V AGP cards.
PCH-DL
PCH-DL Accelerated Graphics Port (AGP)
Keyed for 1.5V