Asus K8N - Manual (Page 24)

1-14 Chapter 1: Product introduction
1.8.4 AGP slot
The Accelerated Graphics Port (AGP) slot supports AGP 8X/4X (+1.5V) cards.
When you buy an AGP card, make sure that you ask for one with +1.5V
specification.
Note the notches on the card golden fingers to ensure that they fit the AGP slot on
the motherboard.
If installing the ATi 9500 or 9700 Pro Series VGA cards, use only the card
version PN xxx-xxxxx-30 or later, for optimum performance and overclocking
stability.
Install only +1.5V AGP cards.
K8N
®
K8N Accelerated Graphics Port (AGP)
Keyed for 1.5v