ECS 661GX-M2 V5 Manual page 23

Chapter 2: Motherboard Installation
4 Secure the metal bracket of the card to the system chassis with a
screw.
8X AGP Slot
You can install a graphics adapter that supports the 8X AGP specification and
has a 8X AGP edge connector in the AGP slot.
CNR Slot
You can install the CNR (Communications and Networking Riser) cards in this
slot, including LAN, Modem, and Audio functions.
PCI Slots
You can install the 32-bit PCI interface expansion cards in the slots.
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