Function riser family

AMR (Audio / Modem Riser 46pins) for AC97 sound/modem + USB
Specified by intel

CNR (Common Network Riser 60pins) AMR w/ LAN + SMBus
Specified by intel

ACR (Advanced Communications Riser) AMR compatible + LAN + DSL + HomePNA + wireless
Specified by AMD/VIA www.acrsig.org