CUSL2 (i815E)
Onboard i752 video: yes
Onboard Audio (AC97): you must ask for it or you probably won't get one with onboard sound
AGP slot: AGP Pro 4X
ATA100: yes
USB: 7 ports total with iPanel, 5 ports without iPanel
CUSL2-C (i815EP)
Celeron support: no PPGA, yes for FC-PGA (533A and above)
Onboard video: no
Onboard audio: you must ask for it or you probably won't get one with onboard sound, but you can get it since its not part of the i752
AGP slot: normal universal AGP4X slot only.
ATA100: yes
CNR: 1 less than the CUSL2
USB: 4 ports, no connector for front iPanel ports