usb 2.0 speeds which i *think* gives it 120mbit access or something per slot. I'm pretty sure i have used the usb nic to transfer at speeds around 7/8 MegaBytes/sec. 192.168.0.0/24 on sis900 nic and 192.168.1.0/24 on usb200m feeding local lan. btw, i briefly had FC1 on this box which had the most up2date kernel ( made use of the usbnet module there too ) and i *think* the usb nic was getting maximal 100mbit speeds. *shrugs*