> Comcast installs the cable modem to either a USB port, if available, or a
network card.  Could someone tell me which is preferred (faster, more
reliable)?  If a network card is better, what card is recommended? Thanks.

I have tried both types of connections with my cable modem and did not
notice any difference in speed at all. My advice to you is go with a network
card and leave your USB ports available for other devices that may need them
later on, like if you decide to add a USB scanner or Webcam.

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