Beyond that, there is another good reason to think about your cable modem. If it's more than a few years old, you might not get the Internet speeds you pay for.
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Cable companies are busy upgrading their networks for faster speeds. Naturally, to access these faster speeds requires a newer cable modem.
The newest standard for cable modems is DOCSIS 3 - although DOCSIS 3.1 is coming soon. DOCSIS 3 can have data download rates of 160 megabits per second, or better - four times faster than DOCSIS 2. Sounds great!
But don't run out and grab a new modem just yet. Check with your cable provider to see if your connection uses DOCSIS 3. If your neighborhood network isn't up-to-date, a new cable modem can wait.