kwan2 wrote:and how do i know, if my cable was > 100mbps?
You should be able to go to your cable company's website and look up the plan name from your monthly bill to see the advertised data rate. However, my experience is the >100 Mbps plans are rare (major metropolitan areas) and expensive (over $100 a month with some cable companies). So you would normally know if you had a >100 Mbps plan because you'd be paying so much for that privilege.
If you're just on a standard cable modem plan, you are probably somewhere from 7 Mbps to 15 Mbps, depending on which cable company you use and where you are located.
You can also test your actual data rate (which can be different than your advertised rate) by going to one of many speedtest websites:http://www.speedtest.net/http://www.dslreports.com/stesthttp://www.broadband.gov/qualitytest/
(you don't have to put an address if you don't want to, just put in X for your address and it works)