Recently I started looking for a modem to replace my aging Motorola SB4100. Based on the good reviews, I decided to buy the Motorola SB5120. Unfortunately, I found the SB5120 extremely hard to find (Amazon did not have it in stock at the time). The SB5101 however was in stock everywhere for about $50. Out of frustration, I contacted Motorola to ask about availability and the significant differences between the 5120 and the 5101. The Motorola technician that I talked to told me that the reason the 5120 is scarce is that it is no longer manufactured. He also explained that the difference between the two modems is the internal chipset. The 5120 is a TI and the 5101 is a Broadcom. He also said that there is no difference in performance; both are capable of 38 Mbps downstream and 30 Mbps upstream (limited by the cable company's tiers and number of users on the net).
Finally, I asked him which he preferred (since I could still track down a 5120 if I was willing to pay enough...). He stated unequivocally that he preferred the SB5101 and the Broadcom chipset. He also stated that the speed on the modems is artificially capped by the cable companies so that they can sell tiers of service. This modem, he said, has a lot of available overhead so as the broadband companies compete and raise their level of service,...........................
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