Instruction: Extract information from the supporting document to answer the given question.

Input:
Question: What is the upload and download rate? An important detail to leave out. Thanks.
Document: I understand Comcast still does not have firmware for the Motorola modems so they will not function with their cable head end systems.Apparently if I pay added monthly fees to Cox, I can even get better download/upload speeds with this SB6180 DOCSIS 3 modem. ***** UPDATE 09/19/2013 *******The SB6180 is still running strong for over 9 months now.
This SB6180 is just a cable modem that can support 8 download channels and 4 upload channels. Your  cable ISP may not support all 8 down and all 4 up channels. They may also charge a premium service fee for providing 8 down and 4 up channels.I think this is the better Docsis 3.0 cable modem out there presently. Without the included router such as found in the gateways (e.g., SBG6580), this unit should stay cooler and be more reliable over the long term.
I love it, thanks.
Thanks for a great modem, and super fast free shipping. Plugged in and worked great! Will recommend to many other in need of a good Doc 3 Modem.Thanks again!
This is a very high quality modem with many good features, but it won.twork on Comcast. Therefor I cancelled my purchase. I rate the item andseller very high, but check out ISP approved list first!
Thank goodness it fits. Someone did reply to my email and I'm thankful for that as not many customer service out there are willing to correct mishaps or explain what happend. Apparently the cable got lost in shipment. No big deal, as they quickly corrected the situation. Whoever the rep is, thanks. Other than that, the 3.0 DOCSIS is worth the upgrade with it's multi-chanels.
works perfectly with my Cox Internet connection. Very fast at both up and download speeds. The modem actually shipped with the incorrect power adapter, but that is an issue with the packaging, not with the product itself...as soon as it was powered up, it worked flawlessly!
Speed is as advertised. Noticeable difference in movie download times from Netflix. No dropping and COX cable in my area (Chespaeake, VA) can use at least the earliest version of DOCSIS 3.0.
When my old modem crashed (and I know nothing about these things, "Thanks installers!") When my old cable modem with Cox cratered-out, this was the modem he brought to me. Its smaller than the other one and seems to have more slots for air circulation which I would mark as a plus. I happened to get interested tonight when I saw the Amazon suggestions on a site I was looking at unrelated products.
After upgrading my internet speed I had to upgrade my modem from a Docsys 2 to a D3. I have been using this for about a week now and am completely satisfied. On my 50mb service plan I routinely clock my download speed at 46-48mbs. I did suffer a bit of buffering on one movie I tried to watch on netflix but it only happened once and didn't last long so it may have simply been a problem on their end.
Answer: SB6180: 300-343Mbps download / 131Mbps Upload.