Comcast Xfinity Internet Speed Test

I have Xfinity and one day I decide to do a speed test, I’m paying for gigabit internet and was barely getting 70 mbps with their provided router. I decided to upgrade and this thing WORKS it was an easy install, a lot smaller than the previous one and handles my internet speed easily no bottlenecks or anything. I have previously bought net gear and ended up coming back I know where my business will always be!

I have had comcast connection for internet. Comcast always claimed that I on my high speed plan but my existing wifi router would never give me that much speed. I switched to ubnt router and voila comcast's claim turned out to be true.

We cut the cable and now use this to stream via Comcast Xfinity internet. No more rental fees on Xfinity modem.

This modem provides great speed for my Gigabit Xfinity internet! With this modem I will be able to get the most out of internet and be able to take it to my next home.

.After upgrading to Xfinity (Comcast) 1 Gig speed tier, I needed a new modem to take advantage. I originally purchased a Motorola MB8600. While the Motorola was indeed fast (spoiler alert: faster than the Arris S33), the Motorola was hugely unstable and unreliable on Xfinity/Comcast (Google it - you'll see its a huge problem). The Motorola was either locking up or losing Internet connection about 5-10 minutes every hour or two! Egads! It was horrible. So Motorola was returned. Enter the Arris SURFboard S33. It activated smoothly and has been rock solid for me on Xfinity/Comcast. It is also a very small modem. The box photos make it *look* large - but it is in fact only 6 x 6 x 2 thick. Quite compact and smaller than most DOCSIS 3.1 modems. It is fast...but, if to be honest it is slower than the MB8600 I had right before this one. My plan is rated at 1000 Mbps down and 40 Mbps up. The Motorola topped out at a very impressive 1014 Mbps down and 41.6 Mbps up. The S33 topped out at 933 Mbps down and 41.7 Mbps up. I ran tests on both modems probably 30 times at all different times of days and night. The above are my best scores. The S33 is consistently about 8-9% slower download speeds compared to the MB8600. But...reliability and stability are far more important than a marginal top-end speed difference. The only other (slight) negative is that the S33 runs a bit warmer than both my older SURFboard model and the Motorola MB8600. It's not hot per se, but does run warmer than maybe most modems. Just make sure to give it good ventilation and it should be fine.

Great Gig speed cable modem for Comcast/Xfinity to go with my high speed mesh network. Easy set up.

Awesome modem. Better than the Comcast Xfinity modem router.

This modem works well, and is compatible with Comcast/Xfinity network.

Upgraded our internet speed with Comcast to 500mb/s so I needed a DOCSIS 3.1 modem. This modem was reasonably priced and has been very reliable. This modem is connected to a Netgear R7000 router so I have never used it cabled directly to a PC, but on the wired connection of the router speeds have been over 500mb/s, close to 600. Highly recommended if you are looking for a DOCSIS 3.1 cable modem.

My Comcast internet tier was upgraded to 1.2Gbps. I purchased the CM2000 to take advantage of the increased speed. Set up was a breeze with the support of a Comcast agent (to update their records) and then the use of the Xfinity app (to complete the set-up). I am now getting over 1Gpbs download (at the modem) with upload of 40Mbs. Highly recommend this modem. My next step is to upgrade my router to NetGear Nighthawk AXE11000 Tri-Band WiFi 6E Router to improve Wifi coverage and speed.