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forum threadsd69 posted Yesterday 05:07 PM
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forum threadsd69 posted Yesterday 05:07 PM

NETGEAR CM3000-100NAR Nighthawk CM3000 DOCSIS 3.1 Mid/high-Split Cable Modem, Up to 2.5Gbps, Black - Certified Refurbished $159.98

$160

$300

46% off
Amazon
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I've been searching for a Mid/High Split cable modem to increase my upload speed on Xfinity. I almost went with the Hitron CODA56 but people are still complaining about the Puma 7 chipset. My other consideration was the Arris S34 but again people had issues. The CM3000 seems the most reliable but also the most expensive. This refurb from Amazon is almost half the cost of new and it has 90 day return policy.

https://www.amazon.com/dp/B0F3FXYWJS

Xfinity modems: https://assets.xfinity.com/assets...evices.pdf

Issues with Puma 7 chipset: https://www.modemguides.com/blogs...VSeOJdS3QX
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I've been searching for a Mid/High Split cable modem to increase my upload speed on Xfinity. I almost went with the Hitron CODA56 but people are still complaining about the Puma 7 chipset. My other consideration was the Arris S34 but again people had issues. The CM3000 seems the most reliable but also the most expensive. This refurb from Amazon is almost half the cost of new and it has 90 day return policy.

https://www.amazon.com/dp/B0F3FXYWJS

Xfinity modems: https://assets.xfinity.com/assets...evices.pdf

Issues with Puma 7 chipset: https://www.modemguides.com/blogs...VSeOJdS3QX

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Model: NETGEAR CM3000-100NAR Nighthawk CM3000 DOCSIS 3.1 Mid/high-Split Cable Modem, Up to 2.5Gbps, Black - Certified Refurbished

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Sort: Lowest to Highest | Last Updated 3/17/2026, 06:39 PM
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Yesterday 05:58 PM
25 Posts
Joined Oct 2014
M5910Yesterday 05:58 PM
25 Posts
Thanks, OP. I have a CM1100 with a 2 Gbps plan and was under the impression that it was sufficient. After doing some research, I realized that even with link aggregation, it isn't—and this is the right approach
Yesterday 07:34 PM
5 Posts
Joined Nov 2018
stewxvYesterday 07:34 PM
5 Posts
Great find, thank you!
Yesterday 08:40 PM
1,067 Posts
Joined Mar 2009
ginuwinqbinYesterday 08:40 PM
1,067 Posts
Damnit just paid full price 2 weeks ago.
Today 01:59 AM
2,285 Posts
Joined Aug 2015
RedflyerToday 01:59 AM
2,285 Posts
Where are DOCIS 4.0 modems??? The cable companies have been promising it for 2024 and here we are in 2026 nothing.
Today 02:36 AM
469 Posts
Joined Nov 2009
2rugsandacatToday 02:36 AM
469 Posts
Time machine I know... but wasn't this $99 a few weeks ago?

Purchased a non refurbished version 6 plus months ago and Comcast/ xfinity doesn't seem to be able to get the advertised speeds to work with this modem. Not sure who is to blame but my guess is the ISP
Today 03:26 AM
752 Posts
Joined Dec 2010
silentalarmToday 03:26 AM
752 Posts
My old CM1100 has started to drop connection multiple times a day. Compatible with Cox so I'm in for 1. Thanks OP
Original Poster
Today 11:01 AM
492 Posts
Joined Dec 2009
sd69
Original Poster
Today 11:01 AM
492 Posts
Quote from Redflyer :
Where are DOCIS 4.0 modems??? The cable companies have been promising it for 2024 and here we are in 2026 nothing.
Only in certain markets (e.g., Colorado City) and only with Xfinity modems. They are years behind on the roll out. It's hard to make large capital investments when you are losing so many customers.

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Original Poster
Today 11:04 AM
492 Posts
Joined Dec 2009
sd69
Original Poster
Today 11:04 AM
492 Posts
Quote from 2rugsandacat :
Time machine I know... but wasn't this $99 a few weeks ago?

Purchased a non refurbished version 6 plus months ago and Comcast/ xfinity doesn't seem to be able to get the advertised speeds to work with this modem. Not sure who is to blame but my guess is the ISP
Look through the Xfinity forums. Assuming your area has mid/high split you should be able to get them to provision it but it requires endless our working your way up the tech support food chain. Some have had success using the Xfinity app with support.
Double check that your modem is on their list of next gen list. I would be surprised the CM3000 hit $99.
Last edited by sd69 March 18, 2026 at 04:07 AM.
Today 11:14 AM
469 Posts
Joined Nov 2009
2rugsandacatToday 11:14 AM
469 Posts
Quote from sd69 :
Look through the Xfinity forums. Assuming your area has mid/high split you should be able to get them to provision it but it requires endless our working your way up the tech support food chain. Some have had success using the Xfinity app with support.Double check that your modem is on their list of next gen list. I would be surprised the CM3000 hit $99.
Appreciate the suggestions. I have tried and spent many hours on it to no end. Tech was out and get 2200 plus street side and never above 1k modem side. Spoke to both US and overseas tier two and supervisors. The boot file is supposedly correct... aka provision. I get the 200 up but not the down and using a device capable of multi down. I had to give up - not common for me.
Original Poster
Today 11:28 AM
492 Posts
Joined Dec 2009
sd69
Original Poster
Today 11:28 AM
492 Posts
Quote from 2rugsandacat :
Appreciate the suggestions. I have tried and spent many hours on it to no end. Tech was out and get 2200 plus street side and never above 1k modem side. Spoke to both US and overseas tier two and supervisors. The boot file is supposedly correct... aka provision. I get the 200 up but not the down and using a device capable of multi down. I had to give up - not common for me.
I'm looking for the upload because I'm running Channels DVR with multiple family members mooching off my subscriptions. Good to know at least the upload works. I'm only paying for 300Mbps service and my current upload is around 41Mbps. I'm hoping to get at least 100Mbps. I figure I have 90 days to see how it works.
So it was probably your post I was reading about the bootfile changes!

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