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sd69 7.1K Views
Mar 17, 2026 5:07 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
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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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17 Comments

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Mar 17, 2026 5:58 PM
39 Comments
Joined Oct 2014
M5910Mar 17, 2026 5:58 PM
39 Comments
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
Mar 17, 2026 7:34 PM
6 Comments
Joined Nov 2018
stewxvMar 17, 2026 7:34 PM
6 Comments
Great find, thank you!
Mar 17, 2026 8:40 PM
1.1K Comments
Joined Mar 2009
ginuwinqbinMar 17, 2026 8:40 PM
1.1K Comments
Damnit just paid full price 2 weeks ago.
Mar 18, 2026 1:59 AM
2.3K Comments
Joined Aug 2015
RedflyerMar 18, 2026 1:59 AM
2.3K Comments
Where are DOCIS 4.0 modems??? The cable companies have been promising it for 2024 and here we are in 2026 nothing.
Mar 18, 2026 2:36 AM
513 Comments
Joined Nov 2009
2rugsandacatMar 18, 2026 2:36 AM
513 Comments
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
Mar 18, 2026 3:26 AM
782 Comments
Joined Dec 2010
silentalarmMar 18, 2026 3:26 AM
782 Comments
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
Mar 18, 2026 11:01 AM
501 Comments
Joined Dec 2009
sd69
Original Poster
Mar 18, 2026 11:01 AM
501 Comments
Quote from Redflyer View quoted comment :
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
Mar 18, 2026 11:04 AM
501 Comments
Joined Dec 2009
sd69
Original Poster
Mar 18, 2026 11:04 AM
501 Comments
Quote from 2rugsandacat View quoted comment :
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.
Mar 18, 2026 11:14 AM
513 Comments
Joined Nov 2009
2rugsandacatMar 18, 2026 11:14 AM
513 Comments
Quote from sd69 View quoted comment :
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
Mar 18, 2026 11:28 AM
501 Comments
Joined Dec 2009
sd69
Original Poster
Mar 18, 2026 11:28 AM
501 Comments
Quote from 2rugsandacat View quoted comment :
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!
Mar 18, 2026 7:50 PM
513 Comments
Joined Nov 2009
2rugsandacatMar 18, 2026 7:50 PM
513 Comments
Quote from sd69 View quoted comment :
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!
Not sure the boot file info was me. Wish you the best - I even called Netgear and they confirmed functionality. You might get a little extra juice on the upload but will likely require a service upgrade. Aka more money...

think xfinity has this listed as approved but others are recommend.

ymmv
Last edited by 2rugsandacat March 18, 2026 at 12:53 PM.
1
Original Poster
Mar 20, 2026 12:44 AM
501 Comments
Joined Dec 2009
sd69
Original Poster
Mar 20, 2026 12:44 AM
501 Comments
Quote from 2rugsandacat View quoted comment :
Not sure the boot file info was me. Wish you the best - I even called Netgear and they confirmed functionality. You might get a little extra juice on the upload but will likely require a service upgrade. Aka more money...

think xfinity has this listed as approved but others are recommend.

ymmv
337 down/ 117 up. Happy camper for $40/month
Mar 20, 2026 11:02 AM
513 Comments
Joined Nov 2009
2rugsandacatMar 20, 2026 11:02 AM
513 Comments
Quote from sd69 View quoted comment :
337 down/ 117 up. Happy camper for $40/month
Good to hear. I was only getting 40 up until it was provisioned "properly" not sure that is a thing
Mar 22, 2026 8:31 AM
782 Comments
Joined Dec 2010
silentalarmMar 22, 2026 8:31 AM
782 Comments
Hooked this up yesterday and it's been a substantial upgrade over my CM1100. No changes to my router (Nighthawk RAX80 from 2019). Cox Gigablast. Over 700 Mbps down and 70 up.

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Original Poster
Mar 24, 2026 4:49 PM
501 Comments
Joined Dec 2009
sd69
Original Poster
Mar 24, 2026 4:49 PM
501 Comments
BTW, I stumbled across this post which provides some excellent information about Xfinity next gen rollout:
https://www.reddit.com/r/Comcast_...ed-speeds/

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