Head-to-head · Best Standalone DOCSIS 3.1 Cable Modems

Motorola MB7621 vs NETGEAR Nighthawk CM2000

Which is the better buy? Side-by-side on rating, price, strengths, and watch-outs — with the published ratings we averaged to get there.

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The short answer

NETGEAR Nighthawk CM2000 comes out ahead by a narrow margin (4.0 vs 4.1). The gap is mostly about multi-gigabit plan users needing reliable performance — read the strengths below before deciding.

Ranked #5 in Best Standalone DOCSIS 3.1 Cable Modems

Motorola MB7621

4.0

3 sourcesall derived$72as of Jul 31

The Motorola MB7621 is a DOCSIS 3.0 cable modem that performs reliably on the right ISP, holding 500 to 900 Mbps with stable connections and running cooler than some competitors. It isn't suitable for plans above 700 Mbps, and its days are numbered: Spectrum plans to end support by October 2026. Wirecutter named it 'the best modem for most people' back in 2019, but those limitations make it a temporary fix for anyone who expects to upgrade.

Strengths

— Operates on DOCSIS 3.0 with 24 downstream and 8 upstream channel bonding
— Runs on a Broadcom chipset that runs cooler than some rivals
— Provides stable connection in the right ISP environment with speeds between 500 and 900 Mbps

Watch-outs

— Not suitable for plans above 700 Mbps due to DOCSIS 3.0 protocol ceiling
— Spectrum is ending support for DOCSIS 3.0 modems on October 28, 2026

$72 · Check Price on Amazon Full review →

Higher ratedRanked #4 in Best Standalone DOCSIS 3.1 Cable Modems

NETGEAR Nighthawk CM2000

4.1

1 source$249.99as of Jul 31

The Netgear CM2000 Nighthawk is a DOCSIS 3.1 cable modem rated to 2.5Gbps, which suits people on faster internet plans. Customer reviews split: some report a real speed jump over older models, others say it performs no better than the CM1200. Setup itself is straightforward, but getting the ISP to activate it can be a fight. Reddit users and Crutchfield reviewers landed on both sides, with the Comcast/Xfinity activation process drawing most of the complaints. It makes sense on a multi-gigabit plan and less so on a standard Gigabit connection.

Strengths

— Supports DOCSIS 3.1 technology for up to 2.5Gbps broadband speeds
— Easy setup process with standard web interface accessible at 192.168.100.1
— Compact design with clear status lights for troubleshooting

Watch-outs

— Does not provide noticeable speed improvements over older CM1200 model for some users
— Requires ISP activation which can be problematic and time-consuming

$249.99 · Check Price on Amazon Full review →

Derived means the reviewer published no score, so one was inferred from their written verdict. Everything else is a number the publisher printed. How we rank.

How they stack up

Motorola MB7621

The Motorola MB7621 is limited to DOCSIS 3.0 speeds, unlike the Arris SB8200 which supports DOCSIS 3.1, but it runs cooler than the Motorola MB8600. Unlike the Netgear CM1000, it doesn't support Gigabit speeds and is not future-proof, and unlike the Motorola MB8611, it lacks 2.5Gbps Ethernet support.

NETGEAR Nighthawk CM2000

The Netgear CM2000V supports 2.5Gbps speeds, unlike the Arris SB8200 which is capped at 1Gbps, but it's less reliable than the Motorola MB8600 in terms of setup ease. Unlike the Motorola MB8611, it lacks 2.5Gbps Ethernet support, and unlike the Arris SBG8000, it doesn't include integrated Wi-Fi.

Specs side-by-side

Spec	Motorola MB7621	NETGEAR Nighthawk CM2000
Docsis Version	DOCSIS 3.0	DOCSIS 3.1
Max Download Speed	500-900 Mbps	2.5Gbps
Downstream Channels	24	32
Upstream Channels	8	8
Dimensions	7.25"L x 2.25"W x 7.88"H	6.8 x 3.7 x 8.2 in
Ethernet Ports	—	1x 2.5Gbps/1Gbps LAN, 1x Coax
Weight	—	1.02lb

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