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

Motorola MB8600 vs Motorola MB8611

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

Motorola MB8600 comes out ahead by a narrow margin (4.3 vs 4.2). The gap is mostly about users upgrading to Gigabit plans who want higher speeds — read the strengths below before deciding.

Higher ratedRanked #2 in Best Standalone DOCSIS 3.1 Cable Modems

Motorola MB8600

4.3

2 sources$199as of Jul 31

The Motorola MB8600 is a DOCSIS 3.1 cable modem rated up to 6Gbps, and setting it up takes little effort. Reviewers liked the simple design and found performance reliable, though several noticed it runs hotter than competitors like the Arris SB8200 because the cooling is less effective. It supports WAN Link Aggregation and works with major ISPs including Comcast Xfinity and Cox. Anyone moving up to a Gigabit plan is the right buyer; anyone who cares about premium build quality or a cool-running box isn't.

Strengths

— Capable of DOCSIS 3.1 standard with 6Gbps top WAN speed
— Simple setup process with clear status lights
— Supports WAN Link Aggregation for improved connection

Watch-outs

— Uses less robust cooling design compared to Arris SB8200
— LED status lights can be too bright and require covering

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Ranked #3 in Best Standalone DOCSIS 3.1 Cable Modems

Motorola MB8611

4.2

1 sourceall derived

The Motorola MB8611 is a DOCSIS 3.1 modem with a 2.5Gbps Ethernet port and support for up to 32 downstream and 8 upstream channels. Tech Reviews called it a great modem, pointing to its backward compatibility and AQM for low-latency performance. Firmware is the weak spot: users have reported stability problems, particularly on version 21.3.7, and one switched to an Arris S34 after prolonged trouble. It's approved for Comcast Xfinity, Cox, and Spectrum. Choose it for fast internet, not if you need voice capabilities or can't tolerate firmware instability.

Strengths

— 2.5Gbps Ethernet port for high-speed wired connections
— Fast DOCSIS 3.1 speeds with support for 32 downstream and 8 upstream channels
— Backward compatible with DOCSIS 3.0

Watch-outs

— No voice capabilities
— Has firmware issues reported by some users (specifically 21.3.7 firmware causing instability)

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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 MB8600

The Motorola MB8600 offers higher WAN speeds up to 6Gbps compared to the Arris SB8200's capped 1Gbps, but it's less reliable in heat management than the Arris SB8200. Unlike the Netgear CM1000, it lacks the build quality and ease of setup, and unlike the Motorola MB8611, it doesn't support 2.5Gbps wired connections.

Motorola MB8611

The Motorola MB8611 supports 2.5Gbps Ethernet, unlike the Arris SB8200 which is capped at 1Gbps, but it's prone to firmware issues compared to the Netgear CM1000 which offers more stable performance. Unlike the Motorola MB8600, it doesn't support 6Gbps WAN speeds, and unlike the Arris SBG8000, it lacks integrated Wi-Fi.

Specs side-by-side

Spec	Motorola MB8600	Motorola MB8611
Docsis Version	DOCSIS 3.1, DOCSIS 3.0 32×8	3.1
Max Download Speed	6Gbps	2,500 Mbps
Ethernet Ports	1x 1Gbps LAN, 1x Coax	—
Dimensions	7.25 x 2.25 x 7.88 inches	7.25"L x 2.25"W x 7.88"H
Weight	1.15 lbs	—
Upstream Channels	8 upstream channels	8
Downstream Channels	—	32

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