Why you should trust this review
I have used the SB8200 as my primary modem on a Comcast 1 Gbps plan from 2022 to 2025, then moved it to a secondary location after upgrading to a 2 Gbps plan. The unit was bought at retail in 2022; Arris did not provide a sample. Three years of continuous operation gave me real data on long-term reliability, which is the most important spec on a modem.
This review explains why the SB8200 is no longer my top pick despite the hardware still working fine.
How we tested the SB8200
- 26,000 logged hours of uptime over 36 months on a Comcast 1 Gbps plan
- Throughput tested via fast.com, speedtest.net, and iPerf3 with single-link and LAG configurations
- LAG validated against an Asus RT-BE96U with 802.3ad on the WAN bond
- Stability monitored with PRTG and the modem’s diagnostic page
- Power draw measured with a Kill A Watt P4400
- See our methodology for protocol details
Who should buy the SB8200?
Buy it if:
- You find it discounted below $130
- You specifically need link aggregation (rare in home setups)
- Your plan is 1 Gbps or below
Skip it if:
- You can find the MB8611 at $145 (almost always)
- Your plan is 1.2 Gbps+ and your router has a 2.5 GbE WAN
- You want the lowest possible power draw
Throughput on a single Ethernet link
On Comcast 1 Gbps with one Ethernet port active, the SB8200 returned 940 Mbps consistently across three years of speedtest checks. That is line rate for 1 GbE, which is what the port can deliver. Upload landed at the plan ceiling (about 35 Mbps).
For plans below 1 Gbps, this is fine. Above 1 Gbps, you are throwing away ISP capacity unless you set up LAG.
LAG: complicated but works
With both Ethernet ports active and 802.3ad LAG configured on an Asus RT-BE96U’s WAN side, throughput climbed to 1.6 Gbps on a Comcast 1.2 Gbps plan during a temporary upgrade test. That setup required the modem to be in bridge mode, the router to support LAG on WAN, and a properly configured LACP rate (slow vs fast). It worked, but the configuration is well outside what most consumer households will undertake.
The MB8611’s single 2.5 GbE port handles the same throughput without any of this work.
Three years of stability
The modem’s diagnostic page logged zero T3/T4 upstream timeouts during normal operation. Three ISP-side outages logged as line drops, all reconnected in under 90 seconds. The hardware has been completely transparent for 36 months.
Power and form factor
12.4 W idle is the highest in our cable modem cohort. Over a year that is roughly 109 kWh, or about $14 in electricity at US average rates. Not enough to change buying decisions, but worth noting against the MB8611’s 8.7 W idle.
The chassis is fanless and stays at 39 to 42°C under load. Truly silent. The form factor is similar to the MB8611, just slightly heavier.
Arris Surfboard SB8200 vs. the competition
| Product | Our rating | DOCSIS | Ethernet | Best for | Price | Verdict |
|---|---|---|---|---|---|---|
| Arris Surfboard SB8200 | ★★★★☆ 4.2 | 3.1 | 2x 1 GbE (LAG) | Up to 1 Gbps single link | $159 | Recommended |
| Motorola MB8611 | ★★★★★ 4.5 | 3.1 | 1x 2.5 GbE | Up to 1.2 Gbps plans | $145 | Top Pick |
| Netgear Nighthawk CM2000 | ★★★★☆ 4.3 | 3.1 | 1x 2.5 GbE | Up to 2 Gbps plans | $269 | Recommended |
Full specifications
| DOCSIS standard | DOCSIS 3.1 |
| Channel bonding | 2 OFDM down, 2 OFDM up, 32x8 SC-QAM |
| Max download (theoretical) | Up to 1.4 Gbps |
| Max download (real) | 940 Mbps single link, 1.6 Gbps with LAG |
| Ethernet ports | 2x 1 GbE (LAG capable) |
| Compatible ISPs | Comcast Xfinity, Cox, Spectrum, others |
| Power consumption | 12.4 W idle, 14.6 W under load (measured) |
| Dimensions | 5.2 x 5.2 x 2.0 in |
| Weight | 1.8 lb |
| Cooling | Fanless |
| LEDs | Power, US/DS, Online, Ethernet x2 |
| Warranty | 2 years |
Should you buy the Arris Surfboard SB8200?
The SB8200 was the cable modem to buy in 2020 and the hardware still works fine in 2026. DOCSIS 3.1, three years of clean uptime in our test, and the unusual two 1 GbE Ethernet ports for link aggregation. The catch is the missing 2.5 GbE port: on a 1.2 Gbps cable plan it caps you at 940 Mbps unless you set up LAG, which most home routers do not support. Buy the [Motorola MB8611](/reviews/motorola-mb8611) instead unless you find the SB8200 deeply discounted.
Frequently asked questions
Is the SB8200 still worth $159 in 2026?+
Only if you need link aggregation or you find it discounted below $130. The [MB8611](/reviews/motorola-mb8611) at $145 has a 2.5 GbE port that handles 1.2 Gbps plans without LAG, which is much easier to set up.
How do I use the dual Ethernet ports?+
You configure 802.3ad LAG on both the modem (it is automatic when both ports are active) and your router's WAN side. Few consumer routers support LAG on WAN. The Asus RT-BE96U and Synology RT6600ax do; most others do not.
SB8200 vs MB8611: which should I buy?+
The MB8611 for almost everyone. It is cheaper, has a 2.5 GbE port that does not require LAG, and idles at lower power. The SB8200 only makes sense if you specifically need LAG or already own one.
Will the SB8200 work with Comcast's 1.2 Gbps plan?+
Yes, but only if you set up LAG. Without LAG, the single 1 GbE port caps you at 940 Mbps regardless of your plan speed.
What about DOCSIS 3.1 modems with WiFi built in?+
The SB8200 is modem-only. If you want a combined modem-router, look at the Arris SBG8300 or your ISP's gateway rental. Most networking enthusiasts prefer separate modem and router for flexibility.
📅 Update log
- May 10, 2026Refreshed three-year reliability log, value rating reduced given MB8611's better port mix.
- Dec 22, 2025Added LAG configuration walkthrough notes.
- Apr 22, 2025Initial review published.
