Key takeaways
- For Optimum internet (no phone), any DOCSIS 3.1 certified modem works on every cable tier, including 300, 500, and 1 Gig.
- Optimum cable tops out at 940 Mbps wired, so a modem with one Gigabit Ethernet port is enough for all three plans. You do not need a pricier 2.5 Gigabit modem.
- Optimum Voice (home phone) and Optimum Fiber both require Optimum's own gateway. You cannot bring your own modem for those.
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Buying your own modem for Optimum removes the monthly equipment rental fee, which can save you well over $100 per year. The good news is that picking a modem is simple. Below is exactly what works for each Optimum plan in 2026, in plain English.
Optimum cable speed tiers in 2026
Optimum offers three cable internet plans. Find your plan on a recent bill, then match it to a modem in the table below.
- Optimum 300: up to 300 Mbps download, 20 Mbps upload.
- Optimum 500: up to 500 Mbps download, 20 Mbps upload.
- Optimum 1 Gig: up to 940 Mbps download, 35 Mbps upload.
What modem does Optimum require?
For internet-only service, Optimum asks you to use a DOCSIS 3.1 certified modem for all internet speeds. Older DOCSIS 2.0 modems are not allowed at all. A 24 or 32 channel DOCSIS 3.0 modem may still connect on plans up to 500 Mbps, but Optimum warns you may not get your full speed, so DOCSIS 3.1 is the safe choice for any plan. You can confirm the latest rules on the official Optimum certified modems page.
Optimum compatible modems by speed tier
| Optimum plan | Speed (down / up) | Modem you need | Top picks |
|---|---|---|---|
| Optimum 300 | Up to 300 / 20 Mbps | DOCSIS 3.1, one Gigabit port | NETGEAR CM1000, ARRIS SB8200 |
| Optimum 500 | Up to 500 / 20 Mbps | DOCSIS 3.1, one Gigabit port | ARRIS SB8200, Motorola MB8600 |
| Optimum 1 Gig | Up to 940 / 35 Mbps | DOCSIS 3.1, Gigabit port | ARRIS SB8200, Motorola MB8600, NETGEAR CM1000 |
Best modem for Optimum 300
The NETGEAR CM1000 is a simple, reliable DOCSIS 3.1 modem with a single Gigabit port. It handles the 300 Mbps plan easily and is one of the most affordable ways to stop renting. The ARRIS SURFboard SB8200 is another solid choice if you want a little extra headroom for the future.
Best modem for Optimum 500
The ARRIS SB8200 is a popular DOCSIS 3.1 modem with a stable Broadcom chipset and two Gigabit ports. The Motorola MB8600 is also excellent and includes Active Queue Management, which helps keep lag low during gaming and video calls.
Best modem for Optimum 1 Gig
Because Optimum's 1 Gig cable plan delivers up to 940 Mbps over a wired connection, a standard Gigabit Ethernet port is enough. The ARRIS SB8200 and the Motorola MB8600 are both strong picks. If you want the lowest-cost option that still does the job, the NETGEAR CM1000 works well too. You can browse the full lineup on our Optimum compatible modems page or our DOCSIS 3.1 modems collection.
Two important exceptions
Optimum Voice (home phone): If you have phone service through Optimum, you must use the Optimum gateway. Store-bought phone modems will not activate on your account, so a customer-owned modem is only for internet-only households.
Optimum Fiber: Fiber plans (1 Gig, 2 Gig, and 8 Gig) do not use a cable modem at all. They connect through Optimum's fiber equipment, so you cannot bring your own modem for fiber service.
How to activate your own Optimum modem
Setup takes only a few minutes. Connect the coaxial cable to your modem, plug in power, then connect your Wi-Fi router to the modem's Ethernet port. If the modem does not come online by itself, call Optimum and give them the modem's MAC address, which is printed on the label on the back. Keep that number handy, since it makes activation faster.
Frequently asked questions
What modems are compatible with Optimum in 2026?
For Optimum internet without phone service, any DOCSIS 3.1 certified modem works on all speed tiers. Popular, well-supported picks include the NETGEAR CM1000, ARRIS SB8200, and Motorola MB8600.
Do I need a DOCSIS 3.1 modem for Optimum?
Yes, DOCSIS 3.1 is the recommended standard for every Optimum plan. DOCSIS 2.0 modems are not allowed, and DOCSIS 3.0 modems may not reach your full speed, so DOCSIS 3.1 is the reliable choice.
What is the best modem for the Optimum 1 Gig plan?
The ARRIS SB8200 and Motorola MB8600 are top choices for Optimum 1 Gig. Since the plan delivers up to 940 Mbps wired, a modem with a single Gigabit port is enough, so you do not need to pay extra for a 2.5 Gigabit model.
Can I use my own modem with Optimum Voice?
No. If you have Optimum home phone service, you must use the Optimum gateway. Retail phone modems will not activate, so bringing your own modem only applies to internet-only accounts.
Can I use my own modem with Optimum Fiber?
No. Optimum Fiber plans use Optimum's own fiber equipment instead of a cable modem, so a customer-owned modem is only for Optimum's cable internet plans.
How much can I save by buying my own Optimum modem?
Optimum charges a monthly fee to rent its gateway. Buying your own modem usually pays for itself within several months and can save you over $100 per year after that.
Will a DOCSIS 3.0 modem work with Optimum?
A 24 or 32 channel DOCSIS 3.0 modem may connect on plans up to 500 Mbps, but Optimum warns you may not get your full speed. For dependable performance on any plan, choose DOCSIS 3.1.
