How this page is funded: some links here are affiliate links, and Mesh & Signal earns a commission if you buy through them. It costs you nothing extra, it never changes which product we rank first, and we do not publish a price we have not verified. Full disclosure.
Our recommendation is separates, and it is not close. A modem and a router age at completely different rates: modems are dictated by your provider's DOCSIS generation and change every several years, while Wi-Fi standards move much faster. With separates you replace the half that is actually out of date. With a combo you replace both, or keep both.
The case for a combo
One box, one power outlet, one less cable.
Usually cheaper than buying two devices.
One thing to set up and one thing to blame, which genuinely matters if nobody in the household enjoys this.
Better than renting the provider's gateway, which is the real comparison for most people.
The case against, which we find stronger
You cannot upgrade the Wi-Fi without replacing the modem. When Wi-Fi 8 arrives, a combo makes you throw away a perfectly good DOCSIS 3.1 modem to get it.
Combo Wi-Fi is usually mediocre. The radio in a combo is rarely as good as a standalone router at the same total price.
You cannot move the Wi-Fi. This is the big one. A combo must sit where the coax enters, which is usually the worst possible place for a radio. With separates the modem stays at the wall and the router goes somewhere sensible — which is often the single largest improvement available, per the placement rules.
Approved lists are stricter for combos. Fewer models, and provider support for their routing features is patchier.
Try this first
Check the approved list for your speed tier, not just your provider
Providers maintain separate approved-equipment lists for standard, gigabit and multi-gig plans, and a modem that is approved for your ISP may not be approved for your tier. Cable operators are also retiring DOCSIS 3.0 hardware — Spectrum ends DOCSIS 3.0 support entirely on 28 October 2026 — so buy DOCSIS 3.1 or better, and verify the exact model number against your own provider's current list before you order.
Sizing the modem to your plan
Your plan
Modem needs
Our pick
Up to 500 Mbps
DOCSIS 3.1, Gigabit port
Hitron CODA
Around 1 Gbps
DOCSIS 3.1, Gigabit port
ARRIS SB8200
1 to 1.5 Gbps
DOCSIS 3.1, 2.5 Gbps port
ARRIS S33
2 Gbps and above
DOCSIS 3.1 multi-gig, link aggregation
Netgear CM2000 or CM3000
Match the port to the plan. A gigabit-only modem caps a multi-gig plan at roughly 940 Mbps regardless of what you pay for.
Scroll the table sideways to see every column.
The rental-fee arithmetic
This is the actual reason most people are on this page. Equipment fees vary by provider, plan and market, so the honest answer is a range rather than a number: published guides put Verizon Fios, AT&T, Frontier and T-Mobile at no equipment charge, Spectrum between nothing and about $10 a month, and Xfinity's gateway as included with upgrades starting around $15 a month — while other reporting puts Xfinity's standard modem-and-router charge at about $15 and Spectrum's Wi-Fi router at about $5. Read your own bill; that line is the only number that applies to you.
The arithmetic is then simple. Divide the purchase price by the monthly fee and you have the break-even month. At $15 a month a $130 modem pays for itself before month nine; at $5 a month the same modem takes over two years, and owning it is a smaller win. We work each provider through individually on the provider pages.
How we picked
We have not benchmarked these routers ourselves. Specifications come from the manufacturers; performance context comes from outlets that do run labs, named and linked in Sources. The scores are our editorial weighting of those inputs against what a particular kind of house needs, and the rubric is printed on every pick so you can disagree with the weighting rather than just the conclusion. What we do and do not claim.
Quick picks
Ranked by our published scoring rubric (isp compatibility, speed headroom, flexibility, value). Tap any row to jump to the full write-up, or go straight to the retailer from the right-hand column. How we score.
#
Product
Best for
Score
Price
1
Illustrative
ARRIS SURFboard S33DOCSIS 3.1 with a 2.5 Gbps port and approval across Xfinity, Spectrum and Cox — pair it with any router you like.
Scroll the table sideways on a narrow screen. Scores are our editorial assessment from published specifications and independent testing by named outlets — not our own lab results. What we do and do not test.
The picks in full
Illustrative
#1 · The separates route, done right
ARRIS SURFboard S33
ARRIS · Midrange
The SB8200's replacement in practice: same broad approval, plus a 2.5 Gbps port so it can keep up with a faster plan later.
Key specifications
Standard
DOCSIS 3.1
Ports
2.5 Gbps plus Gigabit Ethernet
Approved by
Xfinity, Spectrum, Cox and most cable ISPs
Score 9.4/10
ISP compatibility10.0
Speed headroom9.0
Flexibility10.0
Value8.5
What it gets right
+The 2.5 Gbps port means the modem will not be the thing capping you after a plan upgrade
+Approved almost everywhere, so it moves house with you
What to watch for
−Costs more than the SB8200 for headroom you may not use yet
#ad We do not publish a price we cannot verify, so the button opens Amazon's own listing. How we are funded.
Common questions
Is a modem-router combo better than separate devices?+−
Separates, for most people. Modems and Wi-Fi standards age at different rates, so separates let you replace only the outdated half. More importantly, a combo has to sit where the coax enters — usually the worst spot in the house for a radio — while separates let the router move somewhere sensible.
Will buying my own modem save money?+−
It depends entirely on your provider's equipment fee, which varies from nothing to about $15 a month. Divide the modem's price by that monthly fee to get your break-even month. At $15 a month a $130 modem pays for itself inside nine months; at $5 it takes more than two years.
Do I need DOCSIS 3.1?+−
Yes. Cable operators are retiring DOCSIS 3.0 hardware from their approved lists — Spectrum ends DOCSIS 3.0 support entirely on 28 October 2026 — so a 3.0 modem is a purchase with a known end date. Buy 3.1 or better.
Illustrative
