If you’ve shopped for a new router recently, you’ll likely have seen something new. Router manufacturers are making a big deal about the use of new 2.5-gigabit Ethernet (2.5GbE) ports. They use them as a key selling point, hoping that the big number will entice people to buy their wares.
But, as ever, it isn’t quite that simple. These routers often only have a single 2.5GbE port, and that rarely translates into any real-world performance boost for the majority of home router buyers. But that isn’t to say that 2.5GbE is a scam; you just need to know what you’re getting into before you part with your hard-earned cash.
The single-port trap
Beware internal bottlenecks
The biggest issue when buying a new router with multi-gig claims is its overall hardware layout. Router manufacturers have become accustomed to advertising 2.5GbE connectivity, but that’s only half of the story. You have to look closely at the spec sheet to understand what is going on: the router has only a single 2.5GbE port. The rest use standard gigabit Ethernet.
By offering a single 2.5GbE port, routers create an immediate bottleneck. That port usually connects to the modem, so your new router can make full use of multi-gig broadband connections. But any device that connects to your router remains limited to single-gigabit speeds because it connects via standard gigabit Ethernet ports. No single device will ever benefit from that 2.5GbE connection as a result.
This will no doubt disappoint anyone who sees the marketing of 2.5GbE and expects all their devices to transfer files at multi-gig speeds. They simply will not.
Wireless bandwidth limits and real-world performance
Remember Wi-Fi overheads
One argument for routers with a single 2.5GbE port has long been that it allows multiple Wi-Fi-connected devices to make full use of a multi-gig broadband connection. With multiple devices connected via Wi-Fi, a 2.5GbE port allows them to take full advantage of the available bandwidth in aggregate.
However, while that does make sense on the face of it, it’s important to remember that Wi-Fi physics limit the reality of such an approach.
The Wi-Fi speeds published with regard to routers are theoretical combined figures across all available bands. But real-world performance is heavily reduced by environmental obstructions, distance, and wireless protocol overheads.
With that in mind, it’s unlikely that most home routers will ever be able to serve devices with enough bandwidth that a 2.5GbE connection will be saturated — even when aggregated. Furthermore, it’s important to remember that the average home broadband plan is well below gigabit, let alone 2.5GbE. Most people are likely connecting a 2.5GbE port to a sub-gigabit broadband plan, which, of course, makes little sense.
When 2.5GbE actually makes sense
It isn’t all bad news
That said, 2.5GbE still makes sense in some home network settings. But usually only when that home network is bordering on the prosumer side of things.
Where 2.5GbE really makes the most sense is when the router has multiple ports capable of that speed. We’ve already discussed routers that only have a single port rated for 2.5-gigabit that’s used solely for connecting to a multi-gig modem. But the biggest and best routers also have 2.5GbE ports that can be connected to high-bandwidth devices, like media servers, around the home.
Of course, devices also need to have ports of their own that are rated for at least 2.5-gigabit connections for any of this to matter. And any switches between the router and those devices will also have 2.5GbE ports, too. Remember, a network is only as fast as its slowest link, so you may need to retool your entire network to get the best out of those 2.5GbE ports.
Homes where this might make sense include those with busy, high-bandwidth home servers (again, media servers are obvious contenders) or those with multi-gig broadband connections.
However, none of this applies to most homes and most home networks. If it applies to you and yours, I’d wager that you already know full well how fast all of your devices are talking to one another.
Don’t pay for half a feature
Unless you can make full use of it
All of this is to say that, for the majority, a router with a 2.5GbE port simply isn’t required. It’s overkill, and its full capability will be wasted on devices and network connections that can’t make use of it.
But that isn’t going to stop router makers from waxing poetic about their 2.5GbE ports, and it’s vital to understand what those ports do and how you can make use of them. Most people don’t need those ports, but some people do. If that’s you, I’d recommend making sure your next router has plenty of them, not just one.